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学者姓名：崔丽
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Abstract ：
In order to study the effect of non-contact ultrasonic-assisted laser metal deposition (LMD) on microcracks, Febased powders were deposited on a 42CrMoA steel using LMD process at different excitation distances (d). The results show that the maximum length of microcracks is 112.3 mu m under the condition without ultrasonicassisted. When d = 50 mm, a crack of less than 10 mu m is generated at the bottom of deposition layer. When d = 110 mm, the microcrack maximum length is 84.4 mu m. The deposition layer with no microcracks was obtained when d = 80 mm. Ultrasonic-assisted application can synergically inhibit the generation of cracks from two aspects. On the one hand, it makes the distribution of B element more uniform in the molten pool, and the accumulation of borides at the bottom of the deposition layer easily generates hard and brittle borides such as M23(C,B)6, which is more likely to induce cracks. After non-contact ultrasonic-assisted, the width of boride is 54.2 % lower than that without ultrasonic-assisted, and the boride morphology is slightly different. The borides changed from long rod-shape and mesh-shape to nanoscale short rod-shape and granular-shape. On the other hand, it can make the microscopic stress distribution at the bottom of deposition layer more uniform, which reduces the crack sensitivity. Compared to the condition without ultrasonic-assisted, when d is 50 mm, 80 mm and 110 mm, the KAM average value decreased by 44.03 %, 40.36 % and 19.27 %, respectively.
Keyword ：
Non-contact Ultrasonic-assisted (UVA) Non-contact Ultrasonic-assisted (UVA) Laser metal deposition (LMD) Laser metal deposition (LMD) Fe-based powder Fe-based powder Impact toughness Impact toughness Crack inhibition mechanism Crack inhibition mechanism
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| GB/T 7714 | Li, Huachen , Cui, Li , He, Dingyong et al. Effect of ultrasonic-assisted laser metal deposition on microcracks in deposition layer [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 181 . |
| MLA | Li, Huachen et al. "Effect of ultrasonic-assisted laser metal deposition on microcracks in deposition layer" . | OPTICS AND LASER TECHNOLOGY 181 (2024) . |
| APA | Li, Huachen , Cui, Li , He, Dingyong , Shi, Zhenfu , Bu, Fanhui , Cao, Qing et al. Effect of ultrasonic-assisted laser metal deposition on microcracks in deposition layer . | OPTICS AND LASER TECHNOLOGY , 2024 , 181 . |
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Abstract ：
Welding of AlSi10Mg alloys fabricated by additive manufacturing (AM) has been recently conducted to meet the demands for joining or repairing them. However, high susceptibility to porosity occurring in weld metal (WM) poses a significant challenge for fusion welding of AM AlSi10Mg alloys. The laser metal deposition (LMD) process has emerged as a promising welding solution due to its low dilution rate for reducing the porosity. In this study, LMD welding of AM AlSi10Mg alloys was carried out employing different heat inputs with five and eight tracks. The study systematically assessed the impact of heat input on porosity, microstructure, and mechanical properties of the welded joints. The results show that the decrease of heat input from 180 to 75 J/mm results in a substantial reduction in porosity from 7.0 to 2.1%. This reduction leads to a 29.4% increase in ultimate tensile strength (UTS) and an 11.7% increase in elongation index (EI). Furthermore, the upper region of joints with eight tracks possessing low heat input displays lower porosity and superior mechanical properties than the bottom region with relatively high heat input. The WM with eight tracks exhibits refined alpha-Al cells and Si-rich eutectic phases, improved connectivity of Si-rich networks, and increased solid solution strengthening, compared to the five-track joints with higher heat input. As a result, low heat input of the upper region in the LMD welded joints has been effective in minimizing hydrogen pores, enhancing WM microstructure, and improving the mechanical properties of welded joints in AM AlSi10Mg alloys.
Keyword ：
Porosity Porosity Microstructure Microstructure LMD welding LMD welding LPBF AlSi10Mg alloys LPBF AlSi10Mg alloys Mechanical properties Mechanical properties
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| GB/T 7714 | Li, Jingchuan , Cui, Li , Wu, Defan et al. Welding of additive manufacturing AlSi10Mg alloys using a laser metal deposition process with different heat inputs [J]. | WELDING IN THE WORLD , 2024 , 68 (8) : 2083-2101 . |
| MLA | Li, Jingchuan et al. "Welding of additive manufacturing AlSi10Mg alloys using a laser metal deposition process with different heat inputs" . | WELDING IN THE WORLD 68 . 8 (2024) : 2083-2101 . |
| APA | Li, Jingchuan , Cui, Li , Wu, Defan , Wang, Can , Shi, Zhenfu , He, Dingyong et al. Welding of additive manufacturing AlSi10Mg alloys using a laser metal deposition process with different heat inputs . | WELDING IN THE WORLD , 2024 , 68 (8) , 2083-2101 . |
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Abstract ：
本发明公开了一种竹笋结构W‑Zr基非晶合金复合材料及其制备方法与应用，涉及金属复合材料技术领域，复合材料的整体结构上分别存在硬脆区和软韧区，其中硬脆区体积分数为10％～30％，软韧区体积分数为70％～90％，两区域呈锥形交替分布，其分布为仿生竹笋结构，这种竹笋结构的优势在于：在高应变速率条件下，软韧区先发生变形，随着变形程度增加，软韧区与硬脆区同时变形，随后硬脆区开裂，沿着设计结构方式分离脱落，重新露出尖锐区域完成自锐化，类似竹笋剥落；循环此步骤，完成侵彻过程，可显著增加穿甲弹威力。
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| GB/T 7714 | 谈震 , 席钊 , 宁子阳 et al. 一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用 : CN202310055654.3[P]. | 2023-01-17 . |
| MLA | 谈震 et al. "一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用" : CN202310055654.3. | 2023-01-17 . |
| APA | 谈震 , 席钊 , 宁子阳 , 贺定勇 , 周正 , 郭星晔 et al. 一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用 : CN202310055654.3. | 2023-01-17 . |
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Abstract ：
本发明涉及一种具有低热导率和高热稳定性的高熵硅酸盐陶瓷及其制备方法与应用。高熵陶瓷材料的化学式为RE2Si2O7，其中RE可为Er，Sc，Lu，Yb或Tm中的任意四种稀土元素。制备方法为：以四种RE2O3粉体和纯SiO2粉体为原料，以丙酮或无水乙醇为混合介质，用高能球磨机混合，充分混合的粉末经过烘干、研磨、筛分后，选取筛分后的细粉，在1500～1600℃的温度范围煅烧合成高熵陶瓷材料，然后采用放电等离子烧结法制备致密的块材陶瓷。所制备的陶瓷块材的致密度可达98％以上，经测量该材料具有非常低的热导率，在室温到1000℃范围内热导率均小于1.1W/m.K，可以用作防隔热材料。
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| GB/T 7714 | 贺定勇 , 欧克 , 郭星晔 et al. 一种具有低热导率和高热稳定性的高熵硅酸盐陶瓷及其制备方法与应用 : CN202210112836.5[P]. | 2022-01-29 . |
| MLA | 贺定勇 et al. "一种具有低热导率和高热稳定性的高熵硅酸盐陶瓷及其制备方法与应用" : CN202210112836.5. | 2022-01-29 . |
| APA | 贺定勇 , 欧克 , 郭星晔 , 崔丽 , 周正 , 谈震 et al. 一种具有低热导率和高热稳定性的高熵硅酸盐陶瓷及其制备方法与应用 : CN202210112836.5. | 2022-01-29 . |
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Abstract ：
The additive manufactured (AM) parts of aluminum alloys have been widely used in defense, aerospace, automotive and other industries. There is a growing demand for joining or repairing of the AM parts of aluminum alloys using welding technology. However, the problems of high porosity and joint softening are occurred when welding of aluminum alloy AM parts, which have become technical bottlenecks that need to be solved urgently. Laser welding of AlSi10Mg alloys fabricated by selective laser melting (SLM) with an addition of Er and Zr in the filler metal was carried out. The effect of Er and Zr addition on the porosity, microstructures and mechanical properties of the welded joints was investigated, and the contribute of Er and Zr addition to the yield strength (YS) of the welded joints was calculated. Compared that joints without Er and Zr addition, the average ultimate tensile strength (UTS) and YS of the welded joints with Er and Zr addition have been increased by 10.5% and 23.5%, respectively. The improved mechanical poverty of the welded joints is due to the refined alpha-Al grains and Si-rich cellular networks, and the reduced hydrogen pores occurred in the weld metal (WM) with the addition of Er and Zr. The YS calculation of the weld joints indicates the most important contribution to the YS is the enhancement effect of the Si-rich networks with Er and Zr.
Keyword ：
Weldability Weldability Er and Zr addition Er and Zr addition SLM AlSi10Mg alloys SLM AlSi10Mg alloys Laser welding Laser welding
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| GB/T 7714 | Peng, Zhibo , Cui, Li , He, Dingyong et al. Effect of Er and Zr addition on laser weldability of AlSi10Mg alloys fabricated by selective laser melting [J]. | MATERIALS CHARACTERIZATION , 2022 , 190 . |
| MLA | Peng, Zhibo et al. "Effect of Er and Zr addition on laser weldability of AlSi10Mg alloys fabricated by selective laser melting" . | MATERIALS CHARACTERIZATION 190 (2022) . |
| APA | Peng, Zhibo , Cui, Li , He, Dingyong , Guo, Xingye , Zeng, Yong , Cao, Qing et al. Effect of Er and Zr addition on laser weldability of AlSi10Mg alloys fabricated by selective laser melting . | MATERIALS CHARACTERIZATION , 2022 , 190 . |
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Abstract ：
The Mo-10Si-(0, 5, 10, 15)B (at.%) alloys located in Moss (Mo solid solution) +Mo3Si +T2 (Mo5SiB2) region were prepared by arc melting. The effect of B content on the microstructure, microhardness, fracture toughness and oxidation resistance of the alloys was studied. In the Mo-10Si alloy, there are primary Mo-ss and peritectic Mo3Si phases. With the addition of B, (Mo-ss + T2) binary and (Mo-ss + T2 + Mo3Si) ternary eutectics emerge in Mo-10Si-(5, 10)B alloys. For Mo-10Si-15B alloy, primary Moss disappears and the mi-crostructure is only composed of binary and ternary eutectics. With the increase of B content, the proportion and grain size of Mo-ss decrease. The microhardness of alloys increases with the increase of B content due to the increasing intermetallics. The fracture toughness of alloys decreases obviously in single-edge notched three-point bending testing (SENB) and the fracture mode transforms from transgranular fracture to intergranular fracture because of the refinement of Mo-ss. In the high-temperature oxidation test at 1250 degrees C, the oxidation weight loss of the alloys decreases with the addition of B due to the densification of the borosilicate layer. (C) 2021 Elsevier B.V. All rights reserved.
Keyword ：
Microstructure Microstructure Oxidation resistance Oxidation resistance B content B content Mo-Si-B alloys Mo-Si-B alloys Fracture toughness Fracture toughness
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| GB/T 7714 | Jin, Ming , He, Dingyong , Shao, Wei et al. Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 890 . |
| MLA | Jin, Ming et al. "Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys" . | JOURNAL OF ALLOYS AND COMPOUNDS 890 (2022) . |
| APA | Jin, Ming , He, Dingyong , Shao, Wei , Tan, Zhen , Guo, Xingye , Zhou, Zheng et al. Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 890 . |
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Abstract ：
对3 mm厚TC4钛合金/15-5PH不锈钢异种材料进行了添加镍铝青铜(nickel aluminum bronze,NAB)过渡层的激光填充材料焊接，研究了NAB过渡层对接头成形、微观组织与力学性能的影响.结果表明，添加NAB过渡层的TC4钛合金/15-5PH不锈钢异种材料激光焊接获得了良好成形的全熔透接头，接头抗拉强度达290 MPa，接头钛合金侧界面层硬度为547.8 HV.接头钛合金侧界面由3种不同形态的金属间化合物层组成，其中脆性较小的Cu-Ti,Ni-Ti相的数量显著增多，而脆性高的Ti-Fe相数量明显减少，表明添加NAB过渡层抑制了接头钛合金侧界面脆性高的Ti-Fe相的形成.
Keyword ：
钛合金 钛合金 激光焊 激光焊 力学性能 力学性能 不锈钢 不锈钢
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| GB/T 7714 | 牛小男 , 崔丽 , 王鹏 et al. 镍铝青铜过渡层对钛合金/不锈钢异种材料激光焊接头组织与力学性能的影响 [J]. | 焊接学报 , 2022 , 43 (01) : 42-47,115-116 . |
| MLA | 牛小男 et al. "镍铝青铜过渡层对钛合金/不锈钢异种材料激光焊接头组织与力学性能的影响" . | 焊接学报 43 . 01 (2022) : 42-47,115-116 . |
| APA | 牛小男 , 崔丽 , 王鹏 , 贺定勇 , 曹庆 . 镍铝青铜过渡层对钛合金/不锈钢异种材料激光焊接头组织与力学性能的影响 . | 焊接学报 , 2022 , 43 (01) , 42-47,115-116 . |
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Abstract ：
对3mm厚激光选区熔化成形(SLM)TC4钛合金对接接头进行了激光焊接工艺试验,研究了80J/mm和100J/mm两种能量输入对接头焊缝成形、微观组织及接头力学性能的影响。结果表明,在两种不同焊接能量输入条件下,激光焊接SLM成形TC4钛合金获得良好的焊缝成形,焊缝区的平均显微硬度分别为388.7HV及403.3HV,高于SLM成形TC4钛合金母材(370.6HV),接头的抗拉强度分别为1027MPa及1018MPa,略低于母材(1201MPa)。
Keyword ：
激光焊接 激光焊接 激光选区熔化 激光选区熔化 力学性能 力学性能 接头组织 接头组织 TC4钛合金 TC4钛合金
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| GB/T 7714 | 田天 , 崔丽 , 贺定勇 et al. 激光选区熔化成形TC4钛合金激光焊接头组织与力学性能 [J]. | 航空科学技术 , 2022 , 33 (04) : 102-107 . |
| MLA | 田天 et al. "激光选区熔化成形TC4钛合金激光焊接头组织与力学性能" . | 航空科学技术 33 . 04 (2022) : 102-107 . |
| APA | 田天 , 崔丽 , 贺定勇 , 吴旭 , 郭星晔 . 激光选区熔化成形TC4钛合金激光焊接头组织与力学性能 . | 航空科学技术 , 2022 , 33 (04) , 102-107 . |
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Abstract ：
采用气雾化制粉技术原位合金化制备了AlSi10Mg-Er-Zr粉末,研究了选区激光熔化(SLM)成形AlSi10Mg-Er-Zr试样的相对密度、微观组织和力学性能。结果表明,SLM成形AlSi10Mg-Er-Zr试样的相对密度为99.20%,显微硬度为156.5 HV,室温抗拉强度达到461 MPa,屈服强度为304 MPa,相对于常规AlSi10Mg试样显微硬度提升了25.8%,抗拉强度和屈服强度分别提高了22.6%和26.7%。这是由于Er、Zr元素的加入,细化了SLM成形AlSi10Mg-Er-Zr试样的晶粒尺寸,并且使α-Al基体中Si元素的固溶度增加,由细晶强化和固溶强化机制共同作用...
Keyword ：
选区激光熔化 选区激光熔化 力学性能 力学性能 稀土元素 稀土元素 AlSi10Mg-Er-Zr合金 AlSi10Mg-Er-Zr合金 显微组织 显微组织
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| GB/T 7714 | 杨天野 , 崔丽 , 贺定勇 et al. 选区激光熔化AlSi10Mg-Er-Zr合金微观组织及力学性能强化 [J]. | 金属学报 , 2022 , 58 (09) : 1108-1117 . |
| MLA | 杨天野 et al. "选区激光熔化AlSi10Mg-Er-Zr合金微观组织及力学性能强化" . | 金属学报 58 . 09 (2022) : 1108-1117 . |
| APA | 杨天野 , 崔丽 , 贺定勇 , 黄晖 . 选区激光熔化AlSi10Mg-Er-Zr合金微观组织及力学性能强化 . | 金属学报 , 2022 , 58 (09) , 1108-1117 . |
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Abstract ：
The welding process has been recently introduced to join of the materials fabricated by powder bed fusion (PBF) additive manufacturing (AM) to meet the requirement for the large parts and their repair in service. However, one of the main issues is the high susceptibility to the hydrogen pores occurred during fusion welding of the PBF aluminum (Al) alloys. Autogenous laser welding of a selective laser melting (SLM) AlSi10Mg alloy was firstly carried out in comparison with the casting AlSi10Mg alloy to examine the hydrogen pore characteristics. Singlepass welding with filler powders and laser melting deposition (LMD) welding were then performed on SLM AlSi10Mg alloys to reduce the hydrogen pores. The porosity, microstructure, microhardness and tensile property of the welded joints were investigated. As a result, a high susceptibility to hydrogen pores of SLM AlSi10Mg alloys is occurred in the weld metal (WM) of the welded joint produced by autogenous laser welding and singlepass laser welding due to the high hydrogen content pre-existing in the base metal (BM). However, LMD welding has been shown to effectively reduce the pore size and the porosity generated in the WM of SLM AlSi10Mg alloys. The laser welding of SLM AlSi10Mg alloys produces lower hardness and ultimate tensile strength (UTS) than that of the BM. However, the LMD welding of SLM AlSi10Mg alloys achieves higher hardness and UTS than those of the autogenous laser welding and single-pass laser welding, which is attributed to the refined microstructures and the reduced hydrogen pores in the WM.
Keyword ：
Single-pass laser welding Single-pass laser welding Hydrogen pores Hydrogen pores Laser melting deposition (LMD) welding Laser melting deposition (LMD) welding Mechanical properties Mechanical properties SLM AlSi10Mg alloys SLM AlSi10Mg alloys Microstructures Microstructures
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| GB/T 7714 | Cui, Li , Peng, Zhibo , Chang, Yaoqing et al. Porosity, microstructure and mechanical property of welded joints produced by different laser welding processes in selective laser melting AlSi10Mg alloys [J]. | OPTICS AND LASER TECHNOLOGY , 2022 , 150 . |
| MLA | Cui, Li et al. "Porosity, microstructure and mechanical property of welded joints produced by different laser welding processes in selective laser melting AlSi10Mg alloys" . | OPTICS AND LASER TECHNOLOGY 150 (2022) . |
| APA | Cui, Li , Peng, Zhibo , Chang, Yaoqing , He, Dingyong , Cao, Qing , Guo, Xingye et al. Porosity, microstructure and mechanical property of welded joints produced by different laser welding processes in selective laser melting AlSi10Mg alloys . | OPTICS AND LASER TECHNOLOGY , 2022 , 150 . |
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