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时效对LC9铝合金锯齿流变的影响

吴敏 , 徐约黄 , 沈功田

金属学报

研究了LC9铝合金经退火、淬火,及不同条件时效处理后的锯齿流变行为开始出现锯齿的临界应变ε_c随着时效加深而后移,从而测得过程的激活能为0.63eV,与空位在Al中的扩散激活能吻合。时效试样与退火试样不同,应变率ε增大,ε_c反而减小;而退火试样的ε_c则随ε而增大。说明退火试样的锯齿流变是形变空位控制的,而时效试样则是淬火空位控制的。若时效时间加长,锯齿由较为整齐的脱钉型变为明显衰减的钉扎型。锯齿密度也因时效而稍许减小。用位错与溶质原子及GP区的作用对以上现象进行了解释。

关键词: 锯齿流变 , Cottrell atmosphere , aging , pinning and unpinning

体心立方金属中位错与间隙原子相互作用的回顾--机械波谱术研究

金属学报 doi:10.3321/j.issn:0412-1961.2003.11.006

根据有关术语、实验结果和理论处理方法的现有数据,对冷加工峰,200,220或250℃峰,Snoek-Koster(SK)峰,以及Snoek-Ke-Koster(SKK)峰进行了评估.并特别强调了葛庭燧教授(Ke)为理解冷加工峰所作的贡献.同时,对由(1)Schoeck,(2)Seeger,(3)王业宁等人,(4)Magalas 和Ngai,以及(5)Ogurtani等人发展的现有理论模型进行了简要的综述.

关键词: Snoek-Koster峰 , 冷加工峰 , Snoek弛豫 , Cottrell气团 , 葛庭燧 , 内耗 , 机械波谱学 , 位错 , 固溶体 , , ,

INFLUENCE OF AGING ON SERRATED FLOW OF ALUMINUM ALLOY LC9

WU Min XU Yuehuang SHEN Gongtian Wuhan University , Wuhan , China

金属学报(英文版)

The serratedflow of alloy LC9 with different regimes of heat treatment has been investigated at constant rate of stretching.The critieal strain ε_c at the starting of serrated flow increases with the extension of aging.The activation energy of the process is 0.63 e V which is consistent with the diffusion activation energy of vacancies in A1.The ε_c decreases while the strain rate ε increases,i.e.,with negative strain rate relation.This relation is contrary to that of the an- nealed samples.It shows that the serrated 17ow of annealed sample is controlled by deformation vaeancies,and that of aged sample is controlled by quenching vacancies.The den- sity and shape of the serration are changed by aging.The mechanism of the above mentioned results is discussed.

关键词: serratedflow , null , null , null

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