Al—Li单晶体锯齿流变的产生机制  

MECHANISM FOR THE OCCURRENCE OF SERRATED FLOW IN Al-Li SINGLE CRYSTALS

作　　者：田宝辉[1] 李焕喜[2] 张永刚[2] 陈昌麒[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]北京航空航天大学,北京100083

出　　处：《金属学报》1998年第6期603-608,共6页Acta Metallurgica Sinica

基　　金：四川省青年科学基金!925010

摘　　要：不同时效状态下Al—Li单晶体应变速率敏感性的变化不同．单个锯齿的应力幅度防应变的增加不规则变化，和锯齿的经历时间无关；锯齿的应力幅度和经历时间在峰值时效状态主要分布在较小值的范围内．这些变化可以用切割δ＇粒子产生锯齿流变解释．Strain rate sensitivity varies in a different mariner in Al-Li single crystalsunder different ageing conditions. Stress drops change irregularly with increasing strain andbear no relation to elapsed time for individual serrations. Stress drops and elapsed time duringserrated flow Primarily distribute within their low values under peak aged condition, comparedwith underaged and overaged states. These behaviors may be explained by sheared σ＇ particlesinducling serrated flow.

关 键 词：应变速率敏感性 应力幅度 锯齿流变 铝锂合金 

分 类 号：TG111[金属学及工艺—物理冶金] TG146.2[金属学及工艺—金属学]