Spherical shape of γ-Mg17Al12 precipitates in AZ91 magnesium alloy processed by equal-channel angular pressing

被引：60
作者：
Braszczynska-Malik, K. N. [1 ]
机构：
[1] Czestochowa Tech Univ, Inst Mat Engn, PL-42200 Czestochowa, Poland
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 487卷 / 1-2期
关键词：
Magnesium alloy; Precipitation; Microstructure; Equal-channel angular pressing; NONBASAL SLIP SYSTEMS; GRAIN-REFINEMENT; MG ALLOY; MECHANICAL-PROPERTIES; HCP METALS; MICROSTRUCTURE; AL; DEFORMATION; TEMPERATURE; PRINCIPLES;
D O I：
10.1016/j.jallcom.2009.07.100
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructure investigations of the AZ91 alloy after equal-channel angular pressing (ECAP) were presented. Solution annealed billets were processed at a 0.16 mm s(-1) pressing rate and temperatures of 623 and 553 K. The average grain size was reduced from 150 mu m initially to a final value of 10 mu m. The microstructure analyses revealed gamma-Mg17Al12 precipitates with a spherical morphology located particularly inside the equiaxal grains of an alpha-solid solution. Additionally, different shapes of gamma precipitates, plate-like or rod-like (typical for heat treatment processes) were not observed. The spherical shape of gamma precipitates was obtained due to correlate magnesium matrix alloy deformation during pressing with precipitation process. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：263 / 268
页数：6
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