热处理对复合变质AlSi10MnMg合金组织、导热及力学性能的影响  

Effects of Heat Treatment on Microstructure,Thermal Conductivity,and Mechanical Properties of Composite Modified AlSi10MnMg Alloy

作　　者：刘文憬 李元东[1,2] 罗晓梅[1] 王梓臣 周宏伟[1,2] 毕广利 LIU Wenjing;LI Yuandong;LUO Xiaomei;WANG Zichen;ZHOU Hongwei;BI Guangli(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050;Key Laboratory of Nonferrous Metal Alloy and Processing,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《特种铸造及有色合金》2024年第9期1153-1160,共8页Special Casting & Nonferrous Alloys

基　　金：甘肃省基础研究计划-自然科学基金资助项目(22JR5RA251)。

摘　　要：采用挤压铸造结合Sr+Ce复合变质制备AlSi10MnMg合金试样,研究热处理工艺对合金组织及性能的影响规律。结果表明,热处理后合金组织变得更规则,其中共晶Si相由蠕虫状、珊瑚状转变为更加细小的颗粒状,边界形貌更加圆整,电子传递效率增高,合金热导率有所上升。经540℃×0.5 h固溶处理后,合金热导率达到最高,为194.53 W/(m·K),相比Sr+Ce复合变质合金提升了7.07%;T6热处理后,由于部分共晶Si析出以及晶格畸变的影响,合金热导率存在下降趋势。随着固溶时间延长,合金抗拉强度整体呈下降趋势,伸长率呈上升趋势。T6热处理后,合金抗拉强度及屈服强度得到进一步增强,伸长率则由于合金元素的析出降幅明显。当热处理工艺为530℃×0.5 h固溶+180×6 h时效时,合金的抗拉强度、屈服强度和伸长率分别达到348.26 MPa、263 MPa和14.92%,相比Sr+Ce复合变质后合金的分别提升了52.1%、205.8%和2.1%。AlSi10MnMg alloy specimens were fabricated by Sr and Ce composite modification combined with squeeze casting,and effects of heat treatment on microstructure and properties of alloy were investigated.The results indicate that the structure become more uniform after heat treatment,where the eutectic Si phase is transformed from wormlike and coral-like to finer particles,and boundary morphology is more spheroidized,with increasing electron transfer efficiency and thermal conductivity.After 540℃×0.5 h solid solution treatment,the thermal conductivity attains a maximum of 194.53 W/(m·K),which is increased by 7.07%compared to that of one with Sr+Ce composite modification.After T6 heat treatment,the thermal conductivity of the alloy tends to decrease due to the partially eutectic Si precipitation and lattice distortion.The overall tensile strength of the alloy is declined with increase in solid solution time,while elongation is increased,and the tensile and yield strength are further enhanced after T6 heat treatment,whereas elongation is decreased considerably due to the precipitation of alloy elements.After 530℃×0.5 h solid solution+180℃×6 h T6 aging heat treatment,the tensile strength,yield strength and elongation reach 348.26 MPa,263 MPa and 14.92%,which is enhanced by 52.1%,205.8%and 2.1%compared to those of ones with Sr+Ce composite modification,respectively.

关 键 词：AlSi10MnMg铝合金 热处理 导热性能 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]