A combination of severe plastic deformation and ageing phenomena in Al–Mg–Si Alloys
A combination of severe plastic deformation and ageing phenomena in Al–Mg–Si Alloys
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DOI：
10.1016/j.matdes.2011.12.014
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发表时间：
2012-04
影响因子：
8.4
通讯作者：
M. Vaseghi;Hyoung-Seop Kim
中科院分区：
文献类型：
--
作者：
M. Vaseghi;Hyoung-Seop Kim
研究了Al-Mg-Si合金在等径角挤压（ECAP）条件下的静态和动态应变时效行为。为了研究塑性变形、固溶处理和时效组合对强化特性的影响，比较了ECAP模具内部无ECAP时效、预ECAP时效、后ECAP时效和动态时效的实验结果。重点讨论了时效温度、时效时间、ECAP中应变速率、热处理顺序和ECAP对合金维氏硬度的影响。为了获得更高的硬度，在现有研究成果的基础上，提出了一种结合ECAP工艺的最佳时效周期。通过采用所提出的方案，硬度值从86 HV（溶态处理）提高到138 HV（当前方案的峰值硬度）。
In this paper static and dynamic strain ageing behavior in Al–Mg–Si alloys related to equal channel angular pressing (ECAP) was investigated. In order to examine the combined plastic deformation, solution treatment and ageing effects on strengthening characteristics, experimental results of ageing without ECAP, pre-ECAP ageing, post-ECAP ageing and dynamic ageing inside of ECAP die were compared. In particular, the effects of ageing temperature, ageing time, strain rate in ECAP, and sequence of heat treatment and ECAP on Vickers hardness were discussed. To achieve a higher hardness, an optimum ageing cycle combined with ECAP process is presented based on the results of current study. By employing the proposed schedule the hardness value was increased from 86 HV (as-solution treatment) to 138 HV (peak hardness of the current schedule).