The Portevin –Le Chatelier Effect and Acoustic Emissionof Plastic Deformation CuZn30 Monocrystals

Archives of Metallurgy and Materials

W. Ozgowicz¹  B. Grzegorczyk¹  Z. Ranachowski²  A. Piatkowski³  A. Pawełek³ 

[1] INSTITUTE OF ENGINEERING MATERIALS AND BIOMATERIALS OF THE SILESIAN UNIVERSITY OF TECHNOLOGY, 18A KONARSKIEGO STR., 44-100 GLIWICE, POLAND;INSTITUTE OF FUNDAMENTAL TECHNOLOGICAL RESEARCH POLISH ACADEMY OF SCIENCES, 5B PAWINSKIEGO STR., 02-106 WARSAW, POLAND;INSTITUTE OF METALLURGY AND MATERIALS SCIENCE OF POLISH ACADEMY OF SCIENCES, 25 REYMONTA STR., 30-059 KRAKÓW, POLAND

关键词: Keywords: plastic strain;    Portevin - Le Chatelier effect (PLC);    monocrystals;    copper alloys;    compression test;    acoustic emission (AE);   

DOI  :  10.2478/amm-2014-0029

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The paper presents the investigation of the relation between the acoustic emission (AE) and instability of plastic deformation type Portevin-Le Chatelier (PLC) of single-phase brass CuZn30 monocrystals with crystallographical orientation [1¯3 9]. The monocrystals have been investigated applying the method of free compression at a constant strain rate and the temperature within the range from 200°C to 400°C, simultaneously recording PLC phenomenon by means of acoustic emission. During hot axial compression tests the correlation between work-hardening curves σ - ε, which display PLC effect and characteristic of acoustic emission signals has been found. Moreover, it was proved that in the range of the PLC effect, the acoustic signal is an impulse a character of cyclic repeatability, distinctly correlated qualitatively with the stress oscillations on the curves σ - ε. The analysis of the obtained results leads to the conclusion that in the tested monocrystals the effect PLC is probably controlled by complex processes similar to the phenomenon of dynamic strain ageing (DSA), which are described by diffusion models.

【 授权许可】

Unknown