Effects of heat-treatment on the interfacial reaction and tensile properties of Al2O3 coated-Al18B4O33w/Al-Mg matrix composites

被引：14
作者：
Yu, Yucheng [1 ,2 ]
Tang, Shawei [1 ]
Hu, Jin [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Heilongjiang Univ Sci & Technol, Coll Mat Sci & Engn, Harbin, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 90卷
关键词：
Heat treatment; Coatings; Aluminum matrix composite; Interfaces; Mechanical property; ALUMINA BORATE WHISKER; AL18B4O33; WHISKER; MECHANICAL-PROPERTIES; MICROSTRUCTURE; FABRICATION; MG; STRENGTH; BEHAVIOR;
D O I：
10.1016/j.matdes.2015.11.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Al-Mg matrix composites reinforced by Al18B4O33 whiskers with and without Al2O3 coating were fabricated by squeeze casting. The effects of heat treatment on the microstructures and tensile properties of the composites were investigated. The results indicated that the heat treatment strongly affects the interphase, the precipitation phases, and the dislocation states in the matrices of the composites. This leads to great changes in the tensile properties of the composites during the heat-treatment process. The heat treatment does not affect the interface reaction of the composite with raw whiskers, but affects that of the composite-contained coated whiskers. After heat treatment for 20 h, a new interface phase of MgAl2O4 forms in the composite-contained coated whiskers, which is responsible for the lowtensile properties. In addition, the dislocation states and the precipitation phases affect the tensile properties of the composites distinctly. A suitable heat-treatment process can be found for the ultimate tensile strength and elongation to fracture. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：416 / 423
页数：8
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