Compressive deformation behavior of dendritic Mg-Ca(-Zn) alloys at high temperature

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

卷:763

Article

Papillon, Justine¹  Salero, Paul¹  Mercier, Florian¹  Fabregue, Damien¹  Maire, Eric¹ 

[1] Univ Lyon, INSA Lyon, MATEIS, UMR CNRS 5510, F-69621 Villeurbanne, France

关键词: Magnesium alloys;    Multiphase;    Hot compression;    Dynamic recrystallization;   

DOI  :  10.1016/j.msea.2019.138180

来源: Elsevier

【 摘 要 】

Mg-Ca(-Zn) alloys were subjected to hot compression at temperatures ranging from 350 degrees C to 450 degrees C and strain rates of 10(-3) to 10 s(-1). In the corresponding flow curves, the peak stress appeared at very low strain rates (less than 0.05) followed by steady state at a constant stress, indicating the occurrence of dynamic flow softening, which is a typical signature of dynamic recrystallization (DRX). The DRX was greatly affected by the deformation conditions and Ca/Zn contents, and optical and scanning electron microscopy analysis revealed that the DRX induced rearrangement of the complex dendritic microstructure during compression. Optimal parameters for the deformation were identified. These indicate deformation conditions where the processing is safe and easy. This in turn is likely to enable widening of the range of applications of Mg-Ca(-Zn) alloys.

【 授权许可】

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