Enhanced tensile properties of Al matrix composites reinforced with β-Si3N4 whiskers

被引：30
作者：
Zhang, Chenxu [1 ,2 ]
Yin, Jinwei [1 ]
Yao, Dongxu [1 ]
Zuo, Kaihui [1 ]
Xia, Yongfeng [1 ]
Liang, Hanqin [1 ]
Zeng, Yuping [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：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2017年 / 102卷
基金：
中国国家自然科学基金;
关键词：
Metal-matrix composites (MMCs); Interface/interphase; Mechanical properties; Microstructural analysis; SILICON NITRIDE WHISKERS; MECHANICAL-PROPERTIES; STRENGTHENING MECHANISMS; THERMAL-CONDUCTIVITY; ALUMINUM COMPOSITES; FRACTURE-TOUGHNESS; BEHAVIOR; MICROSTRUCTURE; TEMPERATURE; FABRICATION;
D O I：
10.1016/j.compositesa.2017.07.025
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Al matrix composites reinforced with beta-Si3N4 whiskers (beta-Si(3)N(4)w) were fabricated by hot pressing method. The microstructures showed that the whiskers were uniformly dispersed in the matrix and the Al/beta-Si3N4 interface was well bonded without interface reaction. Effects of beta-Si(3)N(4)w content and sintering parameters on the densification and tensile behavior of composites were investigated. The results indicated that beta-Si(3)N(4)w could both enhance the ultimate tensile strength (UTS) and maintain the ductility of Al matrix when the whisker content was 5 vol%, corresponding to an elongation at break and an UTS of 21.2% and 239 MPa, respectively. However, higher whisker content could improve UTS of composites to the maximum value of 312 MPa, which was 158 MPa higher than pure Al, while reducing elongation of composites. The fracture mechanism changed from ductile fracture to a combination of both ductile and brittle fracture mechanism with the increase of whisker content. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：145 / 153
页数：9
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