选区激光熔化Al-Si-Mg-Zr合金的组织和力学性能  

Microstructure and Mechanical Properties of Al-Si-Mg-Zr Alloy Produced by Selective Laser Melting

作　　者：吕洪伟 张志杰[1] 罗金杰 耿遥祥[1] 鞠洪博[1] 喻利花[1] 许俊华[1] Lv Hongwei;Zhang Zhijie;Luo Jinjie;Geng Yaoxiang;Ju Hongbo;Yu Lihua;Xu Junhua(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Kunshan Guoli Vacuum Electric Co.,Ltd,Kunshan 215333,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003 [2]昆山国力电子科技股份有限公司,江苏昆山215333

出　　处：《稀有金属材料与工程》2023年第3期1087-1093,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52001140,51801079)。

摘　　要：针对选区激光熔化(SLM)高Mg含量AlSiMg3合金成形性差的缺点,通过Zr进行合金化,研究了工艺参数对SLM成形高Mg含量Al-Si-Mg-Zr合金的成形性及时效处理对合金组织和力学性能的影响。结果表明,SLM成形Al-Si-Mg-Zr合金的熔池边界处形成了大量的细小等轴晶,从而有效地避免了样品在成形过程中裂纹的产生,增加了样品的SLM成形性,不同激光功率和激光扫描速度下获得样品的孔隙率均低于0.3%。拉伸测试结果表明,成形态样品的屈服强度(YS)为(426±8)MPa,极限抗拉强度(UTS)为(464±12)MPa。经165℃时效处理后,由于α-Al晶粒内部纳米强化相的增多,样品的强度增加明显,时效样品的最大YS和UTS分别为(482±11)MPa和(522±10)MPa。本研究获得SLM成形Al-Si-Mg-Zr样品的强度高于目前商用的SLM成形Al-Si-Mg合金。The effects of process parameters on processability,and aging treatment on microstructure and mechanical properties of selective laser melting(SLM)high Mg-content Al-Si-Mg-Zr alloy were studied.The results show that a large number of fine equiaxed grains form at the boundary of the molten pool of the alloy,which can avoid the generation of cracks during the SLM forming process and increase the processability of the sample.The porosity of the samples obtained under different process conditions is less th an 0.3%.The yield strength(YS)and ultimate tensile strength(UTS)of the as-built samples are(426±8)MPa and(464±12)MPa,respectively.After aging treatment,due to the increase in the number of nanoparticles embedded inα-Al cells,the strength of the sample increases obviously.The maximum YS and UTS of aged samples reach(482±11)MPa and(522±10)MPa,respectively.The strength of the present samples is much higher than that of commercial SLM-formed Al-Si-Mg alloy.

关 键 词：选区激光熔化 成分优化 Al-Si-Mg-Zr合金 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]