稀土铒(Er)对挤压Al-0.8Mg-0.6Si合金组织与性能的影响  

Influence of rare earth element Er on microstructure and mechanical properties of extruded Al-0.8Mg-0.6Si alloy

作　　者：孙雪盼[1] 陈立佳[1] 车欣[1] 王鑫[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《金属热处理》2011年第2期25-28,共4页Heat Treatment of Metals

基　　金：辽宁省自然科学基金(20072046)

摘　　要：针对挤压态以及经过固溶+人工时效(T6)处理的挤压变形Al-0.8Mg-0.6Si-xEr合金的显微组织和拉伸性能进行了研究。结果表明,适量Er的加入,可以细化挤压态Al-0.8Mg-0.6Si-xEr合金的组织,其中当Er含量为0.3%时,细化效果最明显,且挤压态Al-0.8Mg-0.6Si-xEr合金的抗拉强度和屈服强度最高。经过T6处理后,含Er合金的显微组织与挤压态合金相比有一定程度的粗化,但挤压变形Al-0.8Mg-0.6Si-xEr合金的抗拉强度和屈服强度显著提高,这是由于合金在T6处理后析出了弥散的次生Al3Er第二相粒子。拉伸断口分析表明,挤压态Al-0.8Mg-0.6Si-xEr合金发生典型的韧性断裂,而经过T6处理后Al-0.8Mg-0.6Si-xEr合金则发生以韧性断裂为主的韧脆混合断裂。Microstructure and tensile properties of Al-0.8Mg-0.6Si-xEr aluminium alloys under as-extruded state and after solution plus artificial aging（T6） treatment were studied.The results reveal that with addition of erbium,microstructure of the extruded Al-0.8Mg-0.6Si-xEr aluminium alloys is refined,especially with erbium of 0.3%,the tensile strength and yield strength are improved effectively.After T6 treatment,the microstructure of the alloys with erbium is slightly coarse compared with that of the as-extruded alloy,but the strength is improved remarkably due to the precipitation of dispersion secondary phase of Al3Er after T6 treatment.Tensile fractography indicates that the extruded Al-0.8Mg-0.6Si-xEr alloys perform ductile fracture,while Al-0.8Mg-0.6Si-xEr alloys after T6 treatment perform ductile-brittle mixed but mainly ductile fracture.

关 键 词：铝合金 稀土元素ER 显微组织 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]