深冷循环处理对激光选区熔化AZ91D力学性能的影响  

Effect of Deep-cooling Cycle Treatment on the Mechanical Properties of Laser-selective Zone-melted AZ91D

作　　者：戴相龙 武练梅 周燕[3] 宋波 李学 王晓强 文世峰[1] DAI Xianglong;WU Lianmei;ZHOU Yan;SONG Bo;LI Xue;WANG Xiaoqiang;WEN Shifeng(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Beijing Institute of Electronic System Engineering,Beijing 100854,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074 [2]北京电子工程总体研究所,北京100854 [3]华中科技大学土木与水利工程学院,武汉430074

出　　处：《有色金属工程》2024年第12期122-128,共7页Nonferrous Metals Engineering

基　　金：国家重点研发计划项目(2023YFB4603300);国家自然科学基金资助项目(52275332,52274400)。

摘　　要：聚焦于激光选区熔化(Selective Laser Melting,SLM)技术制造的AZ91D镁合金部件,探讨深冷循环处理对其微观结构和力学性能的影响。通过深冷循环处理显著改善了AZ91D镁合金的微观结构和力学性能。研究发现,经过四次深冷循环处理后,生成细小且弥散的β-Al_(12)Mg_(17)沉淀相,显著提高了材料的力学性能,伸长率提高了73.0%,屈服强度提高了14.0%,抗拉强度提高了15.4%。然而,十次深冷循环处理后,β-Al_(12)Mg_(17)相消失,导致材料强度降低。实验结果表明,适当的深冷循环处理次数能有效提升SLM成形AZ91D镁合金的力学性能,而过多的循环可能导致材料性能下降。研究为SLM成形镁合金的后处理提供了重要手段,对于航空航天和现代工业领域中高性能镁合金部件的应用具有重要参考意义。This study examined the impact of deep-cooling cycle treatments on the microstructure and mechanical properties of SLM-fabricated AZ91D magnesium alloy components.Deep-cooling cycle treatments,involving repeated exposure to extremely low temperatures followed by heating,markedly enhanced the microstructure and mechanical properties of the AZ91D magnesium alloy.After four deep-cooling cycle treatments,theβ-Al_(12)Mg_(17) phase of the alloy increased,which significantly improved the strength and ductility of the material.However,after ten deep cooling cycle treatments,the β-Al_(12)Mg_(17) phase diminished,leading to a decrease in the strength of the material.The experimental results indicate that the appropriate number of deep-cooling cycle treatments can effectively enhance the mechanical properties of SLM-formed AZ91D magnesium alloy,while excessive cycles may lead to the degradation of material properties.This study provides a scientific basis for the post-treatment of SLM-formed magnesium alloys,significantly impacting the application of high-performance magnesium alloy components in aerospace and advanced industries.

关 键 词：AZ91D镁合金 激光选区熔化 深冷循环处理 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]