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张文,李来平,程军,胡忠武,高选乔,赵彬,张平祥.Mo-Nb单晶的热变形行为及本构方程[J].稀有金属材料与工程(英文),2018,47(1):207~213.[ZhangWen,Li Laiping,Cheng Jun,Hu Zhongwu,Gao Xuanqiao,Zhao Bin and Zhang Pingxiang.Hot Deformation Behavior and Constitutive Equation of Mo-Nb Single Crystals[J].Rare Metal Materials and Engineering,2018,47(1):207~213.]
Hot Deformation Behavior and Constitutive Equation of Mo-Nb Single Crystals
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Received:April 26, 2017  Revised:September 15, 2017
DOI:
Key words: Mo-Nb single crystals  Constitutive equation  Hot compression
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ZhangWen,Li Laiping,Cheng Jun,Hu Zhongwu,Gao Xuanqiao,Zhao Bin and Zhang Pingxiang  
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Abstract:
      Isothermal compression of the Mo-Nb single crystals was conducted on a Gleeble-3800 thermal simulator at the deformation temperature range of 1100-1300℃with strain rates ranging from 0.001 to 10s-1 and height reduction of 50%, true strain is 0.7. The results show that the deformation temperature and strain rates affected the flow stress during the thermal deformation of Mo-Nb single crystals significantly. The true stree-strain curves exhibit a peak flow stress, flow softening and steady flow behavior. The constents of Mo-Nb single crystals, such as the activation energy Q, the stress exponent n, are calculated. The constitutive equation is estabilished based on a hyperbolic-sine equations of Arrhenius type.