Microstructures and mechanical properties of AZ91 magnesium alloy processed by multidirectional forging under decreasing temperature conditions

被引：51

作者：

Nie, K. B. ^{[1
]}

Wang, X. J. ^{[2
]}

Deng, K. K. ^{[1
]}

Xu, F. J. ^{[1
]}

Wu, K. ^{[2
]}

Zheng, M. Y. ^{[2
]}

机构：

[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 617卷

基金：

中国国家自然科学基金;

关键词：

Multidirectional forging; AZ91; alloy; Microstructure; Mechanical properties; SEVERE PLASTIC-DEFORMATION; TENSILE PROPERTIES; GRAIN-REFINEMENT; HEAT-TREATMENT; AS-CAST; TEXTURE; EVOLUTION; STRENGTH; TWINS;

D O I：

10.1016/j.jallcom.2014.08.148

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 present study dealt with the AZ91 alloy subjected to multidirectional forging (MDF) under decreasing temperature conditions with emphasizing on relationship between microstructures and mechanical properties generated by MDF. The obtained results showed that grains of the alloy were gradually refined while the amount of the second phase precipitated along the grain boundaries was increased with increasing the MDF passes and decreasing the MDF temperature. Compared with the as-cast alloy, yield strength, ultimate tensile strength and elongation of the AZ91 alloy after MDF under decreasing temperature conditions were simultaneously increased. As the numbers of MDF passes were gradually increased and the MDF temperature was gradually decreased, the yield strength was gradually decreased, suggesting that texture softening may overwhelm the strengthening due to the grain refinement as well as the homogeneous distribution of precipitates. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：979 / 987

页数：9

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