The improved mechanical properties of Al matrix composites reinforced with oriented β-Si3N4 whisker

被引：33

作者：

Zhang, Chenxu ^{[1
,2
]}

Zeng, Yu-Ping ^{[1
]}

Yao, Dongxu ^{[1
]}

Yin, Jinwei ^{[1
]}

Zuo, Kaihui ^{[1
]}

Xia, Yongfeng ^{[1
]}

Liang, Hanqin ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2019年 / 35卷 / 07期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Metal-matrix composites (MMC); beta-Si3N4; whiskers; Preferred orientation; Interface; Mechanical properties; Extrusion; STRENGTHENING MECHANISMS; ALUMINUM-MATRIX; SILICON-NITRIDE; TENSILE PROPERTIES; BEHAVIOR; EXTRUSION; MICROSTRUCTURE; FABRICATION; INTERFACES; EVOLUTION;

D O I：

10.1016/j.jmst.2019.02.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The beta-Si3N4 whiskers (beta-Si(3)N(4)w) reinforced Al matrix composites were first fabricated by hot pressing, then treated through hot extrusion. The microstructure characterization demonstrated the preferred orientations of both beta-Si(3)N(4)w and Al grains in the as-extruded composites. It indicated that beta-Si(3)N(4)w were aligned along the extrusion direction and Al grains exhibited a distinct <111>(Al) texture. The interface between beta-Si(3)N(4)w and Al was in a good bonding status without voids and reaction products. Effects of extrusion process on the mechanical properties of composites were also investigated. The results indicated the extrusion process had a prominent strengthening effect on the mechanical properties of composites. The maximum yield strength and ultimate tensile strength of composites reached up to 170 and 289 MPa, respectively, accompanied by a 12.3% elongation at fracture when the whisker fraction was 15 vol.%. This improvement was collectively attributed to the densification of composites, the strong interface, and the preferred orientation inside composites. The yield strength of the composites reinforced with 5 vol.% beta-Si(3)N(4)w corresponded well with the theoretical value from different strengthening mechanisms. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：1345 / 1353

页数：9

共 47 条

[1] Densification, hardness and tribological characteristics of MWCNTs reinforced Ti6Al4V compacts consolidated by spark plasma sintering [J].