触变模锻半固态A356铝合金的组织与力学性能  

Microstructure and Mechanical Properties of Thixoforged Semi-solid A356 Aluminum Alloy

作　　者：王顺成[1] 蔡畅[1] 戚文军[1] 郑开宏[1] 李伟东[1,2] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院)金属成型与加工技术研究所,广东广州510650 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2012年第11期15-18,共4页Hot Working Technology

基　　金：广州有色金属研究院科技创新基金项目(2009A010)

摘　　要：采用低温浇注和晶粒细化复合工艺制备半固态A356铝合金坯料,并在200T立式油压机上对半固态坯料进行触变模锻成形,研究了触变模锻件的组织与力学性能,并与液态模锻件进行了比较。结果表明:触变模锻件内部组织由球形α-Al晶粒和α+Si共晶组织组成,组织均匀致密,经T6热处理后抗拉强度和伸长率分别为317.6MPa和5.8%,比液态模锻件分别提高了13.6%和5.1%,表明触变模锻半固态A356铝合金件具有较好的热处理强化效果和较高的综合力学性能。The semi-solid A356 aluminum alloy billets were prepared by the composite technology of low temperature casting and adding grain refiner and thixoforged in 200T oil press.The microstructures and mechanical properties of thixoforged products were investigated and compared with that of liquid forged products.Results show that the thixoforged products with spherical α-Al grains and α＋Si eutectic can be obtained and its tensile strength and elongation with T6 treatment are 317.6 MPa and 5.8% repectively,which are increased by 13.6% and 5.1% compared with that of liquid forged products.It is suggested that the thixoforged products have a good aging strengthening and comprehensive mechanical properties.

关 键 词：半固态金属 触变模锻 低温浇注 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]