Al-0.2Sc-0.04Zr合金的高温蠕变行为  

High Temperature Creep Behavior of Al-0.2Sc-0.04Zr Alloys

作　　者：蔡彬[1] 李卫杰[1] 周伟伟[1] 李金文[1] 李志华[1] 李卫华[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室

出　　处：《特种铸造及有色合金》2014年第2期113-115,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51371160);中国教育部留学回国科研启动资金资助项目

摘　　要：在前期工作基础上,研究了经不同冷轧和时效处理的Al-0.2Sc-0.04Zr合金在300℃时的蠕变行为。发现合金的高温蠕变属于第二相粒子强化材料的蠕变,存在蠕变门槛应力,且冷轧和时效联合处理能进一步改善合金高温抗蠕变能力。虽然预时效+冷轧+再时效处理可获得更好的室温抗拉强度,但未经预时效的冷轧+时效处理却可获得好的高温抗蠕变性能。显微组织观察表明,Al-0.2Sc-0.04Zr合金抗蠕变性能的改善与晶粒细化和共格Al3(Sc,Zr)沉淀相的形成及分布有关。Based on previous work,the creep behavior of Al-0.2Sc-0.04Zr alloys at 300℃after different cold-rolling and ageing treatments was investigated.It is found that the creep behavior of Al-0.2Sc-0.04Zr alloys belongs to the creep behavior of the secondary phase precipitate-strengthening materials,meanwhile,the threshold stress exists during creep,furthermore,the combination treatment of cold-rolling and ageing can increase the high temperature creep resistance.Although a better tensile strength can be obtained by pre-ageing＋cold-rolling＋re-ageing for the alloy,much better creep resistance at high temperature can be obtained by cold-rolling＋ageing for the alloy.Microstructure observation reveals that the improvement of creep resistance of Al-0.2Sc-0.04Zr alloys at high temperature is relevant with the grain refinement,the formation and distribution of coherent Al3（Sc,Zr）precipitates.

关 键 词：Al-Sc-Zr合金 蠕变 门槛应力 

分 类 号：TG146.21[一般工业技术—材料科学与工程]