摘要
在A357铝合金熔体中分别加入自制的Al-5Ti-1B-9Sr、Al-5Ti-1B-10Sr和Al-5Ti-1B-11Sr细化变质剂,研究了这三种细化变质剂对A357铝合金显微组织和力学性能的影响。借助于扫描电镜(SEM)、电子探针X射线显微分析(EPMA)等技术分析了加入细化变质剂前后的A357铝合金的微观组织,并对加入细化变质剂前后A357铝合金进行拉伸力学性能试验。结果表明:向A357铝合金中分别添加质量分数0.2%的Al-5Ti-1B-9Sr、Al-5Ti-1B-10Sr和Al-5Ti-1B-11Sr细化变质剂,A357铝合金的抗拉强度分别达到309.18 N/mm2、328.06 N/mm2和314.61 N/mm2;向A357铝合金中分别添加质量分数0.1%,0.2%,0.3%和0.4%的Al-5Ti-1B-10Sr细化变质剂,A357铝合金的抗拉强度分别为326.91 N/mm2、328.06 N/mm2、324.70和296.89 N/mm2,伸长率分别为3.1%、6.4%、3.1%和0.2%。
The effect of Al-5Ti-1B-9Sr, Al-STi-1B-10Sr and Al-5 Ti-1B-11Sr on the micro-structure and mechanical properties of A357 aluminum alloy were researched. The micro-structure of A357 aluminum alloy before and after being refined was observed by electron probe micro-analyzer （EPMA） and scanning electron microscopy （SEM）. The tensile me-chanical properties of A357 aluminum alloy were tested before and after being refined. It was found that the tensile strength of A357 aluminum alloy reached 309. 18 N/mm^2, 328.06 N/mm^2 and 314.61 N/mm^2 with addition of 0. 2% （mass fraction） Al-5Ti-IB-9Sr,Al-5Ti-1B-10Sr and A1-5Ti-IB-11Sr. The tensile strength of the A357 aluminum alloy respectively reached 326.91 N/mm^2 ,328.06 N/mm^2 ,324.70 N/mm^2 and 296.89 N/mm^2 ,and the elon-gation respectively reached 3.1%, 6.4%, 3.1% and 0.2% with the addition of 0.1%,0. 2% ,0.3% ,and 0.4% （mass fraction） Al-5Ti-1B-10.0St.
出处
《轻合金加工技术》
CAS
北大核心
2014年第3期28-31,共4页
Light Alloy Fabrication Technology
基金
国家国际科技合作专项项目(2012DFA50630)
关键词
细化变质剂
A357铝合金
合金组织
力学性能
refinement modifier
A357 aluminum alloy
microstructure
mechanical properties
