Microstructure and Mechanical Properties of Nano-Size Zirconium Carbide Dispersion Strengthened Tungsten Alloys Fabricated by Spark Plasma Sintering Method

XIE Zhuoming (谢卓明); LIU Rui (刘瑞); FANG Qianfeng (方前锋); ZHANG Tao (张涛); JIANG Yan (蒋燕); WANG Xianping (王先平); LIU Changsong (刘长松)

doi:10.1088/1009-0630/17/12/15

Plasma Science and Technology > 2015 > 17(12): 1066-1071. > DOI: 10.1088/1009-0630/17/12/15

XIE Zhuoming (谢卓明), LIU Rui (刘瑞), FANG Qianfeng (方前锋), ZHANG Tao (张涛), JIANG Yan (蒋燕), WANG Xianping (王先平), LIU Changsong (刘长松). Microstructure and Mechanical Properties of Nano-Size Zirconium Carbide Dispersion Strengthened Tungsten Alloys Fabricated by Spark Plasma Sintering Method[J]. Plasma Science and Technology, 2015, 17(12): 1066-1071. DOI: 10.1088/1009-0630/17/12/15

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Microstructure and Mechanical Properties of Nano-Size Zirconium Carbide Dispersion Strengthened Tungsten Alloys Fabricated by Spark Plasma Sintering Method

1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China 2University of Science and Technology of China, Hefei 230026, China

Funds: supported by the Innovation Program of Chinese Academy of Sciences (No. KJCX2-YW-N35), the National Magnetic Confinement Fusion Science Program of China (No. 2011GB108004), National Natural Science Foundation of China (Nos. 51301164, 11075177,11274305), and Anhui Provincial Natural Science Foundation of China (No. 1408085QE77)

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Received Date: November 24, 2014

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Abstract

Abstract

W-(0.2, 0.5, 1.0)wt% ZrC alloys with a relative density above 97.5% were fabricated through the spark plasma sintering (SPS) method. The grain size of W-1.0wt% ZrC is about 2.7 μm, smaller than that of pure W and W-(0.2, 0.5)wt% ZrC. The results indicated that the W-ZrC alloys exhibit higher hardness at room temperature, higher tensile strength at high tem?perature, and a lower ductile to brittle transition temperature (DBTT) than pure W. The tensile strength and total elongation of W-0.5wt% ZrC alloy at 700oC is 535 MPa and 24.8%, which are respectively 59% and 114% higher than those of pure W (337 MPa, 11.6%). The DBTT of W-(0.2, 0.5, 1.0)wt% ZrC materials is in the range of 500 oC-600oC, which is about 100oC lower than that of pure W. Based on microstructure analysis, the improved mechanical properties of the W-ZrC alloys were suggested to originate from the enhanced grain boundary cohesion by ZrC capturing the impurity oxygen in tungsten and nano-size ZrC dispersion strengthening.
- tungsten,
- zirconium carbide,
- mechanical property,
- dispersion strengthening

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