Ultrafine Grain Tungsten Heavy Alloys with Excellent Performance Prepared by Spark Plasma Sintering  

作　　者：ZHANG Jingang WANG Weimin JI Wei HE Qianglong WANG Aiyang TAN Lin YANG Kai 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Institute of Material Science and Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第2期393-398,共6页武汉理工大学学报（材料科学英文版）

基　　金：the National Key Research and Development Plan of China(2017YFB0310400);the National Natural Science Foundation of China(Nos.5167020705 and 51902233);the Self-determined and Innovative Research Funds of WHUT(2019III059XZ)。

摘　　要：Ultrafine grain tungsten heavy alloys (WHAs) were successfully produced from the nano-crystalline powders using spark plasma sintering.The present study mainly discussed the effects of sintering temperature on the density,microstructure and mechanical properties of the alloys.The relative density of 98.12% was obtained at 1 050 ℃,and the tungsten grain size is about 871 nm.At 1 000 ℃-1 200 ℃,the mechanical properties of the alloys tend to first rise and then goes down.After SPS,the alloy exhibits improved hardness (84.3 HRA at 1 050 ℃) and bending strength (987.16 MPa at 1 100 ℃),due to the ultrafine-grained microstructure.The fracture mode after bending tests is mainly characterized as intergranular or intragranular fracture of W grains,interfacial debonding of W grains-binding phase and ductile tearing of binding phase.The EDS analysis reveals a certain proportion of solid solution between W and Ni-Fe binding phase.The good mechanical properties of the alloys can be attributed to grain refinement and solid solution strengthening.

关 键 词：tungsten heavy alloys ultrafine grain nano-crystalline powders solid solution strengthening spark plasma sintering 

分 类 号：TF125.241[冶金工程—粉末冶金]