Aging behavior of 6061Al matrix composite reinforced with high content SiC nanowires

被引：59
|
作者：
Dong, Ronghua [1 ]
Yang, Wenshu [1 ]
Yu, Zhenhe [1 ]
Wu, Ping [2 ]
Hussain, Murid [3 ]
Jiang, Longtao [1 ]
Wu, Gaohui [1 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Northwest Inst Nucl Technol, Xian 710024, Peoples R China
[3] COMSATS Inst Informat Technol, Dept Chem Engn, Lahore 54000, Pakistan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 649卷
基金：
中国国家自然科学基金;
关键词：
Metal matrix composites; Transmission electron microscopy; TEM; Phase transitions; Al-Mg-Si alloys; PRECIPITATION SEQUENCE; ALLOY; MICROSTRUCTURE; KINETICS; PHASE;
D O I：
10.1016/j.jallcom.2015.07.233
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The aging behavior of Al matrix composites reinforced with high content nano-reinforcements has been rarely reported. In the present work, the aging behavior of 15 vol.% SiCnw/6061Al composite prepared by pressure infiltration method has been investigated. GP zones, beta" (Mg5Si6) and B' (MgSi>1) were observed as the main precipitates in under-aged, peak-aged and over-aged SiCnw/6061Al composite, respectively. After addition of high content SiC nanowires, the precipitation sequence of 6061Al has changed from "GP zones -> beta" (Mg5Si6) -> beta' (Mg1.8Si) -> beta (Mg2Si)" to " GP zones -> beta" (Mg5Si6) -> B' (MgSi>1)". Due to their higher surface energy and larger surface areas of SiC nanowires, the segregation of Mg element is very serious, leading to insufficient Mg amount to form high Mg precipitates. Moreover, the hardness of SiCnw/6061Al composite was decreased much faster than that of 6061Al alloy in the over-aging period, which might be due to the inferior strengthening effect and/or low dispersivity of B' phase. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：1037 / 1042
页数：6
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