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Analysis of effects of reactant particle size on phase transformations in the Ti–Si–Cu system using differential thermal analysis and x-ray diffraction

Published online by Cambridge University Press:  03 July 2012

Si-Jie Lü ,
Hui-Yuan Wang ,
Zhi-Zheng Yang  and
Qi-Chuan Jiang
Si-Jie Lü
Affiliation:
Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun 130025, People’s Republic of China
Hui-Yuan Wang*
Affiliation:
Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun 130025, People’s Republic of China
Zhi-Zheng Yang
Affiliation:
Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun 130025, People’s Republic of China
Qi-Chuan Jiang*
Affiliation:
Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun 130025, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Effects of Ti and Si particle sizes on phase transformations of Ti–Si–Cu system were explored through differential thermal analysis (DTA), x-ray diffraction (XRD), and field emission scanning electron microscope (FESEM). For Ti[15]Si[15]Cu[45] system, fine Ti easily dissolves into Si–Cu liquid to form Ti–Si–Cu liquid at ∼795 °C, which further participates into the reaction of β-Ti and Si to yield abundant quantity of Ti5Si3 at ∼917 °C. For Ti[150]Si[15]Cu[45] system, nonetheless, the reaction of coarse Ti with Si–Cu liquid involves more difficulty in forming the ternary liquid , which is the causal factor for the delay in the formation of Ti5Si3 to ∼948 °C. For Ti[15]Si[150]Cu[45] system, coarse Si results in the formation of insufficient Si–Cu liquid initially, whereas Ti–Cu liquid forms at ∼960 °C instead, which further reacts with coarse Si to form Ti–Si–Cu liquid, and then Ti5Si3is precipitated from the liquid.

Keywords

Differential thermal analysis (DTA)Phase transformationsX–ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 20 , 28 October 2012 , pp. 2615 - 2623
Copyright
Copyright © Materials Research Society 2012

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