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薛克敏,王喆,刘梅,王雪,李萍.纯钼高压扭转过程中微纳尺度的力学性能演化[J].稀有金属材料与工程(英文),2019,48(6):2033~2037.[Xue Kemin,Wang Zhe,Liu Mei,Wang Xue and Li Ping.Mechanical properties of pure molybdenum during high-pressure torsion processing at micro/nano scale[J].Rare Metal Materials and Engineering,2019,48(6):2033~2037.]
Mechanical properties of pure molybdenum during high-pressure torsion processing at micro/nano scale
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Received:December 22, 2017  Revised:January 05, 2018
DOI:
Key words: high-pressure torsion, molybdenum, nanoindentation, finite element method, hardening behavior
Foundation item:国家自然科学基金资助(项目号51675154),中国博士后科学基金资助(项目号:2017M621994),中央高校基本科研业务费专项资金资助(项目号:JZ2016HGBH1054)
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Xue Kemin,Wang Zhe,Liu Mei,Wang Xue and Li Ping  
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Abstract:
      Pure molybdenum material was processed by high-pressure torsion(HPT)at room temperature under the applied pressure of 6 GPa with different revolution number of 1, 2 and 5 turns, and the ultrafine-grained molybdenum was obtained. Nanoidentation technology was applied to characterize the mechanical properties of HPT-processed samples as well as the sintered one. The load-displacement curves, hardness and elastic modulus were obtained directly. The stress-strain curves of different samples were obtained base on the finite element simulation by using the software of Abaqus. The results show that the hardness of HPT-processed samples has an obvious increase from 3.02 GPa to 7.80 GPa. Correspondingly, the yield strength increase significantly from 970 MPa to 3370 MPa. Grain refinement and dislocation tangling make the major contribution to the strength improvement. However, there is a gradual decrease in elastic modulus along with the increasing HPT revolutions, which may be due to the dislocation tangling and residual stress. The relationship between stress and equivalent strain during HPT was established based on the stress-strain curves obtained by simulation results, and the hardening behavior during HPT processing was discussed.