Effects of prior ECAP process on the dynamic impact behaviors of hypereutectic Al-Si alloy

被引：23
作者：
Damavandi, Esmaeil [1 ]
Nourouzi, Salman [1 ]
Rabiee, Sayed Mahmood [1 ]
Jamaati, Roohollah [1 ]
Tiamiyu, Ahmed A. [2 ]
Szpunar, Jerzy A. [2 ]
机构：
[1] Babol Noshirvani Univ Technol, Dept Mat Sci & Engn, Babol, Iran
[2] Univ Saskatchewan, Dept Mech Engn, Saskatoon, SK, Canada
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 793卷
关键词：
Hypereutectic Al-Si alloy; Dynamic mechanical behavior; Adiabatic shear band; Kernel average misorientation; Equal channel angular pressing (ECAP); Thermal softening; HIGH-STRAIN-RATE; AUSTENITIC STAINLESS-STEEL; HOPKINSON PRESSURE BAR; ADIABATIC SHEAR BANDS; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; MICROSTRUCTURE EVOLUTION; PLASTIC-DEFORMATION; TEXTURE EVOLUTION; FRACTURE-BEHAVIOR;
D O I：
10.1016/j.msea.2020.139902
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The dynamic mechanical responses of as-cast and ECAPed hypereutectic Al-Si alloy subjected to high strain rate compression by split Hopkinson pressure bar (SHPB) system were investigated. The result shows that the dynamic yield strength of the investigated alloy first decreases with the first ECAP pass, followed by an increase in strength with further increase in ECAP passes. Increasing the number of ECAP passes also results in the refinement of both grains and deleterious crack-nucleating particles and in turn, results in the decrease in susceptibility to thermo-mechanical instability and formation of adiabatic shear bands (ASBs). The activation of dynamic recovery (DRV) and dynamic recrystallization (DRX) by increasing the number of ECAP passes were found to significantly suppress dynamic mechanical damage.
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页数：16
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