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

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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Acknowledgments

This work was supported by the National Science Fund of China for Distinguished Young Scholars (No. 50325516), the National High Technology Research and Development Program of China (No. 2007AA03Z112), the MOST (No. 2007CB616905), the Guangdong Natural Science Foundation (No. 07300579), the China Postdoctoral Science Foundation (No. 20060390198), and the Postdoctoral Innovation Foundation of South China University of Technology (No. 05243). The authors are very grateful to Senior Engineer X.F. Ruan from Wuhan University for his technical assistances in the SPS experiments.

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Correspondence to C. Yang.

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Li, Y., Yang, C., Chen, W. et al. Effect of WC content on glass formation, thermal stability, and phase evolution of a TiNbCuNiAl alloy synthesized by mechanical alloying. Journal of Materials Research 23, 745–754 (2008). https://doi.org/10.1557/JMR.2008.0087

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