热处理对选择性激光熔融制备模锻铝合金的显微组织调控研究  

Research on Effects of Heat Treatment on Microstructure Controlof Forged Aluminum Alloys Prepared by Selective Laser Melting

作　　者：常秋香 于艳美 CHANG Qiuxiang;YU Yanmei(School of Mechanical Engineering and Automation,School of Science and Technology,Ningbo University,Ningbo 315212,China)

机构地区：[1]宁波大学科学技术学院机械工程与自动化学院,浙江宁波315212

出　　处：《热加工工艺》2024年第20期106-109,共4页Hot Working Technology

基　　金：浙江省公益项目(GG19E070003)。

摘　　要：通过OM、显微硬度计、SEM及TEM对选择性激光熔融制备的7A09铝合金经过固溶与双级时效处理后的显微组织、硬度及相变进行了探究。结果表明,未经处理的7A09合金显微组织展现出显著的通道间非均匀性,而经过固溶与双级时效处理后,该合金表现出均匀且细小的显微组织,通道结构消失。在该处理下合金的硬度相较于原始状态合金(82 HV)有所提高,平均达到约160 HV。晶界处的沉淀S相(Al2CuMg)及θ相(Al2Cu)为合金的强化相,提供了弥散强化和沉淀强化的效应。The microstructure,hardness and phase transformation of 7A09 aluminum alloy prepared by selective laser melting(SLM)after solid solution and two-stage aging were investigated by means of OM,microhardness tester,SEM and TEM.The results show that the microstructure of the untreated 7A09 alloy has significant inter-channel heterogeneity.After solution and two-stage aging treatment,the alloy shows uniform and fine microstructure,and the channel structure disappeares.The hardness of the alloy under the treatment is higher than that of the original alloy(82 HV),reaching an average of about 160 HV.The precipitation of S phase(Al2CuMg)andθphase(Al2Cu)at the grain boundary are the strengthening phases of alloy,which provides the effect of dispersion strengthening and precipitation strengthening.

关 键 词：选择性激光熔化 7A09铝合金 热处理 微观结构 力学性能 

分 类 号：TG156.92[金属学及工艺—热处理] TG156.94[金属学及工艺—金属学]