Effect of hot extrusion on wear properties of Al-15 wt.% Mg2Si in situ metal matrix composites

被引：118

作者：

Soltani, N. ^{[1
,4
]}

Nodooshan, H. R. Jafari ^{[2
]}

Bahrami, A. ^{[3
,4
]}

Pech-Canul, M. I. ^{[4
]}

Liu, Wencai ^{[2
]}

Wu, Gouhua ^{[2
]}

机构：

[1] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran, Iran

[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China

[3] Razi Met Res Ctr, Tehran, Iran

[4] IPN Unidad Saltillo, Ctr Invest & Estudios Avanzados, Ramos Arizpe 25900, Coahuila, Mexico

来源：

MATERIALS & DESIGN | 2014年 / 53卷

关键词：

Aluminum composites; Hot extrusion; Hardness measurements; Wear; TENSILE PROPERTIES; MICROSTRUCTURE; TEMPERATURE; BEHAVIOR;

D O I：

10.1016/j.matdes.2013.07.084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Al-15 wt.% Mg2Si composites were prepared by in situ casting and characterized in wear tests. Previous to the extrusion of specimens at 470 degrees C - varying extrusion ratio (7.4, 14.1 and 25), the as-cast composites were homogenized at 500 degrees C for 5 h, followed by slow furnace cooling. The microstructure, hardness and sliding wear behavior were characterized for both, the as-cast and hot extruded composites. Results show that increasing the extrusion ratio causes a significant improvement in hardness and wear resistance. This is ascribed to the observed decrease in average size and better distribution of Mg2Si particles, in tandem with a remarkable decrease in porosity percentages, which goes from 5.63 in the as-cast condition, to 0.47 at the extrusion ratio of 25. It was found that abrasion is the dominant wear mechanism in all extruded composites, whilst a combination of adhesion and delamination appears to be the governing mechanism for as-cast composites. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：774 / 781

页数：8

共 21 条

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