摘要
分别采用Al-Ti-B和Al-0.04Sr对铸造Al7Si Mg合金进行变质处理,研究了传统浇注工艺、空冷至低温浇注和激冷至低温浇注工艺下合金的显微组织与力学性能变化规律。结果表明,Al-5Ti-1B和Al-0.04Sr变质处理的Al7Si Mg合金不同浇注工艺下晶粒尺寸从大至小依次为:730℃浇注>空冷至650℃浇注>激冷至650℃浇注,激冷至低温进行处理可以获得最好的变质效果;随着激冷至低温温度的降低,合金的抗拉强度、屈服强度和断后伸长率有逐渐降低趋势;Al-5Ti-1B和Al-0.04Sr变质处理的Al7Si Mg合金的抗拉强度相当,但是后者的塑性较好。
Al7SiMg casting alloy was modified by Al-Ti-B and Al-0.04Sr respectively. The microstructure and mechanical properties of the alloy with traditional casting, air cooling to low temperature and chilling to low-temperature casting processes, were studied. The results show that, the grain size of different casting processes for Al7SiMg alloy with Al-5Ti-IB and Al-0.04Sr modification, from big to small is as follows： 730 ℃ pouring 〉 air cooled to 650 ℃ pouring 〉 chilling to 650 ℃ pouring, chilling to the low-temperature treatment can obtain the best modification effect; with decreasing quench to cryogenic temperature, the tensile strength, yield strength and elongation decrease gradually. The tensile strength of Al7SiMg alloy with Al-5Ti-IB and Al-0.04Sr modification is equivalent, but the latter one has better plasticity.
出处
《热加工工艺》
CSCD
北大核心
2015年第23期109-112,共4页
Hot Working Technology
