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高纯多晶铝的动态再结晶 被引量:8

Dynamic Recrystallization of High Purity Polycrystalline Aluminum
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摘要 将99.992%高纯多晶铝在533~773K时以0.002~2.000s-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。 Specimens of high purity Aluminum of 99.992% grade were hot compressed to a true strain of 0.92 at 533773 K and with strain rates of 0.0022.000 s^(-1). The dynamic restoration mechanisms were examined by the true stress-true strain curves, polarized microscopy and transmission electron microscopy. The effect of parameter Z (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 parameter Z is low. But the true stress-true strain curve does not accompany stress oscillation when discontinuous dynamic recrystallization occurs.
出处 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2004年第6期935-940,共6页 Journal of Central South University:Science and Technology
基金 国家重点基础研究发展规划项目(G1999064908)
关键词 高纯铝 Zenner-Hollomon参数 高温变形 再结晶 high purity aluminum Zenner-Hollomon parameter hot deformation recrystallization
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参考文献16

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