摘要
研究了中间退火温度对多道次冷轧Al-Mg-Sc-Zr合金力学性能的影响.结果表明:在各道次轧制前采用400℃/1h中间退火,合金强度无明显变化;采用450℃/1h中间退火,合金强度随加工次数增加而明显降低.对其机理分析表明,冷变形产生的高密度位错等缺陷在较高温度的中间退火过程中为Sc和Zr原了提供了快速扩散的通道,促进了Al_3(Sc,Zr)相颗粒的粗化.Al_3(Sc、Zr)颗粒的粗化不但使其阻碍位错运动的能力降低,而且还削弱了其对回复进程的抑制作用.两种因素的共同作用导致了退火态合金强度的下降.
Influence of intermediate annealing temperatures on the strength of repeatedly cold- rolled Al-Mg-Sc-Zr alloy was investigated. It is indicated that the strength of the alloy has no obvious change with intermediate annealing at 400℃ for 1 h, but it decreases significantly with the increase of rolling passes after intermediate annealing at 450℃ for 1 h, especially for the yield stress. High density of dislocations induced by cold-rolling will provide a fast diffusion path for Sc and Zr atoms and promote coarsening of the Al3（Sc, Zr） particles when samples are annealed at higher temperature. As a result, Al3（Sc, Zr） particles have weak abilities to hinder the movement of dislocations and recovery Drocess of the alloy, which make the strength of the alloy decrease.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期1209-1212,共4页
Acta Metallurgica Sinica
作者简介
杜刚，男，1981年生，硕士
