The role of microstructure and texture in controlling mechanical properties of AZ31B magnesium alloy processed by I-ECAP

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

卷:638

Article

Gzyl, Michal¹  Rosochowski, Andrzej²  Boczkal, Sonia³  Olejnik, Lech⁴ 

[1] Univ Strathclyde, Adv Forming Res Ctr, Paisley PA4 9LJ, Renfrew, Scotland

[2] Univ Strathclyde, Design Mfg & Engn Management, Glasgow G1 1XJ, Lanark, Scotland

[3] Inst Nonferrous Met Gliwice, Light Met Div, PL-32050 Skawina, Poland

[4] Warsaw Univ Technol, Inst Mfg Proc, PL-02524 Warsaw, Poland

关键词: Magnesium alloys;    Equal channel angular pressing (ECAP);    Severe plastic deformation (SPD);    Ultra-fine grained (UFG) material;    Electron backscatter diffraction (EBSD);   

DOI  :  10.1016/j.msea.2015.04.055

来源: Elsevier

【 摘 要 】

Mechanical properties of AZ31B magnesium alloy were modified in this work by various processing routes of incremental equal channel angular pressing (I-ECAP) followed by heat treatment. Possible strategies for improving ductility and strength of the alloy were investigated. Processing by routes A and B-C showed that texture plays predominant role in controlling mechanical properties at room temperature. Four passes of I-ECAP by route C followed by annealing enhanced ductility up to 035 of true strain. It was found that tensile twinning was important in accommodating strain during tensile testing, which resulted in a very good hardening behaviour. The yield strength was improved to 300 MPa by refining grain size to 0.8 mu m in I-ECAP at 150 degrees C. The obtained structure and properties were shown to be stable up to 150 degrees C. True strain at fracture was increased to 0.2 after annealing at 150 degrees C without lowering strength. (C) 2015 The Authors. Published by Elsevier B.V.

【 授权许可】

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