Effect of high-pressure torsion on grain refinement, strength enhancement and uniform ductility of EZ magnesium alloy

被引：71

作者：

Bryla, Krzysztof ^{[1
]}

Morgiel, Jerzy ^{[2
]}

Faryna, Marek ^{[2
]}

Edalati, Kaveh ^{[3
,4
]}

Horita, Zenji ^{[3
,4
]}

机构：

[1] Pedag Univ Cracow, Fac Math Phys & Tech Sci, Inst Technol, Krakow, Poland

[2] Polish Acad Sci, Inst Met & Mat Sci, Krakow, Poland

[3] Kyushu Univ, Dept Mat Sci & Engn, Fukuoka, Japan

[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka, Japan

来源：

MATERIALS LETTERS | 2018年 / 212卷

关键词：

Magnesium alloys; Grain refinement; High-pressure torsion; Ultrafine-grained materials; MICROSTRUCTURE DEVELOPMENT;

D O I：

10.1016/j.matlet.2017.10.113

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Strength enhancement of Mg-based alloys without deteriorating their ductility is currently a major scientific and industrial challenge. In this study, discs of as-cast EZ33A alloy were processed by high-pressure torsion (HPT). The coarse-grained cast material was turned to ultrafine-grained (UFG) of similar to 240 nm, similar to 135 nm and similar to 127 nm size, after 1, 3 and 10 turns, respectively. Simultaneously, hardness increased from 60 HV for the as-cast material to 90-95 HV after HPT processing. Samples subjected to various HPT routes showed enhanced ultimate tensile strength of 270 MPa, along with their uniform elongation up to 10%. The simultaneous increase of strength and ductility was attributed to the bimodal grain size distribution, as well as to the fragmentation and redistribution of brittle (Mg,Zn)(12)Ce phase. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：323 / 326

页数：4

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