摘要
Based on the investigation of mechanical response and microstructure evolution of a commercial 7003 aluminum alloy under high-speed impact,a new simple and effective method was proposed to determine the critical strain required for the nucleation of adiabatic shear band(ASB).The deformation results of cylindrical and hat-shaped samples show that the critical strain required for ASB nucleation corresponds to the strain at the first local minimum after peak stress on the first derivative curve of true stress−true strain.The method of determining the critical strain for the nucleation of ASB through the first derivative of the flow stress curve is named the first derivative method.The proposed first derivative method is not only applicable to the 7003 aluminum alloy,but also to other metal materials,such as commercial purity titanium,WY-100 steel,and AM80 magnesium alloy.This proves that it has strong universality.
基于对商用7003铝合金在高速冲击下的力学响应和显微组织演变的研究,提出一种简单有效的新方法来确定绝热剪切带(ASB)成核所需的临界应变。圆柱形和帽形样品的变形结果表明,ASB成核的临界应变对应真应力-真应变的一阶导数曲线上峰值应力后的第一个局部最小值。将这种通过流动应力曲线的一阶导数确定ASB成核临界应变的方法命名为一阶导数法。所提出的一阶导数法不仅适用于7003铝合金,也可用于其他金属材料,如商业纯钛、WY-100钢和AM80镁合金等。这证明一阶导数法具有很强的普适性。
基金
National Natural Science Foundation of China (No. U20A20275)
Natural Science Foundation of Hunan Province,China (No. 2021JJ40096)。
作者简介
Corresponding author:Luo-xing LI,Tel:+86-731-88821950,E-mail:luoxing_li@hnu.edu.cn。
