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学者姓名：高坤元
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Abstract ：
The Al-Mn alloy heat exchanger fin production process includes a brazing treatment at s high temperature of 600 degrees C, in which coarse grains are preferred for their high resistance to deformation at elevated temperatures by decreasing the grain boundary sliding. In this study, Al-1.57Mn-1.57Zn-0.58Si-0.17Fe alloy foils cold rolled by 81.7% (1.1 mm in thickness) and 96.5% (0.21 mm in thickness) were annealed at 100-550 degrees C for 1 h to investigate their recrystallization behavior, grain sizes, and precipitates by increasing the annealing temperature, using micro-hardness measurement, electron back-scattered diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The micro-hardness results showed that the recrystallization finishing temperatures for the two samples were almost the same, 323 +/- 2 degrees C. The EBSD results showed that when the annealing temperature decreased from 550 to 400 degrees C, the recrystallized grain sizes of the two samples were nearly identical-both increased slightly. Further decreasing the annealing temperature from 400 to 330 degrees C caused the grain sizes to increase more, with the thinner foil sample having a more significant increase. The SEM and TEM observations showed that the micron-sized primary-phase remained unchanged during the annealing process. The nano-sized secondary phase precipitates formed during the hot-rolling process experienced a coarsening and dissolving process upon annealing. The particle size of the secondary phase increased from 32 nm to 44 nm and the area fraction decreased from 4.2% to 3.8%. The nucleation analysis confirmed that the large primary-phase could act as a nucleation site through particle stimulated nucleation (PSN) mode. The relatively dense secondary phase precipitates with small sizes at lower temperatures could provide higher Zener drag to the grain boundaries, leading to fewer nuclei and thereafter coarser grains. The coarsening of the recrystallized grains in the foils could be implemented through thickness reduction and/or precipitation processes to form densely distributed nano-sized precipitates.
Keyword ：
recrystallization recrystallization particle stimulated nucleation particle stimulated nucleation Zener drag Zener drag Al-Mn alloys Al-Mn alloys grain size grain size
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| GB/T 7714 | Wang, Jianzhu , Gao, Kunyuan , Xiong, Xiangyuan et al. The Influence of Precipitated Particles on the Grain Size in Cold-Rolled Al-Mn Alloy Foils upon Annealing at 100-550 °C [J]. | MATERIALS , 2024 , 17 (7) . |
| MLA | Wang, Jianzhu et al. "The Influence of Precipitated Particles on the Grain Size in Cold-Rolled Al-Mn Alloy Foils upon Annealing at 100-550 °C" . | MATERIALS 17 . 7 (2024) . |
| APA | Wang, Jianzhu , Gao, Kunyuan , Xiong, Xiangyuan , Zhang, Yue , Ding, Yusheng , Wang, Jingtao et al. The Influence of Precipitated Particles on the Grain Size in Cold-Rolled Al-Mn Alloy Foils upon Annealing at 100-550 °C . | MATERIALS , 2024 , 17 (7) . |
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Abstract ：
The influence of grain size on the corrosion behavior of pure aluminum and the defect density and diffusion coefficient of surface passive films were investigated using electron backscatter diffraction (EBSD) and electrochemical testing techniques, based on the point defect model (PDM). Samples with three different grain sizes (23 +/- 11, 134 +/- 52, and 462 +/- 203 mu m) were obtained by annealing at different temperatures and times. The polarization curves and electrochemical impedance spectroscopy results for the pure aluminum in the 3.5% NaCl solution showed that with decreasing grain size, the corrosion current (icorr) decreased monotonously, giving rise to a noble corrosion potential and a large polarization resistance. The Motte-Schottky results showed that the passive films that formed on pure aluminum with fine grains of 23 +/- 11 mu m had a low density (3.82 x 1020 cm-3) of point defects, such as oxygen vacancies and/or metal interstitials, and a small diffusion coefficient (1.94 x 10-17 cm2/s). The influence of grain size on corrosion resistance was discussed. This work demonstrated that grain refinement could be an effective approach to achieving high corrosion resistance of passive metals.
Keyword ：
pure aluminum pure aluminum formation potential formation potential grain size grain size diffusion coefficient diffusion coefficient passive film passive film
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| GB/T 7714 | Hu, Xiuhua , Gao, Kunyuan , Xiong, Xiangyuan et al. Influence of Grain Size and Film Formation Potential on the Diffusivity of Point Defects in the Passive Film of Pure Aluminum in NaCl Solution [J]. | METALS , 2024 , 14 (7) . |
| MLA | Hu, Xiuhua et al. "Influence of Grain Size and Film Formation Potential on the Diffusivity of Point Defects in the Passive Film of Pure Aluminum in NaCl Solution" . | METALS 14 . 7 (2024) . |
| APA | Hu, Xiuhua , Gao, Kunyuan , Xiong, Xiangyuan , Huang, Hui , Wu, Xiaolan , Wen, Shengping et al. Influence of Grain Size and Film Formation Potential on the Diffusivity of Point Defects in the Passive Film of Pure Aluminum in NaCl Solution . | METALS , 2024 , 14 (7) . |
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Abstract ：
Upon 98% reduction cold-rolling, a single layer AA3003 foil material of 115 mu m thick was intermediately annealed at 300-420 degrees C/1-8 h, and the preferred temperature and time of the intermediate annealing for the laminated AA4343/AA3003/AA4343 composite foil material were determined. All of these samples were cold rolled by 40% to 70 mu m thick and finally annealed at a temperature in the range of 300-550 degrees C for 1-9 h. Their sagging resistance and microstructure were investigated using simulated brazing treatment, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For the single layer AA3003 foil, the sagging distance decreased first and then increased with increasing intermediate annealing temperature, and the lowest sagging distance corresponds to the coarsest grain in the recrystallized sample. After the final annealing for the single layer, the sagging distance decreased monotonously. For the laminated foil subjected to the final annealing, the sagging distance curves decreased first and then increased with increasing annealing temperature and time. The improvement of sagging resistance was attributed to the recovery of two types of materials during annealing process. The deterioration of the sagging resistance in the laminated foils was due to the corrosion in the brazing process, resulted from the Si diffusion from the cladding layer into the core layer. It is the coarse grains, few dislocations and minimal diffusion of Si that are crucial for improving the sagging resistance of the laminated foils.
Keyword ：
Laminated composite foil Laminated composite foil Aluminum alloy Aluminum alloy Corrosion Corrosion Sagging resistance Sagging resistance Annealing process Annealing process
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| GB/T 7714 | Wang, Jianzhu , Gao, Kunyuan , Xiong, Xiangyuan et al. The influence of annealing process on the sagging resistance of AA3003 foil and laminated AA4343/AA3003/AA4343 composite foil materials [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 32 : 3573-3581 . |
| MLA | Wang, Jianzhu et al. "The influence of annealing process on the sagging resistance of AA3003 foil and laminated AA4343/AA3003/AA4343 composite foil materials" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 32 (2024) : 3573-3581 . |
| APA | Wang, Jianzhu , Gao, Kunyuan , Xiong, Xiangyuan , Zhang, Yue , Ding, Yusheng , Wu, Xiaolan et al. The influence of annealing process on the sagging resistance of AA3003 foil and laminated AA4343/AA3003/AA4343 composite foil materials . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 32 , 3573-3581 . |
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Abstract ：
The effects of a minor Zn addition on the mechanical and corrosion properties and microstructure of a high Mg content AlMg alloy containing Er and Zr in the warm-rolled state were studied using tensile test, nitric acid mass loss test (NAMLT), exfoliation corrosion susceptibility test (ASSET), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The tensile test results showed that the 0.58 wt% Zn addition to the Al-Mg-Er-Zr alloy increased the yield strength from 297 to 351 MPa and tensile strength from 416 to 445 MPa, but decreased the elongation from 13.3 % to 12.5 %. The NAMLT and ASSET results showed that the two warm rolled alloys were initially in the stabilization state, but the Al-Mg-Er-Zr alloy without Zn added became sensitized severely after the accelerated sensitization annealing (ASA) at 100 degrees C. The Zn addition improved the intergranular corrosion (IGC) resistance and exfoliation corrosion (EC) resistance significantly. The TEM results showed that, for the Al-Mg-Er-Zr alloy, there were Al-3(Er,Zr) phase particles in the matrix and beta (Al3Mg2) phase particles separated from each other at the grain boundary. After the ASA treatment, more beta phase particles were precipitated and covered the grain boundary completely. For the Al-Mg-Zn-Er- Zr alloy, another nanoscale T (Al-32(Mg, Zn)(49)) phase was precipitated in the matrix, and there were no grain boundary phase particles observed at the grain boundary, because the precipitation of T phase consumed the supersaturated Mg in the matrix, thus suppressing the formation of grain boundary phase particles during the ASA treatment and resulting in a good corrosion resistance. The strengthening effect of the Zn addition was mainly due to the formation of T phase particles during the warm rolling process.
Keyword ：
Microalloying Microalloying Mechanical property Mechanical property Aluminum-magnesium alloy Aluminum-magnesium alloy Corrosion property Corrosion property Microstructure Microstructure
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| GB/T 7714 | Wang, Jianzhu , Gao, Kunyuan , Xiong, Xiangyuan et al. The influence of Zn addition on the microstructure and mechanical and corrosion properties of warm rolled Al-Mg alloys containing Er and Zr [J]. | MATERIALS CHARACTERIZATION , 2024 , 217 . |
| MLA | Wang, Jianzhu et al. "The influence of Zn addition on the microstructure and mechanical and corrosion properties of warm rolled Al-Mg alloys containing Er and Zr" . | MATERIALS CHARACTERIZATION 217 (2024) . |
| APA | Wang, Jianzhu , Gao, Kunyuan , Xiong, Xiangyuan , Li, Lin , Wu, Xiaolan , Wen, Shengping et al. The influence of Zn addition on the microstructure and mechanical and corrosion properties of warm rolled Al-Mg alloys containing Er and Zr . | MATERIALS CHARACTERIZATION , 2024 , 217 . |
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Abstract ：
针对5E83合金(Er、Zr微合金化5083合金),采用超塑性拉伸试验、扫描电镜(SEM)、电子背散射衍射(EBSD)和透射电镜(TEM),探究了Er、Zr微合金元素、晶粒尺寸、变形温度、应变速率对合金超塑性的影响。通过再结晶退火、空冷和水冷的搅拌摩擦加工(FSP),分别获得了晶粒尺寸为7.4、5.2、3.4μm的完全再结晶组织，作为初始状态进行超塑性拉伸。结果表明，初始晶粒尺寸越细小，超塑性伸长率越高。当晶粒尺寸>5μm时，超塑性变形过程晶粒粗化缓慢，细化初始晶粒可显著提高超塑性；而当晶粒尺寸<5μm时，超塑性变形过程晶粒粗化严重，进一步细化初始晶粒对超塑性的提高有限。不同变形温度、应变速率的超塑性拉伸结果显示在变形温度为450～540℃、应变速率为1.67×10~(-4)～1.67×10~(-1) s~(-1),超塑性伸长率随变形温度和应变速率的提高呈现先上升后下降再上升的趋势；变形温度为520℃、应变速率为1.67×10~(-3) s~(-1)条件下，水冷FSP态合金获得最大伸长率330%,对应的超塑性变形机理主要是晶界滑移。相比于5083合金，Er、Zr的添加显著提高了超塑性，这主要是由于Er、Zr在Al基体中形成了纳米级弥散的Al_3(Er, Zr)相，在超塑性拉伸时能够钉扎晶界，阻碍晶界迁移，在晶粒尺寸>5μm时，有效地抑制了晶粒长大，从而提高了超塑性。
Keyword ：
微合金化 微合金化 微观结构 微观结构 超塑性 超塑性 5E83铝合金 5E83铝合金
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| GB/T 7714 | 王博 , 高坤元 , 丁宇升 et al. Er、Zr微合金化5083铝合金的超塑性 [J]. | 金属热处理 , 2023 , 48 (04) : 178-183 . |
| MLA | 王博 et al. "Er、Zr微合金化5083铝合金的超塑性" . | 金属热处理 48 . 04 (2023) : 178-183 . |
| APA | 王博 , 高坤元 , 丁宇升 , 文胜平 , 黄晖 , 吴晓蓝 et al. Er、Zr微合金化5083铝合金的超塑性 . | 金属热处理 , 2023 , 48 (04) , 178-183 . |
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Abstract ：
选用3 mm厚冷轧态高纯铝板和退火态高纯铁板作为焊接母材,使用300/400/500/600 r/min-100 mm/min和300 r/min-80/60 mm/min焊接参数进行铝/铁异种金属搅拌摩擦焊对接焊试验.对焊接接头进行显微硬度和拉伸性能测试,通过扫描电镜(SEM)、能谱仪(EDS)、电子背散射衍射(EBSD)等对接头组织进行表征.焊缝宏观形貌观察发现,焊缝的正面和背面有孔洞,正面出现毛刺.随着转速焊速比增加,孔洞消失毛刺增加.拉伸试验结果显示,共出现3种失效模式,分别为在300 r/min-100 mm/min参数下孔洞缺陷处断裂,300 r/min-80/60 mm/min参数下Al/Fe界面断裂和400/500/600 r/min-100 mm/min处Al侧基体断裂,3种模式下的最大焊接效率分别为40.1％、41.0％和60.4％,其中Al侧基体断裂模式的焊接效率最高.出现在焊核区的孔洞降低了接头强度,导致了缺陷断裂;在300 r/min低转速下,界面未达到有效的冶金结合,界面强度低于Al基体强度,导致Al/Fe界面断裂.硬度试验结果显示,铝侧硬度呈现先下降后上升趋势,硬度最低点出现在距离铝铁界面6～7 mm的热影响区,与Al侧基体断裂位置相对应,随着转速提高,界面强度高于Al侧热影响区的强度,导致了 Al侧基体断裂.
Keyword ：
冶金结合 冶金结合 失效模式 失效模式 搅拌摩擦焊 搅拌摩擦焊 力学性能 力学性能 铝/铁异种金属 铝/铁异种金属
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| GB/T 7714 | 裴瑜 , 高坤元 , 张小军 et al. 纯铝纯铁搅拌摩擦焊接头的组织与力学性能 [J]. | 金属热处理 , 2023 , 48 (2) : 36-43 . |
| MLA | 裴瑜 et al. "纯铝纯铁搅拌摩擦焊接头的组织与力学性能" . | 金属热处理 48 . 2 (2023) : 36-43 . |
| APA | 裴瑜 , 高坤元 , 张小军 , 黄晖 , 吴晓蓝 , 文胜平 et al. 纯铝纯铁搅拌摩擦焊接头的组织与力学性能 . | 金属热处理 , 2023 , 48 (2) , 36-43 . |
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Abstract ：
通过SEM、EDS、DSC、XRD等测试手段研究了 Al-2.4Cu-1.3Li-(Yb)合金铸态及均匀化过程中组织及微观结构演变.SEM观察显示,铸态组织中存在明显的枝晶偏析,枝晶间距为45±6 μm(Al-Cu-Li合金)与43±7 μm(Al-Cu-Li-Yb合金),一次相形貌为块状或条状,面积占比为2.8％(Al-Cu-Li合金)与2.2％(Al-Cu-Li-Yb合金),EDS和XRD结果显示其主要成分为多种AlCu(Li)相,Al-Cu-Li-Yb合金中还存在少量Al8Cu4Yb相.根据DSC测试与均匀化动力学计算,制定均匀化退火工艺为500℃×12 hoSEM观察显示退火后样品枝晶偏析已经消除,残留一次相为聚集球状AlCuFe相和/或骨骼状Al8Cu4Yb相,面积占比下降到0.93％(Al-Cu-Li合金)和0.76％(Al-Cu-Li-Yb合金).为了使Yb进一步回溶,针对Al-Cu-Li-Yb合金制定二级均匀化工艺为500℃×12 h+530℃×12 h,残留一次相面积占比下降到0.53％,形貌与一级均匀化后相同.
Keyword ：
Yb微合金化 Yb微合金化 均匀化 均匀化 微观组织 微观组织 Al-Cu-Li合金 Al-Cu-Li合金
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| GB/T 7714 | 郑直 , 高坤元 , 文胜平 et al. Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变 [J]. | 金属热处理 , 2023 , 48 (2) : 131-137 . |
| MLA | 郑直 et al. "Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变" . | 金属热处理 48 . 2 (2023) : 131-137 . |
| APA | 郑直 , 高坤元 , 文胜平 , 黄晖 , 吴晓蓝 , 魏午 et al. Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变 . | 金属热处理 , 2023 , 48 (2) , 131-137 . |
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Abstract ：
本研究以Al-Zn-Mg-Er-Zr合金为研究对象，测试获得合金在不同时效工艺下硬度、电导率、力学性能、剥落腐蚀性能的变化规律，同时使用EBSD、XRD、SEM及TEM等组织与成分表征手段对其微观组织进行分析，阐明合金最佳综合性能与其组织模式的关系。结果表明：最优的双级时效工艺为90℃/12 h+145℃/18 h；此工艺下的屈服强度为388 MPa，延伸率为14.0%，剥落腐蚀评级为PB，此时合金主要强化相（GP区和η′亚稳相）在晶内大量弥散析出，晶界处的η相呈断续分布。对比该合金T6(120℃/24 h)单级时效处理态性能：屈服强度为328 MPa，延伸率为17.75%，剥落腐蚀评级为EC，双级时效后合金综合性能得到显著提升。
Keyword ：
微观组织 微观组织 双级时效 双级时效 力学性能 力学性能 Al-Zn-Mg-Er-Zr Al-Zn-Mg-Er-Zr 剥落腐蚀 剥落腐蚀
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| GB/T 7714 | 陈炯燊 , 荣莉 , 魏午 et al. 综合提升Al-Zn-Mg-Er-Zr合金强度和耐蚀性的双级时效研究 [J]. | 稀有金属材料与工程 , 2023 , 52 (07) : 2453-2460 . |
| MLA | 陈炯燊 et al. "综合提升Al-Zn-Mg-Er-Zr合金强度和耐蚀性的双级时效研究" . | 稀有金属材料与工程 52 . 07 (2023) : 2453-2460 . |
| APA | 陈炯燊 , 荣莉 , 魏午 , 黄晖 , 高坤元 , 吴晓蓝 et al. 综合提升Al-Zn-Mg-Er-Zr合金强度和耐蚀性的双级时效研究 . | 稀有金属材料与工程 , 2023 , 52 (07) , 2453-2460 . |
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Abstract ：
针对传统铝合金在激光粉末床融合技术（Laser Powder Bed Fusion,LPBF）中的高裂纹敏感性，总结了近年来通过微合金化方法改善LPBF铝合金成型性及力学性能的研究进展。综述了微合金元素在成型过程中的作用机理，重点讨论了Er、Zr元素对微观组织的调控即晶粒细化，总结了LPBF微合金化铝合金的成型工艺研究，分析了微合金改性后热处理工艺诱导第二相弥散析出及对应力学性能的研究。对未来LPBF铝合金微合金化研究提出展望，开发新的微合金改性铝合金并探索适合工业生产的热处理工艺，获得低成本、高强度的LPBF铝合金。
Keyword ：
微合金化 微合金化 成型性 成型性 Er元素 Er元素 Zr元素 Zr元素 铝合金 铝合金 热处理 热处理 激光粉末床融合 激光粉末床融合
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| GB/T 7714 | 魏午 , 毕舰镭 , 郭彦梧 et al. 激光粉末床融合铝合金微合金化研究进展 [J]. | 海军航空大学学报 , 2023 , 38 (04) : 338-346 . |
| MLA | 魏午 et al. "激光粉末床融合铝合金微合金化研究进展" . | 海军航空大学学报 38 . 04 (2023) : 338-346 . |
| APA | 魏午 , 毕舰镭 , 郭彦梧 , 亓鹏 , 文胜平 , 高坤元 et al. 激光粉末床融合铝合金微合金化研究进展 . | 海军航空大学学报 , 2023 , 38 (04) , 338-346 . |
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Abstract ：
The effects of Pure Al/Pure Fe and Al + 0.88Si/Fe + 1.48Si intermetallics on the interfacial bonding properties of Al/Fe composites were studied. The results showed that: When there was no Si addition, IMC was just formed, when the thickness was between 200 nm and 500 nm, there was no crack in the interface and the bonding strength was high. With the increase of IMC thickness, discontinuous compounds began to form on the interface, crack appeared on the Al side of the interface, the bonding strength decreased slightly. With the extension of heat treatment time, IMC became continuous distribution, the crack length and width increased obviously, the interfacial bonding strength decreased significantly. After the addition of Si, the IMC was mainly discontinuous, and the interface did not form crack. Under the similar IMC thickness, the interface bonding strength was much higher than that of the composites without Si.
Keyword ：
Al Al Crack Crack Interface bonding strength Interface bonding strength Fe composites Fe composites Intermetallic compounds Intermetallic compounds
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| GB/T 7714 | Zhang, Xiaojun , Gao, Kunyuan , Wang, Zhen et al. Effect of intermetallic compounds on interfacial bonding of Al/Fe composites [J]. | MATERIALS LETTERS , 2023 , 333 . |
| MLA | Zhang, Xiaojun et al. "Effect of intermetallic compounds on interfacial bonding of Al/Fe composites" . | MATERIALS LETTERS 333 (2023) . |
| APA | Zhang, Xiaojun , Gao, Kunyuan , Wang, Zhen , Hu, Xiuhua , Liu, Hui , Nie, Zuoren . Effect of intermetallic compounds on interfacial bonding of Al/Fe composites . | MATERIALS LETTERS , 2023 , 333 . |
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