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田 野,李 萍,马俊林,薛克敏,林 泉.高压扭转对难熔金属粉末组织致密及强化研究[J].稀有金属材料与工程(英文),2017,46(10):2987~2992.[Tian Ye,Li Ping,Ma Junlin,Xue Kemin,Lin Quan.Research of high-pressure torsion on dense compact and strengthening of refractory powder[J].Rare Metal Materials and Engineering,2017,46(10):2987~2992.]
Research of high-pressure torsion on dense compact and strengthening of refractory powder
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Received:June 25, 2015  Revised:August 24, 2015
Key words: Mo powder  high-pressure torsion  dense compact  micro strain  grain strengthening  dislocation density
Foundation item:教育部新世纪优秀人才支持计划(2013JYXR0657)
Author NameAffiliationE-mail
Tian Ye Hefei University of Technology clcx2009ty@163.com 
Li Ping Hefei University of Technology li-ping@hfut.edu.cn 
Ma Junlin Hefei University of Technology  
Xue Kemin Hefei University of Technology  
Lin Quan Hefei University of Technology  
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      Pure molybdenum powder was successfully directly compacted into the dense body material by high-pressure torsion at 350℃. The effects of HPT on pore closure and performance strengthening of the powder particle were investigated by optical telescope, microhardness-testing device, scanning electronic telescope and X-ray diffractometer. The results indicate that the molybdenum powder mechanical mesh each other by particles movement and deformation under shear force, at this time the interface bonding performance, the large chain pores in particles were welded effectively after high-pressure torsion. In the HPT process the crystal size decrease from 59.8nm to 46.9nm, the micro strain increases from 1.04′10-4to 1.12′10-3. The lattice defects caused by grain refinement and micro strain can promote dislocation multiplication and tangling to strengthen the matrixmethod.