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学者姓名：陈子勇
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Abstract ：
Al-Zn-Mg-Cu aluminum alloys have the advantages of high specific strength, easy processing, and high toughness, showing great potential application in the aerospace field. However, ultra-high strength aluminum alloys usually contain coarse microstructures, micro-segregation, and casting defects that seriously deteriorate mechanical properties. Here, we report a high-strength aluminum alloy (Al-10.5Zn-2.0Mg-1.2Cu-0.12Zr-0.1Er) prepared by rapid solidification and hot extrusion to explore the microstructure modification of the alloy based on this strategy. The results show that: rapid-solidification technology can significantly refine alloy grains, alloy ribbons were composed of alpha (Al) equiaxed fine grains, and the average grain size was less than 6 mu m. After extrusion, the alloy had partially recrystallized, existing coarse second-phase (T-phase) and needle-shaped precipitates were MgZn2 (eta-phase), and the tensile strength and elongation of the extruded bar were 466.4 MPa and 12.9%, respectively. After T6 heat treatment, the tensile strength of the alloy reached 635.8 MPa, while elongation decreased to 10.5%. According to microstructure analysis and considering the contributions of grain boundary, dislocation, and precipitation-strengthening to the improvement of the mechanical properties, it was found that precipitation-strengthening is the main strengthening mechanism. Our research shows that rapid-solidification and hot-extrusion technology have great potential for improving the microstructures and mechanical properties of aluminum alloys.
Keyword ：
extrusion extrusion rapid solidification rapid solidification microstructure microstructure Al-Zn-Mg-Cu alloy Al-Zn-Mg-Cu alloy mechanical property mechanical property
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| GB/T 7714 | Shen, Gaoliang , Xiang, Zhilei , Ma, Xiaozhao et al. Investigation of Microstructures and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy Prepared by Rapid Solidification and Hot Extrusion [J]. | METALS , 2023 , 13 (2) . |
| MLA | Shen, Gaoliang et al. "Investigation of Microstructures and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy Prepared by Rapid Solidification and Hot Extrusion" . | METALS 13 . 2 (2023) . |
| APA | Shen, Gaoliang , Xiang, Zhilei , Ma, Xiaozhao , Huang, Jingcun , Zhao, Yueqing , Li, Jihao et al. Investigation of Microstructures and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy Prepared by Rapid Solidification and Hot Extrusion . | METALS , 2023 , 13 (2) . |
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Abstract ：
Nanocrystalline (NC) structure can lead to the considerable strengthening of metals and alloys. Obtaining appropriate comprehensive mechanical properties is always the goal of metallic materials. Here, a nanostructured Al-Zn-Mg-Cu-Zr-Sc alloy was successfully processed by high-pressure torsion (HPT) followed by natural aging. The microstructures and mechanical properties of the naturally aged HPT alloy were analyzed. The results show that the naturally aged HPT alloy primarily consists of nanoscale grains (similar to 98.8 nm), nano-sized precipitates (20-28 nm in size), and dislocations (1.16 x 10(15) m(-2)), and exhibits a high tensile strength of 851 & PLUSMN; 6 MPa and appropriate elongation of 6.8 & PLUSMN; 0.2%. In addition, the multiple strengthening modes that were activated and contributed to the yield strength of the alloy were evaluated according to grain refinement strengthening, precipitation strengthening, and dislocation strengthening, and it is shown that grain refinement strengthening and precipitation strengthening are the main strengthening mechanisms. The results of this study provide an effective pathway for achieving the optimal strength-ductility match of materials and guiding the subsequent annealing treatment.
Keyword ：
high-pressure torsion high-pressure torsion Al-Zn-Mg-Cu-Zr-Sc alloy Al-Zn-Mg-Cu-Zr-Sc alloy mechanical properties mechanical properties microstructure microstructure natural aging natural aging
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| GB/T 7714 | Shen, Gaoliang , Xiang, Zhilei , Ma, Xiaozhao et al. Microstructures and Mechanical Properties of a Nanostructured Al-Zn-Mg-Cu-Zr-Sc Alloy under Natural Aging [J]. | MATERIALS , 2023 , 16 (12) . |
| MLA | Shen, Gaoliang et al. "Microstructures and Mechanical Properties of a Nanostructured Al-Zn-Mg-Cu-Zr-Sc Alloy under Natural Aging" . | MATERIALS 16 . 12 (2023) . |
| APA | Shen, Gaoliang , Xiang, Zhilei , Ma, Xiaozhao , Huang, Jingcun , Li, Jihao , Wang, Bing et al. Microstructures and Mechanical Properties of a Nanostructured Al-Zn-Mg-Cu-Zr-Sc Alloy under Natural Aging . | MATERIALS , 2023 , 16 (12) . |
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Abstract ：
Near-alpha titanium alloys are widely used in aeroengine blades due to their excellent specific strength and mechanical properties. The mechanical properties of near-a titanium alloys are closely related to the evolution of the microstructure and precipitates. In this paper, the microstructure and mechanical properties of a new type of multi-component near-a titanium alloy sheet after rolling, 700 ? aging, and 800 ? aging were studied. The results show that the strength of the alloy after aging at 700 ? increases from 1156 MPa to 1304 MPa, respectively, but decreases to 1246 MPa with the aging temperature increasing. The ductility of the alloy aged at 700 ? is lower than that of the rolled state, but the ductility increases slightly with the aging temperature increasing. The effect of aging heat treatment on the microstructure and precipitation behavior of alloy plates has been studied and compared with alloys before aging. After heat treatment, the content of primary a decreases from 25% to 5%, respectively. Two kinds of silicide precipitate at different positions, with the large-size spherical silicide being (Ti, Zr, Nb)(5)Si-3, and the small-size fusiform silicide being (Ti, Zr, Nb)(6)Si-3, respectively. Ti3Al was precipitated in the primary a phase, during the aging process. The silicides exhibit the strengthening effect on the alloy, but the effect weakens when the silicides grow up. The loss in ductility is mainly attributed to the precipitation of the a(2) phase after aging treatment. However, ductility is improved after applying higher aging temperatures as the size of the a(2) phase becomes smaller, and the distribution of them tends to become dispersed.
Keyword ：
& alpha;(2) phase & alpha;(2) phase silicides silicides high-temperature titanium alloy high-temperature titanium alloy microstructure microstructure heat treatment heat treatment near-& alpha near-& alpha
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| GB/T 7714 | Han, Jingyu , Xiang, Zhilei , Ma, Xiaozhao et al. Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments [J]. | METALS , 2023 , 13 (7) . |
| MLA | Han, Jingyu et al. "Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments" . | METALS 13 . 7 (2023) . |
| APA | Han, Jingyu , Xiang, Zhilei , Ma, Xiaozhao , Zhou, Zongyi , Huang, Jingcun , Li, Jihao et al. Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments . | METALS , 2023 , 13 (7) . |
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Abstract ：
Evolution laws of microstructures, mechanical properties, and fractographs after different solution temperatures were investigated through various analysis methods. With the increasing solution temperatures, contents of the primary alpha phase decreased, and contents of transformed beta structures increased. Lamellar alpha grains dominated the characteristics of transformed beta structures, and widths of secondary alpha lamellas increased monotonously. For as-forged alloy, large silicides with equiaxed and rod-like morphologies, and nano-scale silicides were found. Silicides with large sizes might be (Ti, Zr, Nb)(5)Si-3 and (Ti, Zr, Nb)(6)Si-3. Rod-like silicides with small sizes precipitated in retained beta phase, exhibiting near 45 degrees angles with alpha/beta boundaries. Retained beta phases in as-heat treated alloys were incontinuous. 980STA exhibited an excellent combination of room temperature (RT) and 650 degrees C mechanical properties. Characteristics of fracture surfaces largely depended on the evolutions of microstructures. Meanwhile, silicides promoted the formation of mico-voids.
Keyword ：
solution temperatures solution temperatures microstructures microstructures mechanical properties mechanical properties fractographs fractographs silicides silicides
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| GB/T 7714 | Ma, Xiaozhao , Xiang, Zhilei , Li, Tao et al. Evolution laws of microstructures and mechanical properties during heat treatments for near-alpha high-temperature titanium alloys [J]. | INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS , 2022 , 29 (8) : 1596-1607 . |
| MLA | Ma, Xiaozhao et al. "Evolution laws of microstructures and mechanical properties during heat treatments for near-alpha high-temperature titanium alloys" . | INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS 29 . 8 (2022) : 1596-1607 . |
| APA | Ma, Xiaozhao , Xiang, Zhilei , Li, Tao , Chen, Yilan , Liu, Yingying , Chen, Ziyong et al. Evolution laws of microstructures and mechanical properties during heat treatments for near-alpha high-temperature titanium alloys . | INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS , 2022 , 29 (8) , 1596-1607 . |
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Abstract ：
研究了B和Y对Ti45Al8Nb0.2W0.25Cr (at%)合金的微观结构、微观偏析和拉伸行为的影响。结果表明,高铌Ti Al合金中的β相稳定元素促进了微观偏析区域中γ相以及大块状微观偏析区域的形成。具有低比表面积的大块状微偏析区域降低了微偏析界面处的空洞和裂纹的成核率,明显降低了晶界处的强度和合金的抗拉强度。B和Y的添加明显的细化了片层团,增加了片层团处空洞成核的机会,从而提高了变形抗力。分析了2种合金的拉伸机理。
Keyword ：
TiAl TiAl 微观偏析 微观偏析 组织 组织 拉伸 拉伸
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| GB/T 7714 | 宫子琪 , 武晋 , 孙伟 et al. B和Y对高铌TiAl合金组织和拉伸性能的影响（英文） [J]. | 稀有金属材料与工程 , 2021 , 50 (08) : 2760-2764 . |
| MLA | 宫子琪 et al. "B和Y对高铌TiAl合金组织和拉伸性能的影响（英文）" . | 稀有金属材料与工程 50 . 08 (2021) : 2760-2764 . |
| APA | 宫子琪 , 武晋 , 孙伟 , 陈子勇 , 聂祚仁 . B和Y对高铌TiAl合金组织和拉伸性能的影响（英文） . | 稀有金属材料与工程 , 2021 , 50 (08) , 2760-2764 . |
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Abstract ：
TiB2 particles clusters evolution, mechanical properties and strengthening mechanisms of in situ 6wt% TiB2/Al-Zn-Mg-Cu composites subjected by two-step deformation process were studied. The results suggest that large TiB2 clusters and belts can hinder elements dissolution and diffusion, leading to partial transformation from T phase to S phase. Two-step orthogonal deformation can effectively break the TiB2 clusters to release the wrapped phases, which is conductive to solution process. Low fraction of residual T and S phases, broken brittle phases and uniform TiB2 distribution are in favor of mechanical properties. In T6 state, eta' and GP II are the main reinforcement phases, which can contribute to yield strength about 355.30 MPa estimated by strengthening model, dislocation reinforcement contribution is about 112.70 MPa. The 6wt% TiB2/Al-Zn-Mg-Cu composite subjected two-step deformation owns an excellent mechanical performance, 616.96 MPa (UTS), 552.00 MPa (YS), 9.67% (EL). Comparably, UTS, YS and EL of that improve by 16%, 15%, 265% in radial direction and 12%, 18%, 87% in axial direction than forged composite.
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| GB/T 7714 | Huang, Jingcun , Xiang, Zhilei , Li, Jihao et al. Effect on microstructure and mechanical properties of in situ 6 wt%TiB2/Al-Zn-Mg-Cu composite subjected by two-step orthogonal deformation process [J]. | JOURNAL OF MATERIALS RESEARCH , 2021 , 36 (21) : 4426-4437 . |
| MLA | Huang, Jingcun et al. "Effect on microstructure and mechanical properties of in situ 6 wt%TiB2/Al-Zn-Mg-Cu composite subjected by two-step orthogonal deformation process" . | JOURNAL OF MATERIALS RESEARCH 36 . 21 (2021) : 4426-4437 . |
| APA | Huang, Jingcun , Xiang, Zhilei , Li, Jihao , Ma, Xiaozhao , Yang, Zian , Shen, Gaoliang et al. Effect on microstructure and mechanical properties of in situ 6 wt%TiB2/Al-Zn-Mg-Cu composite subjected by two-step orthogonal deformation process . | JOURNAL OF MATERIALS RESEARCH , 2021 , 36 (21) , 4426-4437 . |
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Abstract ：
Ti-6.5Al-2.5Sn-9Zr-0.5Mo-0.25Si-1Nb-1W-0.1Er-xB (x = 0, 0.1, 0.2, 0.4, 0.6 and 0.8 wt%) with different boron contents are fabricated for investigation. Influences of boron element and its amounts on phase constitutions, microstructures, textures and compression mechanical properties are carefully studied. With the increasing boron additions, contents of TiB phase increase, and the maximum intensities of textures decrease. Microstructures are significantly and continuously refined after adding boron element and with the increasing boron additions, and turning point of refinement rates for different microstructural parameters is found at 0.2 wt% boron content. Strengths increase monotonously, while elongations increase firstly and decrease afterwards. The maximum value of elongation is acquired at boron content of 0.2 wt%. On the premise of ensuring plasticity, 0.2 wt% boron content is the most appropriate amount for microstructural refinement and mechanical properties enhancement for current near alpha titanium alloys. Meanwhile, aspect ratios of TiB whiskers increase with the increasing boron contents. Lots of near equiaxed alpha grains or alpha grains with irregular morphologies are discovered around TiB phase. Distorted and twisted alpha grain boundaries are also obviously detected in boron containing alloys. Moreover, premature fracture of alloys containing TiB whiskers is largely influenced by the fracture of these brittle reinforcements. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword ：
Fracture behaviors Fracture behaviors Near alpha titanium alloy Near alpha titanium alloy Boron element Boron element Textures Textures Microstructures Microstructures Mechanical properties Mechanical properties
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| GB/T 7714 | Ma, Xiaozhao , Xiang, Zhilei , Tan, Chao et al. Influences of boron contents on microstructures and mechanical properties of as-casted near alpha titanium alloy [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 77 : 1-18 . |
| MLA | Ma, Xiaozhao et al. "Influences of boron contents on microstructures and mechanical properties of as-casted near alpha titanium alloy" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 77 (2021) : 1-18 . |
| APA | Ma, Xiaozhao , Xiang, Zhilei , Tan, Chao , Wang, Zhitian , Liu, Yingying , Chen, Ziyong et al. Influences of boron contents on microstructures and mechanical properties of as-casted near alpha titanium alloy . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 77 , 1-18 . |
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Abstract ：
The influence of B and Y on the microstructure, microsegregation, and tensile behaviour of the Ti45A18Nb0.2W0.25Cr (at%) alloy was investigated. The beta-stabilizer elements in the high-Nb TiAl alloy promote the formation of the gamma phase in the microsegregation region and lead to the formation of large blocky microsegregation areas. The large blocky microsegregation regions with low specific surface areas reduce the nucleation rate of cavities and cracks at the interfaces of the microsegregation, which are harmful to colony boundary strengthening and decrease tensile resistance. The addition of B and Y affords an obvious refinement in the lamellar colony, renders an increasing opportunity for cavity nucleation at the colony boundary, and thus improves the tensile resistance. The tensile mechanisms of the alloys before and after (B, Y) addition were also compared and analysed.
Keyword ：
TiAl TiAl microstructure microstructure microsegregation microsegregation tension tension
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| GB/T 7714 | Gong Ziqi , Wu Jin , Sun Wei et al. Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys [J]. | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (8) : 2760-2764 . |
| MLA | Gong Ziqi et al. "Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys" . | RARE METAL MATERIALS AND ENGINEERING 50 . 8 (2021) : 2760-2764 . |
| APA | Gong Ziqi , Wu Jin , Sun Wei , Chen Ziyong , Nie Zuoren . Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys . | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (8) , 2760-2764 . |
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Abstract ：
2D forging processes are adopted to tailor the microstructures and mechanical properties of near ? titanium alloys with different boron contents and the evolutions of the microstructures and mechanical properties of the acquired alloys are carefully characterised. Maximum texture intensities decrease with increasing boron contents, thereby illustrating the improvements in the homogeneity of the microstructures. The distribution of TiB whiskers in the 3D space exhibits a near-columnar arrangement around boundaries of squashed and elongated prior 13 grains along the stretching direction. Increases in the contents of equiaxed ? grains with increasing TiB contents are ascribed to enhancements in recrystallisation due to the promotion effects of the TiB phase and increases in 13 transus temperatures. Boron exhibits excellent refinement effects on the alloy matrices, and the refinement degree increases with increasing boron contents. The proportions of low-angle grain boundaries decrease whilst the corresponding proportions of high-angle grain boundaries increase with increasing boron contents. The ultimate and yield strengths of the alloys increase at room temperature (RT) and 650 ?C. Elongations exhibit a decreasing trend at RT but are maintained at 650 ?C. At RT, cleavage fractures of the TiB whiskers determine the evolution law of elongation. The fracture characteristics of alloy matrices exhibit a transformation from a mixture of tearing lamellae and dimples to dimples only. At 650 ?C, the alloy matrices are characterised by ductile fractures with numerous dimples. Er containing particles facilitate the fracture of alloy through cooperative effects with TiB whiskers.
Keyword ：
2D forging Textures Mechanical properties Fracture behaviors Er containing particles 2D forging Textures Mechanical properties Fracture behaviors Er containing particles
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| GB/T 7714 | Ma, Xiaozhao , Xiang, Zhilei , Li, Jihao et al. Influence of 2D forging processes and boron contents on the microstructures and mechanical properties of near ? titanium alloys [J]. | INTERMETALLICS , 2021 , 133 . |
| MLA | Ma, Xiaozhao et al. "Influence of 2D forging processes and boron contents on the microstructures and mechanical properties of near ? titanium alloys" . | INTERMETALLICS 133 (2021) . |
| APA | Ma, Xiaozhao , Xiang, Zhilei , Li, Jihao , Chen, Ziyong , Shu, Qun . Influence of 2D forging processes and boron contents on the microstructures and mechanical properties of near ? titanium alloys . | INTERMETALLICS , 2021 , 133 . |
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Abstract ：
B-containing high temperature titanium alloys were in situ fabricated successfully by casting route. The influences of heat treatment processes on the evolution of microstructures, textures, strengths, elongations and fracture characteristics at room temperature (RT) and high temperature (650 degrees C) were analyzed. Microstructure investigation revealed that TiB whiskers stimulated the dynamic recrystallization behavior. The volume fractions of primary alpha phase (V-P alpha) decreased with the increasing solution temperature, while the volume fractions of transformed beta phase (V-T beta) and widths of secondary alpha lamellas in transformed beta phase (W-S alpha) increased. The inverse pole figures (IPFs) observations illustrated nea-requiaxed alpha grains transformed to ideal equiaxed morphology after 960 degrees C solution. By the analyzation of pole figues (PFs), after alpha+beta heat treatments, the overall texture intensity increased with the increasing solution temperature, and after beta heat treatments, textures with comparatively high intensities were concentrated around various directions. The equiaxed alpha grains and lamellar alpha phase had similar main texture components. But the maximum texture intensity of lamellar alpha phase was obviously higher than that of equiaxed alpha grains. Moreover, the textures of equiaxed alpha gains and lamellar alpha phase exhibited higher similarity after 980 degrees C solution comparing with after 960 degrees C solution. Alloy after 980 degrees C solution exhibited an excellent combination of RT and 650 degrees C mechanical properties which was ascribed to the microstructure tailoring and the load-sharing effect of TiB whiskers. Fracture of alloys was due to the debonding of TiB whiskers, and the growth and coalescence of micro-voids in matrix and around the cracks of fractured TiB whiskers. (C) 2019 Elsevier B.V. All rights reserved.
Keyword ：
Heat treatment Heat treatment Microstructure Microstructure Fracture characteristic Fracture characteristic Tensile properties Tensile properties Texture Texture B-containing titanium alloy B-containing titanium alloy
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| GB/T 7714 | Ma, X. Z. , Chai, L. H. , Liu, Y. Y. et al. TiB whiskers stimulated the dynamic recrystallization behavior [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2020 , 812 . |
| MLA | Ma, X. Z. et al. "TiB whiskers stimulated the dynamic recrystallization behavior" . | JOURNAL OF ALLOYS AND COMPOUNDS 812 (2020) . |
| APA | Ma, X. Z. , Chai, L. H. , Liu, Y. Y. , Cui, Y. P. , Shen, G. L. , Zhang, C. J. et al. TiB whiskers stimulated the dynamic recrystallization behavior . | JOURNAL OF ALLOYS AND COMPOUNDS , 2020 , 812 . |
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