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. 20    No. 3    March 2010

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Differences of grain-refining effect of Sc and Ti additions in aluminum by empirical electron theory analysis
YE Yi-cong(叶益聪)1, HE Liang-ju(何良菊)2, LI Pei-jie(李培杰)1

1. National Center of Novel Materials for International Research, Department of Mechanical Engineering,
Tsinghua University, Beijing 100084, China;
2. School of Aerospace, Tsinghua University, Beijing 100084, China

Abstract:The differences of grain-refining effect between Sc and Ti additions in aluminum, which cannot be substantially explained by traditional theories, were carefully studied. The empirical electron theory (EET) of solids and molecules was employed to calculate the valence electron structures (VES) of Al3Ti and Al3Sc. The conclusions can be drawn that, in the two alloys Al-Ti and Al-Sc, the different valence electron structures of Al3Ti and Al3Sc and the consequent differences of growth habit of the two particles, and the different interfacial electron density between particles and matrix fundamentally lead to the differences of grain-refining effect between Sc and Ti additions on aluminum and make Sr the better grain-refiner of aluminum.

 

Key words: grain refining; empirical electron theory (EET); valence electron structure (VES); Al3Sc; Al3Ti

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

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

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