Dynamic Strength of Submicrocrystalline and Nanocrystalline Copper Obtained by High-Strain-Rate Deformation

被引:6
|
作者
Khomskaya, I., V [1 ]
Razorenov, S., V [2 ,3 ]
Garkushin, G., V [2 ,3 ]
Shorokhov, E., V [4 ]
Abdullina, D. N. [1 ]
机构
[1] Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620108, Russia
[2] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia
[3] Natl Res Tomsk State Univ, Tomsk 634050, Russia
[4] Zababakhin Sci Res Inst Tech Phys, Russian Fed Nucl Ctr, Snezhinsk 456770, Chelyabinsk Obl, Russia
来源
PHYSICS OF METALS AND METALLOGRAPHY | 2020年 / 121卷 / 04期
关键词
copper; submicrocrystalline and nanocrystalline structure; high-strain-rate deformation; shock compression; dynamic elastic limit; spall strength; MECHANICAL-PROPERTIES;
D O I
10.1134/S0031918X20040067
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The dynamic properties of commercial copper (99.8 wt % purity) with a submicrocrystalline and nanocrystalline structure obtained by high-strain-rate deformation using the dynamic channel-angular pressing (DCAP) method have been studied in this work. The tests were carried out under conditions of shock compression at a pressure of 5.6-6.8 GPa at a strain-rate of (0.9-2.0) x 10(5) s(-1). The analysis of the evolution of the structure and mechanical properties, namely, the dynamic elastic limit, dynamic yield stress, and the spall strength of copper before and after DCAP in different regimes, made it possible to evaluate the influence of the dispersity and imperfection of the crystal structure on its resistance to the high-strain-rate deformation and fracture. It has been shown that the grain refinement from 100 to 0.5-1.0 mu m increased the dynamic elastic limit and the dynamic yield stress of copper by six times, but only slightly decreased the spall strength. The further refinement of the structure (up to 0.05-0.40 mu m) increases the spall strength of copper by 1.4 times as compared to its value in the initial coarse-grained state.
引用
收藏
页码:391 / 397
页数:7
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