Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7210555 | Rare Metal Materials and Engineering | 2016 | 6 Pages |
Abstract
Tungsten was subjected to severe plastic deformation at 440 °C using high pressure torsion (HPT) with an improved die-set. Microhardness measurements suggest an appreciable ductility level in tungsten after HPT with Vickers microhardness HV as high as â¼11 500 MPa. Differential scanning calorimetry (DSC) analyses show that samples with less strain have a higher recrystallisation temperature (greater than 1450 °C) than samples with more strain (â¼800 °C). X-ray diffraction analyses indicate increases in lattice strain up to 0.35%, lattice parameter up to 0.3177 nm and dislocation density up to 2.4 à 1015 mâ2. The current study introduces the improved HPT process as an effective route for the production of ultrahigh strength W with significant ductility and specified thermostability
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Authors
Liang Chen, Li Ping, Tian Ye, Li Lingfeng, Xue Kemin, Zhao Meng,