Direct observation of precipitation along twin boundaries and dissolution in a magnesium alloy annealing at high temperature

SCRIPTA MATERIALIA

卷:138

Article

Guan, Dikai¹  Nutter, John¹  Sharp, Joanne¹  Gao, Junheng¹  Rainforth, W. Mark¹ 

[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

关键词: Magnesium alloy;    Twinning;    Annealing;    Precipitation;    Recrystallization;   

DOI  :  10.1016/j.scriptamat.2017.05.015

来源: Elsevier

【 摘 要 】

Precipitation along twin boundaries and dissolution in a cold-rolled Mg-Y-Nd alloy was directly observed for the first time during annealing at 490 degrees C Precipitation occurred concurrently with recrystallization and the combined effect of precipitation and solute segregated to twin boundaries modified the recrystallization behaviour. Precipitates later dissolved into the matrix at the point where full recrystallization was nearly complete. The precipitates and higher solute concentration along original twin boundaries hindered grain growth of newly formed recrystallized grains. Even where twin boundaries had been consumed by recrystallization, the size of recrystallized grains were still controlled by the pre-existing twin boundaries. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

Free