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Microstructures and Properties of W-Ti Alloys Prepared Under Different Cooling Conditions

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Abstract

W-(10 to 15) wt.% Ti alloys were sintered at 1400 or 1500 °C and cooled under different cooling conditions. The microstructures and properties of W-Ti alloys were affected by the cooling conditions. XRD, SEM, EBSD, and TEM were carried out to investigate the effects of cooling conditions and sintering temperature on the microstructures of W-Ti alloys. The nanohardness and elastic modulus of the alloys were also investigated. The results showed that when the temperature was 1500 °C, the content of Ti-rich phase in W-(10 to 15) wt.% Ti alloys decreased obviously with the increase of cooling rate (the average cooling rate of furnace cooling, air cooling and water cooling was 0.2, 10, and 280 °C/s, respectively). For the W-10 wt.% Ti alloy, the content decreased from 20.5 to 9.7%, and the grain size decreased from 2.33 to 0.67 μm. When the temperature decreased to 1400 °C, the grain size was also decreased sharply with the increase of cooling rate, but there was a little change in the microstructure. Meanwhile, the grain sizes were smaller than those of the alloys sintered at 1500 °C. The nanohardness and elastic modulus increased with the increase of cooling rate, and the alloys sintered at different temperatures had different nanohardness and elastic modulus which depended on the cooling conditions. Sintering at a proper temperature and then cooling at a certain cooling condition was a useful method to fabricate alloy with less Ti-rich phase and high properties.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Nos. 51174161 and 51371139), the Pivot Innovation Team of Shaanxi Electric Materials and Infiltration Technique (No. 2012KCT-25), Shaanxi provincial project of special foundation of key disciplines, Natural Science Basic Research Plan in Shaanxi Province of China (No. 2015JM5179), Scientific Research Program Funded by Shaanxi Provincial Education Department of China (No. 15JS072), and 863 Program (No. 2015AA034304).

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  1. Key Laboratory for Electrical Materials and Infiltration Technology, Xi’an University of Technology, Xi’an, 710048, China

    Weili Dai, Shuhua Liang, Qing Yang, Juntao Zou & Longchao Zhuo

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  1. Weili Dai
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  2. Shuhua Liang
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Correspondence to Shuhua Liang.

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Dai, W., Liang, S., Yang, Q. et al. Microstructures and Properties of W-Ti Alloys Prepared Under Different Cooling Conditions. J. of Materi Eng and Perform 25, 2626–2634 (2016). https://doi.org/10.1007/s11665-016-2146-9

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