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. 30    No. 11    November 2020

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Effect of Sr modification on microstructure and thermal conductivity of hypoeutectic Al-Si alloys
Jun-qi GAN, Yu-jian HUANG , Cheng WEN, Jun DU

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:Trace amount of Sr (0.05 wt.%) was added into the hypoeutectic Al-Si (3-12 wt.% Si) alloys to modify their microstructure and improve thermal conductivity. The results showed that the thermal conductivity of hypoeutectic Al-Si alloys was improved by Sr modification, and the increment and increasing rate of the thermal conductivity gradually increased with Si content increasing. The improvement of thermal conductivity was primarily related to the morphology variation of eutectic Si phases. In Sr-modified Al-Si alloys, the morphology of eutectic Si phases was a mixed morphology of fiber structure and fine flaky structure, and the proportion of the fine flaky eutectic Si phases gradually decreased with Si content increasing. Under the Si content reaching 9 wt.%, the proportion of fine flaky eutectic Si phases was nearly negligible in Sr-modified alloys. Correspondingly, the increment and increasing rate of thermal conductivity of Sr-modified alloys reached the maximum and tended to be stable.

 

Key words: hypoeutectic Al-Si alloy; Sr modification; eutectic Si morphology; thermal conductivity; Al/Si interface

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

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

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