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High-temperature deformation behavior of tantalum carbide, TaC_<0.78>, prepared by the floating zone technique with radio-frequency induction heating, is investigated. It is found that the crystals be...come appreciably ductile above 1600 K and exhibit a marked work softening phenomenon, which is characteristic of covalent-bonded crystals such as Ge and Si. The phenomenon becomes less clear with decreasing strain rate. The mechanical equation of state at the yield stress can be expressed by ε^^・_P＝A(σ_y/E(^mezp(-Q/(RT)), where m＝3.8 and Q＝370 kJ/mol in the temperature range 1600 to 2320 K. The value of Q is close to the activation energy for carbon diffusion in TaC.続きを見る
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Mendeley出力
