Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 3    March 2016

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Dry sliding wear behavior of rheocast hypereutecticAl-Si alloys with different Fe contents
Chong LIN1,2, Shu-sen WU1, Shu-lin Lü1, Jin-biao ZENG1,Ping AN1

1. State Key Laboratory of Materials Processing and Die & Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China;
2. School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, China

Abstract:The effect of iron content on wear behavior of hypereutectic Al-17Si-2Cu-1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The results show that the wear rate of the rheocast alloy is lower than that of the alloy produced by conventional casting process under the same applied load. The fine particle-like δ-Al4(Fe,Mn)Si2 and polygonal α-Al15(Fe,Mn)3Si2 phases help to improve the wear resistance of rheocast alloys. As the volume fraction of fine Fe-bearing compounds increases, the wear rate of the rheocast alloy decreases. Moreover, the wear rate of rheocast alloy increases with the increase of applied load from 50 to 200 N. For the rheocast alloy with 3% Fe, oxidationwear is the main mechanism at low applied load (50 N). At higher applied loads, a combination of delamination and oxidation wear is the dominant wear mechanism.

 

Key words: dry sliding wear; hypereutectic Al-Si alloy; rheocasting; Fe-bearing compound; wear mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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