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Effect of WC content on glass formation, thermal stability, and phase evolution of a TiNbCuNiAl alloy synthesized by mechanical alloying

Published online by Cambridge University Press:  31 January 2011

Y.Y. Li
Affiliation:
School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
C. Yang*
Affiliation:
School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China; and State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, People’s Republic of China
W.P. Chen
Affiliation:
School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
X.Q. Li
Affiliation:
School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Amorphous Ti66Nb13Cu8Ni6.8Al6.2 alloy powders with different tungsten carbide (WC) contents were synthesized by mechanical alloying. Outstanding differences in particle size, thermal stability, glass-forming ability, and phase evolution are found for the synthesized Ti-based glassy powders with different WC contents. This is attributed to the fact that the WC was partially alloyed into the glassy matrix and the matrix element Ti was also partially alloyed into the WC particles. The obtained glassy powders exhibit a wide supercooled liquid region above 64 K. Meanwhile, the main crystalline phase is the ductile β-Ti with a high volume fraction in the crystallized alloy powders. These two aspects offer the possibility of easily preparing a plasticity-enhanced bulk composite in the supercooled liquid region by powder metallurgy, which couples the nanosized WC particles with in situ precipitated ductile β-Ti phase.

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Articles
Copyright
Copyright © Materials Research Society 2008

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