Structure of GP zones in Al-Si matrix composites solidified under high pressure

被引：14
|
作者：
Ma, P. [1 ,2 ]
Zou, C. M. [1 ]
Wang, H. W. [1 ]
Scudino, S. [2 ]
Song, K. K. [2 ]
Khoshkhoo, M. Samadi [2 ]
Wei, Z. J. [1 ]
Kuehn, U. [2 ]
Eckert, J. [2 ,3 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] IFW Dresden, Inst Complex Mat, D-01171 Dresden, Germany
[3] Tech Univ Dresden, Inst Mat Sci, D-01062 Dresden, Germany
来源：
MATERIALS LETTERS | 2013年 / 109卷
基金：
中国国家自然科学基金;
关键词：
Metallic composite; Solidification; Microstructure; HRTEM; GP zones; MG ALLOY; MICROSTRUCTURE EVOLUTION; PRECIPITATION; SILICON; SYSTEM;
D O I：
10.1016/j.matlet.2013.06.075
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structure of the Guinier-Preston (GP) zones precipitated in the Al-Si matrix composites after natural aging is investigated. The results show that, after natural aging, spherical GP zones with a diamond crystal structure form in the supersaturated alpha-Al matrix produced by high pressure solidification. The lattice parameter of the GP zones is 1.62 nm and their structure consists of Si-3 atomic clusters. The GP zones disappear and Si crystals are formed in the a-Al matrix after heating to 673 K. The precipitation sequences in the supersaturated alpha-Al matrix can be summarized as: alpha-Al (SSSS)-> GP zones -> equilibrium Si phase. (C) 2013 Elsevier B.V. All rights reserved.
引用
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页码：1 / 4
页数：4
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