耿遥祥,唐浩,罗金杰,许俊华,李洁,鞠洪博,喻利花,张志杰.高Mg含量Al-Mg-Sc-Zr合金选区激光熔化成形及力学性能研究[J].稀有金属材料与工程,2021,50(3):939~947.[Geng Yaoxiang,Tang Hao,Luo Jinjie,Xu Junhua,Li Jie,Ju Hongbo,Yu Lihua,Zhang Zhjie.Processability and Mechanical Properties of High Mg-content Al-Mg-Sc-Zr Alloy Produced by Selective Laser Melting[J].Rare Metal Materials and Engineering,2021,50(3):939~947.]
高Mg含量Al-Mg-Sc-Zr合金选区激光熔化成形及力学性能研究
投稿时间:2020-02-19  修订日期:2020-04-24
中文关键词:  选区激光熔化,Al-Mg-Sc-Zr铝合金,时效处理,显微组织,力学性能
基金项目:国家重点研发计划项目(No. 2016YFB1100103)、国家自然科学(No. 51801079)江苏省自然科学基金青年(Nos. BK20180985、BK20180987)、江苏省高等学校自然科学研究面上项目(No. 18KJB430011)和镇江市海洋功能薄膜材料高技术研究重点实验室开放课题(No. ZHZ2019001)资助
中文摘要:
      基于宽粒径分布粉末(2-46 μm),应用选区激光熔化(SLM)技术制备了高Mg含量Al-14.4Mg-0.33Sc-0.19Zr铝合金。系统研究了不同工艺参数和时效处理条件对合金SLM成形性、组织和力学性能的影响。结果表明,高激光功率可有效降低细粉飞溅对样品成形性的干扰,SLM成形样品的最大的相对密度为98.6%。样品显微组织由熔池边界细小等轴晶和熔池内部粗大晶粒构成,Mg含量的增加降低了样品织构和柱状晶的含量。经不同温度时效处理后,SLM成形样品的硬度先增加后降低,在350 ℃时具有最大值。SLM成形样品在350 ℃下时效处理时,硬度和压缩屈服强度均随时效时间的增加出现双峰值现象,时效1 h后样品的硬度和强度均达到最大值,分别为163±3 HV和457±10 MPa,延伸率为27±3%。样品经350 ℃长时间时效处理后,由于第二相粒子的粗化,导致样品的硬度和强度有所降低。本研究通过保留铝合金粉末的细粉区,有效提升了粉末的利用率,降低了原料成本,获得了成形性和力学性能较优的高Mg含量SLM成形Al-Mg-Sc-Zr铝合金。
Processability and Mechanical Properties of High Mg-content Al-Mg-Sc-Zr Alloy Produced by Selective Laser Melting
英文关键词:Selective laser melting  Al-Mg-Sc-Zr alloy  aging treatment  microstructure  mechanical properties
英文摘要:
      Al-14.4Mg-0.33Sc-0.19Zr aluminium alloy with wide particle size distribution powders (2-46 μm) and high Mg-content was prepared by selective laser melting (SLM). The effects of different process parameters and aging treatment on the processability, microstructure and mechanical properties of SLM-formed Al-Mg-Sc-Zr alloy were systematically studied. Experimental results showed that the high laser power could effectively reduce the influence of fine powders splash on the processability of the samples. The maximum relative density of the sample reached 98.6%. The microstructures of the samples composed of fine equiaxed grains and coarse grains. The increase of Mg content in Al-Mg-Sc-Zr alloy reduced the texture and the content of columnar grains. The micro-hardness first increased and then decreased with the increases of aging temperatures. Both micro-hardness and compression yield strength showed dual-peak phenomenon with the increase of aging time at 350 ℃. The maximum micro-hardness ~ 163±3 HV and compressive yield strength ~ 457±10 MPa appeared for the sample ageing treatment at 350 ℃ for 1 h, with an elongation of 27±3%. After aged the samples at 350 ℃ for a long time, the micro-hardness and compressive yield strength of the sample decreased due to coarsening of the precipitated particles. In this study, the utilization ratio of the powders were efectively improved by increasing the particle size distribution of alloy powders, and SLM-formed high Mg-content Al-Mg-Sc-Zr alloy exhibited good processability and mechanical properties.
作者单位E-mail
耿遥祥 江苏科技大学材料科学与工程学院 1027431200@qq.com 
唐浩 江苏科技大学材料科学与工程学院  
罗金杰 江苏科技大学材料科学与工程学院  
许俊华 江苏科技大学材料科学与工程学院  
李洁 江苏科技大学材料科学与工程学院  
鞠洪博 江苏科技大学材料科学与工程学院  
喻利花 江苏科技大学材料科学与工程学院  
张志杰 江苏科技大学材料科学与工程学院  
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