Micromechanisms and mechanics of ultra-mild wear in Al-Si alloys

被引：78

作者：

Chen, M. ^{[1
]}

Meng-Burany, X. ^{[1
]}

Perry, T. A. ^{[2
]}

Alpas, A. T. ^{[1
]}

机构：

[1] Univ Windsor, Dept Mech Automot & Mat Engn, NSERC Gen Motors Canada Res Chair, Windsor, ON N9B 3P4, Canada

[2] Gen Motors Res & Dev Ctr, Warren, MI 48090 USA

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 19期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Al-Si alloys; Ultra-mild wear; Wear mechanisms; Microstructure; Surface damage;

D O I：

10.1016/j.actamat.2008.07.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The micromechanisms that control the sliding wear behavior of AI-Si alloys tested under ultra-mild wear conditions were characterized using optical profilometry and electron microscopy, and analyzed by means of a contact mechanics model. A series of damage events occurred to the chemically etched surfaces of an Al-25%, Si alloy, subjected to boundary-lubricated contact during pin-on-disk tests. in the following sequence: the fracture and/or sinking-in of silicon particles into the aluminum matrix accompanied by the formation of aluminum pile-ups; aluminum wear (rapid wear period) and the development of an oil residue layer on the contact surface. Compared to an Al-11% Si with similar silicon morphology but lower hardness, the Al-25%. Si delayed aluminum wear more effectively. Once an oil residue layer supported by a subsurface microstructure consisting of ultra-fine aluminum grains was formed, both alloys displayed decreasing wear rates. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5605 / 5616

页数：12

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