High-Speed In Situ Study of the Correlation between the Deformation Bands Formation and Acoustic Response in Al-Mg Alloy

被引：2

作者：

Shibkov, A. A. ^{[1
]}

Gasanov, M. F. ^{[1
]}

Zolotov, A. E. ^{[1
]}

Denisov, A. A. ^{[1
]}

Kochegarov, S. S. ^{[1
]}

Koltsov, R. Y. ^{[1
]}

机构：

[1] Derzhavin Tambov State Univ, Tambov 392000, Russia

来源：

CRYSTALLOGRAPHY REPORTS | 2020年 / 65卷 / 04期

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

PLASTIC-DEFORMATION; PORTEVIN; EMISSION; FLOW; DYNAMICS; PATTERN; GROWTH; STRAIN; CREEP;

D O I：

10.1134/S1063774520040185

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The dynamics of deformation bands in Al-Mg alloy has been investigated synchronously in situ by two methods: acoustic emission (AE) and high-speed (20000 fps) video recording of a sample surface deformed at a specified stress rate. It is established that a band nucleates at a random site on the lateral surface of planar sample and grows in the form of a needle-shaped embryo band at an angle of about 60 degrees with respect to the extension axis, with a tip velocity of up to similar to 10 m/s. The embryo-band nucleation, growth, and outcrop onto the opposite lateral surface is accompanied by generation of a broadband AE signal in the frequency range of similar to 10(2)-10(6) Hz. The low-frequency component of the AE signal in the range of similar to 0.1-1 kHz is related to the macroscopic band behavior, and the high-frequency component in the range of similar to 0.1-1 MHz contains data on the mesoscopic events, related to jumps in the velocity of embryo-band tip and its outcrop onto the external sample surface. The mechanisms of AE signal generation have been discussed.

引用

页码：546 / 553

页数：8

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