高纯多晶铝的动态再结晶

来源期刊：中南大学学报(自然科学版)2004年第6期

论文作者：蒋树农 刘楚明 李慧中 张新明

文章页码：935 - 940

关键词：高纯铝; Zenner-Hollomon参数;高温变形;再结晶

Key words：high purity aluminum; Zenner-Hollomon parameter; hot deformation; recrystallization

摘    要：将99.992%高纯多晶铝在533~773 K时以0.002~2.000 s^-1的应变速率压缩到其真应变为0.92。采用真应力-真应变曲线以及偏光金相和透射电镜研究高纯铝高温塑性变形特征,研究了形变条件对高纯铝动态软化机制的影响。研究结果表明:高纯铝的动态软化机制与Zenner-Hollomon参数Z密切相关,当Z较大时,试样仅发生动态回复;Z处于中间值时,发生连续动态再结晶;Z较小时,发生不连续动态再结晶,但真应力-真应变曲线未出现波动。

Abstract: Specimens of high purity Aluminumof 99.992% grade were hot compressed to a true strain of 0.92at 533-773 K and with strain rates of 0.002-2.000 s^-1. The dynamic restoration mechanisms were examined by the true stress-true strain curves, polarized microscopy and transmission electron microscopy. The effect of parameterZ(Zener-Hollomom parameter) on the restoration mechanisms of high purity aluminum was investigated. The results show that only dynamic recovery occurs when parameter Z is high; continuous dynamic recrystallization occurs when parameter Z is intermediate, and discontinuous dynamic recrystallization takes place if parameterZis low. But the true stress-true strain curve does not accompany stress oscillation when discontinuous dynamic recrystallization occurs.