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

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 about2.7 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 te...

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Published inPlasma science & technology Vol. 17; no. 12; pp. 1066 - 1071
Main Author 谢卓明 刘瑞 方前锋 张涛 蒋燕 王先平 刘长松
Format Journal Article
LanguageEnglish
Published 01.12.2015
Subjects
Alloys
Ductile brittle transition
Mechanical properties
Microstructure
Nanostructure
Spark plasma sintering
Tensile strength
Tungsten
制备
力学性能
弥散强化
放电等离子烧结
烧结法
碳化锆
纳米
钨合金
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ISSN1009-0630
DOI10.1088/1009-0630/17/12/15

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Summary: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 about2.7 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 temperature,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 700 ℃ 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 ℃-600 ℃,which is about 100 ℃ 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.
Bibliography:tungsten Dispersion Sintering spark SAED tensile sintering crystalline dispersed cubic
XIE Zhuoming, LIU Rui, FANG Qianfeng, ZHANG Tao , JIANG Yan,WANG Xianping , LIU Changsong （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）
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 about2.7 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 temperature,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 700 ℃ 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 ℃-600 ℃,which is about 100 ℃ 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.
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ISSN:1009-0630
DOI:10.1088/1009-0630/17/12/15