<報文>TiNi合金のマルテンサイト変態に及ぼす酸素の影響ならびに欠陥構造の同定

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In order to clarify the effect of oxygen content on the martensite transformation and to determine the defect structure in TiNi alloys, differential scanning calorimetory, optical microscopic study, X-ray diffraction and density measurements have been performed on TiNiO and TiNi alloys. The results are as follws : 1) When the annealing temperature was above 700K, the Ms temperature of TiNiO alloys decreased linearly with an increase of the oxygen concentration by the experimental equation Ms/K=(351.4±0.5)-(92.63±0.93)×(Xo/mol%) where Xo=0.13〜1.06mo1%. 2) As a result of Ti_4Ni_2O oxide precipitated in TiNiO alloy, the Ni concentration in the TiNi phase increased relatively to the total Ni concentration ; therefore, the Ms temperature decreased. 3) The saturated oxygen concentration in the TiNi phase was determined 0.045mol%, whereas the eutectic oxygen concentration between the TiNi phase and the Ti_4Ni_2O oxide was evaluated 0.94mol%, based on the results by optical microscopy. 4) X-ray diffraction and density measurement suggested that the defect structure of the parent phase is considered the substitute type over off-stoichiometric composition of the TiNi phase.Ti-Ni AlloyShape Memory AlloyMartensitic TransformationTransformation TemperatureImpurityOxygenTi_4Ni_2O oxideoff-stoichiometricDefect StructureSubstitute
東北大学の論文
1985-09-30