발간논문

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Vol.29, No.5, 472 ~ 478, 1991
Title
Pseudoelasticity and Cyclic Deformation effect in Ni - Ti alloy
지광구K . K . Jee, 신명철M . C . Shin
Abstract
Pseudoelasticity and cyclic deformation effect in Ni-Ti alloy were studied. A method of predicting σ_M and σ_R - stress for martensitic and reverse transformation above Af temperature, respectively - by the ΔH and the temperature of transformation was newly proposed using Clausius-Clapeyron equation. By cyclic deformation above Af temperature, the σ_M and σ_R decreased due to anisotropic stress field of the dislocations generated during the deformation. With Δσ_M-the quantity of decreased in σ_M-three to four times larger than Δσ_R, Δσ_M increased with test temperature. But Δσ_M did not change with varying the amount of deformation strain. Heat treatment at 300℃ for 30sec after cyclic deformation could recover its original σ_M and σ_R by eliminating the stress field of the dislocations.
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