Microstructure characteristics and mechanical properties of rheoformed wrought aluminum alloy 2024  

作　　者：郭洪民 杨湘杰 张萌 

机构地区：[1]School of Materials Science and Engineering,Nanchang University [2]School of Mechanical and Electronic Engineering,Nanchang University

出　　处：《中国有色金属学会会刊：英文版》2008年第3期555-561,共7页Transactions of Nonferrous Metals Society of China

基　　金：Project(50474007) supported by the National Natural Science Foundation of China;Project(0450050) supported by the Natural Science Foundation of Jiangxi Province, China;Project(GJJ 08006) supported by the Science & Technology Program of Education Department of Jiangxi Province, China

摘　　要：The microstructure characteristics and mechanical properties of 2024 wrought aluminum alloy produced by a new rheoforming technique under as-cast and optimized heat treatment conditions were investigated. The present rheoforming combined the independently developed rheocasting process, named as LSPSF (low superheat pouring with a shear field) process, and the existing squeeze casting process. The experimental results show that LSPSF can be used to prepare sound semi-solid slurry within 25 s to fully meet the production rate of squeeze casting. The primary α(Al) presents in mean equivalent diameter of 69 μm and shape factor of 0.76, and features zero-entrapped eutectics. Compared with conventional squeeze casting, the present LSPSF rheoforming can improve the microstructures and mechanical properties. An optimized heat treatment results in substantial reduction of microsegregation and significant improvement of mechanical properties, such as yield strength of 321 MPa, ultimate tensile strength of 428 MPa and elongation of 12%.The microstructure characteristics and mechanical properties of 2024 wrought aluminum alloy produced by a new rheoforming technique under as-cast and optimized heat treatment conditions were investigated. The present rheoforming combined the independently developed rheocasting process, named as LSPSF （low superheat pouring with a shear field） process, and the existing squeeze casting process. The experimental results show that LSPSF can be used to prepare sound semi-solid slurry within 25 s to fully meet the production rate of squeeze casting. The primary a（A1） presents in mean equivalent diameter of 69 ~rn and shape factor of 0.76, and features zero-entrapped eutectics. Compared with conventional squeeze casting, the present LSPSF rheoforming can improve the microstructures and mechanical properties. An optimized heat treatment results in substantial reduction of microsegregation and significant improvement of mechanical properties, such as yield strength of 321 MPa, ultimate tensile strength of 428 MPa and elongation of 12%.

关 键 词：半固体 铸造程序 铝合金 微结构 

分 类 号：TG146.21[一般工业技术—材料科学与工程]