Acoustic emission study on the activity of slip and twin mechanisms during compression testing of magnesium single crystals

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

卷:650

Article

Drozdenko, Daria¹  Bohlen, Jan²  Chmelik, Frantisek¹  Lukac, Pavel¹  Dobron, Patrik¹ 

[1] Charles Univ Prague, Dept Phys Mat, Prague 12116 2, Czech Republic

[2] Zentrum Mat & Kustenforsch GmbH, Helmholtz Zentrum Geesthacht, D-21502 Geesthacht, Germany

关键词: Acoustic emission;    Magnesium;    Single crystals;    Dislocations;    Twinning;   

DOI  :  10.1016/j.msea.2015.10.033

来源: Elsevier

【 摘 要 】

Magnesium single crystals with various crystallographic orientations were uniaxially and channel-die compressed at room temperature (RT) and at a constant strain rate of 10(-3) s(-1) in order to obtain a comprehensive set of acoustic emission (AE) data, which can be applied in studies of twinning and dislocation processes in polycrystalline Mg alloys. Loading along the < 11.2 > axis led to a preferable activation of basal slip and it was accompanied by a low amplitude AE signal. Twinning was observed exclusively during compression along the < 10.0 > and < 11.0 > axis. The twin nucleation was associated with burst AE signals with high amplitudes. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free