激光选区熔化ZrO_(2)/AlSi10Mg复合材料热处理显微组织与力学性能  

Microstructure and Performance Evolution of Heat-Treated ZrO_(2)/AlSi10Mg Composites Processed by Selective Laser Melting

作　　者：孙苗 杨倩 华文娟 张建勋 SUN Miao;YANG Qian;HUA Wenjuan;ZHANG Jianxun(National Innovation Institute of Additive Manufacturing,Xi'an 710065,China)

机构地区：[1]西安增材制造国家研究院有限公司,西安陕西710065

出　　处：《材料开发与应用》2024年第1期38-46,共9页Development and Application of Materials

基　　金：民用航天预研项目(D020302)。

摘　　要：AlSi10Mg作为增材制造最为常用的铝合金材料,其激光选区熔化(SLM)制品已经广泛应用于航空航天、汽车工业等领域,但较低的强度和塑性限制了其应用范围的扩展。本研究通过在AlSi10Mg合金气雾化粉末中添加0.3%(质量分数)纳米ZrO_(2)颗粒,采用SLM技术成形ZrO_(2)/AlSi10Mg复合材料,研究不同热处理制度下其组织及性能演化规律和性能各向异性行为。结果表明,复合材料的抗拉强度随热处理温度(180℃~270℃)提高持续下降,伸长率随着热处理温度的提高先降低后升高,180℃/2 h退火后ZrO_(2)/AlSi10Mg表现出最佳的强塑性匹配,此时抗拉强度为481.74 MPa,屈服强度为331.03 MPa,伸长率为8.56%;在热处理过程中,复合材料中ZrO_(2)陶瓷颗粒保持着稳定的结构,热处理相变为AlSi10Mg基体的相变;此外,随着热处理温度的提高,ZrO_(2)/AlSi10Mg复合材料的大角度晶界比例显著增加,平均局部取向差减小;ZrO_(2)/AlSi10Mg复合材料180℃/2 h热处理后,横向和纵向抗拉强度及伸长率均显著优于对应取向的AlSi10Mg合金的。AlSi10Mg is the most commonly used aluminum alloy material for additive manufacturing,and its selective laser melting(SLM)products have been widely used in aerospace,automotive industry,and other fields.However,its low strength and plasticity limit its wide application.In this study,0.3%(mass fraction)nano ZrO_(2) particles are added to AlSi10Mg alloy atomized powder,and the ZrO_(2)/AlSi10Mg composite is formed by using the SLM technology.The microstructure,tensile property and anisotropic behavior are studied under different heat treatment regimes.The results show that when the annealing temperature rises from 180℃to 270℃,the tensile strength decreases continuously,and the elongation first decreases and then increases.After being annealed at 180℃for 2 hours,ZrO_(2)/AlSi10Mg show the best match of strength and plasticity,with the tensile strength of 481.74 MPa,the yield strength of 331.03 MPa,and the elongation of 8.5%.In the process of annealing treatment,the ZrO_(2) ceramic particles in the composite material maintain a stable structure,and the phase transition is mainly the transition of the AlSi10Mg matrix.In addition,with the increase of annealing temperature,the proportion of large angle grain boundaries in the ZrO_(2)/AlSi10Mg composite material significantly increases,and the average local misorientation decreases.When the ZrO_(2)/AlSi10Mg composite is annealed at 180℃for 2 hours,the tensile strength and elongation in the transverse and longitudinal sections are significantly better than those of the corresponding sections of the AlSi10Mg alloy.

关 键 词：ZRO2 AlSi10Mg 激光选区熔化 热处理 组织及性能 

分 类 号：TG156[金属学及工艺—热处理]