Influence of solute cloud and precipitates on spatiotemporal characteristics of Portevin-Le Chatelier effect in A2024 aluminum alloys  

作　　者：孙亮 张青川 曹鹏涛 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China

出　　处：《Chinese Physics B》2009年第8期3500-3507,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos 10872189 and 10732080)

摘　　要：In this paper, solute concentration and precipitate content in A2024 aluminum alloy are adjusted by solution treatment （ST） at different temperatures and tensile experiments on these treated specimens are carried out. It is found that the temperature of solution treatment （ST temperature） has a remarkable influence on the amplitude of the serrated flow and the propagation characteristics of shear bands. These results are due to the effects of solute atoms and precipitates on dynamic strain aging （DSA）. When ST temperature is higher than 300 ℃, solute concentration is relatively high and solute cloud is a key factor of DSA. When ST temperature is lower than 300 ℃, precipitate content is relatively high and the mechanism of DSA is determined by precipitates.In this paper, solute concentration and precipitate content in A2024 aluminum alloy are adjusted by solution treatment （ST） at different temperatures and tensile experiments on these treated specimens are carried out. It is found that the temperature of solution treatment （ST temperature） has a remarkable influence on the amplitude of the serrated flow and the propagation characteristics of shear bands. These results are due to the effects of solute atoms and precipitates on dynamic strain aging （DSA）. When ST temperature is higher than 300 ℃, solute concentration is relatively high and solute cloud is a key factor of DSA. When ST temperature is lower than 300 ℃, precipitate content is relatively high and the mechanism of DSA is determined by precipitates.

关 键 词：aluminum alloy Portevin-Le Chatelier effect dynamic strain aging solution treatment precipitate particle 

分 类 号：O481[理学—固体物理]