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

Vol. 26    No. 12    December 2016

Formation and characterization of self-lubricated carbide layer on AA6082 Al-Mg-Si aluminum alloy by electrical discharge alloying process
Wang-Chih Chen1, Hung-Mao Lin2, Jun-Yen Uan1
(1. Department of Materials Science and Engineering, National Chung Hsing University, 145 Xingda Rd., South Dist., Taichung City 40227, China;
2. Department of Mechanical Engineering, Far East University, Zhonghua Rd., Xinshi Dist., Tainan City 74448, China
Abstract: The surface modification on the AA6082 Al-Mg-Si aging-hardenable aluminum alloy was investigated by electrical discharge alloying (EDA) process. Kerosene, used as a dielectric fluid, was pyrolytically decomposed into carbon for the formation of a self-lubricated carbide layer on the aluminum alloy surface during EDA process. Transmission electron microscopy (TEM) image found that the self-lubricated carbide layer was a multi-phase material with carbides and graphite. As a result, the EDA-modified aluminum alloy had a negligible wear rate of ~2′10-4 mg/m (c. f. ~1.1′10-2 mg/m for aluminum alloy substrate). Notably, a new characteristic was found that the EDA-processed carbide layer was a soft magnet, which improved the electromagnetic interference (EMI) shielding performance of the alloy.
Key words: Al-Mg-Si aluminum alloy; surface modification; electrical discharge alloying; self-lubricating; pyrolytic carbon; electromagnetic interference shielding
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)