Effects of addition of magnesium on interface structure and high-strain-rate superplasticity in Si3N4-reinforced Al-alloy composites

被引：42

作者：

Jeong, HG ^{[1
]}

Hiraga, K

Mabuchi, M

Higashi, K

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Natl Ind Res Inst Nagoya, Kita Ku, Nagoya, Aichi 4620057, Japan

[3] Univ Osaka Prefecture, Coll Engn, Dept Met & Mat Sci, Osaka 5998231, Japan

来源：

ACTA MATERIALIA | 1998年 / 46卷 / 17期

关键词：

D O I：

10.1016/S1359-6454(98)00282-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanical properties and interface structure of fine-grained Al-Cu alloy and Al-Cu-Mg alloy composites, reinforced with Si3N4 whiskers (Si(3)N(4)w) and particles (Si(3)N(4)p), are investigated to reveal the role of magnesium addition in high-strain-rate superplasticity. The AI-Cu alloy composites, which exhibit lower elongations (<100%), have clear interfaces between the Al-matrix and Si3N4 crystals without any interfacial reaction. On the other hand, the interfaces in the Al-Cu-Mg alloy composites, which exhibit high elongations (>280%), show strong reaction between the Al-matrix and Si3N4 crystals. The result suggests that the addition of magnesium causes the reaction between the Al-matrix and Si3N4 crystals, and consequently that partially melting of the reaction phases at the tensile-testing temperature results in the relaxation of stress concentration and suppresses the development of microcracks and cavities at the interfaces during superplastic deformation. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science! Ltd: All rights reserved.

引用

页码：6009 / 6020

页数：12

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