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

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Transactions of Nonferrous Metals Society of China

Vol. 26    No. 11    November 2016

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Dry wear behavior of rheo-casting Al-16Si-4Cu-0.5Mg alloy
Zhao-hua HU1, Guo-hua WU1, Jia XU1, Wen-fei MO1, Yan-lei LI1, Wen-cai LIU, Liang ZHANG1, Wen-jiang DING1, Jonathan QUAN2, Yuan-Wei CHANG2

1. National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of
Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Department of Materials Science and Engineering,
University of California Los Angeles, Los Angeles, CA 90095, USA

Abstract:Dry wear behavior of the rheo-casting Al-16Si-4Cu-0.5Mg alloy was investigated by micro-scratch and dry sliding wear tests. Analyses of the microstructure, scratch grooves, wear tracks, worn surfaces and wear debris of the alloy were carried out by optical microscope and scanning electron microscope. The microstructural analysis showed that via rheo-processing, the primary Si was refined and rounded, eutectics dispersed more homogenously, and even the skeleton AlFeMnSi phase was fragmented into facet shape. Micro-scratch test showed that the microstructural refinement resulted in better wear resistance. Dry sliding wear test revealed that the rheo-processed sample exhibit obviously superior wear resistance because of the microstructure improvement. The dominant mechanism in mild wear condition is abrasion, but it turned to adhesion and oxidation in high applied load and fast sliding velocity conditions.


Key words: rheo-casting; aluminum alloy; dry wear; micro-scratch

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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