挤压成形及热处理对过共晶Al-15Si合金组织和性能的影响  

Effects of Squeeze Casting and T6 Heat Treatment on Microstructures and Properties of Hyper-Eutectic Al-15Si Alloy

作　　者：刘涛 游志勇[1] 赵薛生 马振星 于杰 王彬 LIU Tao;YOU Zhi-yong;ZHAO Xue-sheng;MA Zhen-xing;YU Jie;WANG Bin(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《铸造》2022年第10期1235-1239,共5页Foundry

摘　　要：采用金属型铸造及挤压铸造两种工艺制备了过共晶Al-15Si合金,再经过固溶时效热处理(T6),观察其组织与性能。结果表明,挤压铸造及T6热处理均可改善并提高该合金的组织和性能。相比金属型铸造,挤压铸造后,合金微观组织中各相均得以不同程度的细化,且出现了初生α-Al枝晶,合金抗拉强度由255 MPa提升到278 MPa,硬度由HV81.7提高到HV93.7。T6热处理后,合金微观组织形貌趋于圆整化,金属型合金抗拉强度提升至315 MPa,硬度提高至HV96.2,而挤压合金抗拉强度提升至341 MPa,硬度值提高到HV107.3。Hyper-eutectic Al-15Si alloys were prepared by metal mold casting and squeeze casting, and its microstructure and properties were observed after solution aging treatment(T6). The results showed that both squeeze casting and T6 heat treatment improved the microstructure and properties of the alloy. Compared with the metal mold casting, the microstructure of the alloy was refined to different degrees, and the pre-α-Al dendrite appeared.The tensile strength of the alloy was increased from 255 MPa to 278 MPa, and the hardness was increased from HV81.7 to HV93.7. After T6 heat treatment, the microstructure of the alloy tended to be rounded. The tensile strength of the alloy using the metal mold casting was increased to 315 MPa and the hardness was increased to HV96.2, while the tensile strength of the extruded alloy was increased to 341 MPa and the hardness was increased to HV107.3.

关 键 词：挤压铸造 热处理 组织 性能 过共晶AL-SI合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]