Acoustic emission during stress relaxation of pure magnesium and AZ magnesium alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:462

Article; Proceedings Paper

Dobron, Patrik ; Bohlen, Jan ; Chmelik, Frantisek ; Lukac, Pavel ; Letzig, Dietmar ; Kainer, Karl Ulrich

关键词: acoustic emission;    stress relaxation;    magnesium alloys;    Kaiser effect;   

DOI  :  10.1016/j.msea.2005.12.111

来源: Elsevier

【 摘 要 】

Acoustic emission was monitored and analysed during tensile tests of pure Mg and Mg alloys of the AZ series in order to study the influence of alloy composition on plastic deformation. The Kaiser effect was used to determine the stability of the microstructure. During the tests at room temperature, repeated stress relaxations were performed. The solute-dislocation interaction in the alloys leads to ageing phenomenons, which manifest themselves in a post-relaxation effect and subsequent serrated flow (Portevin-Le Chatelier effect). The post-relaxation effect was sensitive to alloy composition and the strain at which the stress relaxation was performed. (C) 2006 Elsevier B.V. All rights reserved.

【 授权许可】

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