摘要
以水泵盖为目标零件,在自行建立的半固态触变成形试验线上使用A357合金和新开发的半固态专用铝合金Al-6Si-2Mg进行了半固态触变压铸试验研究。对这两种合金在半固态坯料制备、二次加热及半固态压铸中的显微组织及工艺性进行了比较。结果表明,Al-6Si-2Mg合金在触变成形过程中均表现出更好的工艺可控性,其半固态压铸件热处理后的性能为σb=335MPa,σs=305MPa,δ5=3%,强度高于A357,伸长率与铸态A357合金相当。试验最终获得了充型完好、性能优异、组织均匀的半固态压铸件。
We have developed a thixoforming pilot-plant-scale equipment to perform semi-solid thixoforming for pump lid using A357 alloy and a new developed Al-6Si-2Mg alloy.The microstructure and mechanical properties of the two alloys were compared during the process of SSM billets preparation,reheating and semi-solid die casting.It was revealed that the Al-6Si-2Mg alloy exhibits better processing controllability during thixoforming compared with the A357 alloy.The properties of heat treated components by semi-solid thixoforming is tensile strength of 335 MPa,yield strength of 305 MPa and elongation of 3%[WT],higher than A357 alloy in strength,equal to A357 alloy in elongation.Finally,auto parts produced by semi-solid die casting with ideal filling,excellent properties and uniform microstructure were achieved.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第8期504-506,共3页
Special Casting & Nonferrous Alloys
基金
国家863计划资助项目(2002AA336080)
关键词
半固态金属
电磁搅拌
二次加热
触变压铸
Semi-solid Metal,Electromagnetic Stirring,Reheating,Thixoforming
