Dry sliding wear behavior of rheocast hypereutectic Al-Si alloys with different Fe contents

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• 作者：Chong LIN^a ; ^b ; Shu-sen WU^a ; Shu-lin L&Uuml ; ^a ; ^{shulin317@hust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jin-biao ZENG^a ; Ping AN^a
• 关键词：dry sliding wear ; hypereutectic Al&ndash ; Si alloy ; rheocasting ; Fe-bearing compound ; wear mechanism
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：26
• 期：3
• 页码：665-675
• 全文大小：5684 K

文摘

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, oxidation wear 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.