Strain rate sensitivity of the commercial aluminum alloy AA5182-O
Strain rate sensitivity of the commercial aluminum alloy AA5182-O
复制标题
DOI：
10.1016/j.msea.2004.08.029
复制
发表时间：
2005-01-15
期刊：
影响因子：
6.4
通讯作者：
Maniatty, AM
中科院分区：
文献类型：
--
作者：
Picu, RC;Vincze, G;Maniatty, AM
研究了商用铝合金AA5182-O在-120 ~ 150℃温度和10(-6)~ 10(-1)s（-1）应变速率下的力学行为。将应变率灵敏度参数确定为温度和塑性应变的函数，绘制出动态应变老化导致负应变率灵敏度的应变率和温度范围。研究了动态应变时效对塑性和应变硬化的影响。讨论了测量量对实验方法的敏感性及其与晶粒形状的依赖关系。实验数据与基于最近提出的动态应变老化机制建立的模型的预测结果进行了比较。其机制是基于森林位错处溶质聚集对位错连接处强度的影响。该模型定性地再现了实验趋势。(C) 2004 Elsevier B.V.版权所有
The mechanical behavior of the commercial aluminum alloy AA5182-O is investigated at temperatures ranging from -120 to 150degreesC and strain rates from 10(-6) to 10(-1) s(-1). The strain rate sensitivity parameter is determined as a function of temperature and plastic strain, and the strain rate and temperature range in which dynamic strain aging leads to negative strain rate sensitivity is mapped. The effect of dynamic strain aging on ductility and strain hardening is investigated. The sensitivity of the measured quantities to the experimental method employed and their dependence on grain shape are discussed. The experimental data are compared with the predictions of a model constructed based on a recently proposed mechanism for dynamic strain ageing. The mechanism is based on the effect solute clustering at forest dislocations has on the strength of dislocation junctions. The model is shown to reproduce qualitatively the experimental trends. (C) 2004 Elsevier B.V. All rights reserved.