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

作　　者：谢卓明 刘瑞 方前锋 张涛 蒋燕 王先平 刘长松 

机构地区：[1]Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences [2]University of Science and Technology of China

出　　处：《Plasma Science and Technology》2015年第12期1066-1071,共6页等离子体科学和技术（英文版）

基　　金：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);Anhui Provincial Natural Science Foundation of China(No.1408085QE77)

摘　　要：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.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.

关 键 词：tungsten Dispersion Sintering spark SAED tensile sintering crystalline dispersed cubic 

分 类 号：TB33[一般工业技术—材料科学与工程] O539[理学—等离子体物理]