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. 24    No. 7    July 2014

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Effect of cooling rate on morphology ofprimary particles in Al-Sc-Zr master alloy
Cong XU1, Rou DU1, Xue-jiao WANG1, Shuji HANADA 2, Hiroshi YAMAGATA3, Wen-hong WANG4, Chao-li MA1

1. Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education,
School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
2. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;
3. Center for Advanced Die Engineering and Technology, Gifu University,
1-1 Yanagido, Gifu City, Gifu 501-1193, Japan;
4. Hebei Sitong New Metal Material Co., Ltd., Baoding 071105, China

Abstract:Al-1.0%Sc-1.0%Zr (mass fraction) master alloy was prepared at different cooling rates. The morphology and thermodynamics data of the primary particles of the master alloy were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). It shows that the primary particles are dendrite-shaped particles comprised of several attached small cubic, cusped-cubic or crucifershape particles at slow cooling rate. However, the primary particles are separated with crucifer shape at intermediate cooling rate, and they are cubic with cusped-cubic shape at high cooling rate. Meanwhile, the separated and attached particles present Al3Sc/Al3Zr1-xScx core-shell structure. The formation mechanism of the structure was systematically investigated by a mathematical model.

 

Key words: Al-Sc-Zr master alloy; morphology; core-shell structure; cooling rate; formation mechanism

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

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

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