(1. 哈尔滨理工大学 材料科学与工程学院，哈尔滨 150040；
2. 哈尔滨吉星机械工程有限公司，哈尔滨 150069；
3. 临沂市科学技术合作与应用研究院，临沂 276000)
摘 要: 研究了固溶时间对挤压铸造ADC12铝合金显微组织及力学性能的影响。结果表明：随着固溶时间的延长，显微组织中粗大片状共晶Si和针状Al5FeSi相均细化为细小颗粒状，长宽比(L/B)值由8.9降到2.0；合金的抗拉强度由挤压铸态的227 MPa增加到固溶时间为10 h的274 MPa；维氏硬度呈现先增加后降低的趋势，在固溶时间为4 h时达到最大值110HV，之后趋于稳定。ADC12铝合金断裂形式由准解理断裂向韧性断裂转变。
关键字: ADC12铝合金；间接挤压铸造；固溶时间；显微组织；力学性能
（1. School of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
2. Harbin Jixing Mechanical Engineering Company Limited, Harbin 150069, China;
3. Linyi Academy of Technology Cooperation and Application, Linyi 276000, China）
Abstract:The microstructure and mechanical properties of ADC12 aluminum alloy with different solution time were studied. The results show that, with the increase of solution time, the coarse lamellar eutectic Si and the needle like Al5FeSi phase in the squeeze casting microstructure are fine granular, and the ratio of length to width(L/B value) decreases from 8.9 to 2. The tensile strength of the material increases from 227 MPa of the squeeze casting to 274 MPa after 10 h solution treatment; Vickers hardness exhibits reducing after the first increase trend in the solution time to reach maximum 110HV at 4 h, and then trends to stable. The fracture form of ADC12 casting aluminum alloy transforms from quasi cleavage fracture to ductile fracture after solution treatment.
Key words: ADC12 aluminum alloy; indirect squeeze casting; solution time; microstructure; mechanical property
