Multiple ballistic impacts on 2024-T4 aluminum alloy by spheres: Experiments and modelling

被引：15
作者：
Cheng, J. C. [1 ]
Zhao, S. P. [2 ]
Fan, D. [2 ]
Chai, H. W. [2 ]
Ye, S. J. [1 ]
Li, C. [1 ]
Luo, S. N. [1 ]
Cai, Y. [2 ]
Huang, J. Y. [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu, Sichuan, Peoples R China
[2] Peac Inst Multiscale Sci, Chengdu, Sichuan, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 94卷
关键词：
2024Al-T4; alloy; Multiple impacts; Twin-like deformation band; Deformation twinning; Finite element method; AL; MICROSTRUCTURE; PENETRATION; PROJECTILES; COMPOSITES; BEHAVIOR; CRATERS; DAMAGE; SPALL; DEFORMATION;
D O I：
10.1016/j.jmst.2021.04.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Multiple ballistic impacts are carried out on a 2024-T4 aluminum alloy by spherical steel projectiles (5-mm diameter) at similar to 400 m s(-1), to investigate its dynamic deformation and damage. The ballistic impact process is captured with high-speed photography. Postmortem samples are characterized with optical imaging, three-dimensional laser scanning, microhardness testing and electron backscatter diffraction. With increasing number of impacts, crater diameter increases slightly, but crater depth and crater volume increase significantly, and strain accumulation leads to microhardness increase overall. Crater parameters all follow power-law relations with the number of impacts. Twin-like deformation bands and macroscopic deformation twins are produced by impact as a result of spontaneous dislocation self-pinning under high strain rate, large shear deformation. Under multiple impacts, shear strain accumulation in the arc-shaped region of the crater induces deformation twinning when it exceeds a critical value (similar to 1.1 - 1.6). It is highly possible that the deformation twins are related to deformation bands, since they both share one set of the{111} pole with the initial matrix grain. A finite element method model is optimized to reproduce experimental observations and interpret deformation mechanisms. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.
引用
收藏
页码：164 / 174
页数：11
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