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李 萍,华雅玲,林泉,王雪,薛克敏.纯钨高压扭转组织与性能的微观尺度分析[J].稀有金属材料与工程(英文),2019,48(7):2220~2224.[Ping Li,Yaling Hua,Quan Lin,Xue Wang and Kemin Xue.Study on Microstructure Evolution and Micro-mechanical Properties of Pure Tungsten During High Pressure Torsion[J].Rare Metal Materials and Engineering,2019,48(7):2220~2224.]
Study on Microstructure Evolution and Micro-mechanical Properties of Pure Tungsten During High Pressure Torsion
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Received:February 01, 2018  Revised:February 07, 2018
DOI:
Key words: pure tungsten, high pressure torsion, microstructure evolution, nano-indentation, micro-mechanical properties
Foundation item:国家自然科学基金资助(项目号51675154,51705118)
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Ping Li,Yaling Hua,Quan Lin,Xue Wang and Kemin Xue  
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Abstract:
      Near-equiaxed fine grains with the average grain size of 1.21 μm of pure tungsten has been fabricated via high pressure torsion (HPT) at the temperature of 550 ℃, under a pressure of 1.5 GPa. The influence of HPT processing at various turning numbers on microstructure and micro-mechanical properties of sintered commercial pure tungsten has been investigated by means of EBSD and nano-indentation experiments. It was found that the pores in material were closed effectively, the grains were refined significantly and the ratio of high angle boundary increased rapidly after HPT processing. Moreover, when the strain was relatively low (at the turning number of 1), there was a preferred grain orientation along <101>, which weakened to disappearing with the strain increasing; when the strain was high (at the turning number of 5), some small dynamic recrystallites generated at grain boundary. In addition, the nanohardness and yield strength increase obviously as the strain increasing, which is due to pores closure, grain refinement, lattice distortion, dislocation density increase and high angle grain boundary formation; the combination of relative density, residual stress and high density dislocation, make the elastic modulus of HPT-processed samples higher than sintered commercial pure tungsten, but decrease slightly as the strain increasing during the processing.