<報文>液体急冷したTiNi合金の形状記憶効果とマルテンサイト変態

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In order to clarify the existence of the shape memory effect and the behavior of the martensite transformation, optical microscopic observation, 180°-contact bending test, differential scanning calorimetry, and X-ray diffraction were made for rapidly quenched TiNi alloys. The results obtained are as follows : 1) Morphology of grains in the as-quenched ribbons was anisotropic : extending as much as 70μm in width along the longitudinal direction and subdividing into 10〜30μm in width along perpendicular to the longitudinal direction of the ribbons. This morphology was not varied with annealing at 873K for 14.4ks. 2) The Ms temperature of the as-quenched ribbon, which decreased with an increase or the Ni concentration, was 10〜20K lower than that of the bulk TiNi alloys, with an exception of the as-quenched 51.0Ni ribbon, the Ms temperature of which was lower than 120K. It was noteworthy that an additional 5〜7K drop in the Ms temperature could be obtained by annealing at 873K for 14.4ks. 3) Below the Ms temperature the as-quenched ribbons were not broken by 180°-contact bending and recovered to the original shape by heating, i.e., it showed the shape memory effect. 4) Concerning the as-quenched ribbons obtained in this experiment, no amorphous component could be detected in X-ray diffraction patterns. On the roll-contacting surface in the as-quenched 50.0 Ni ribbon, two-step transformation (CsCl type cubic parent phase → rhombohedral martensite phase → monoclinic martensite phase) appeared owing to the effect of rapid quenching. 5) It was observed that the concentration of silicon and oxygen dissolved from the quartz tube into the ribbons increased with an increase of holding time during the molten state of the parent materials. This contamination resulted in straightening an external view and refining the grain size in the as-quenched 50.0 Ni ribbon.
東北大学の論文
1983-03-22

<報文>液体急冷したTiNi合金の形状記憶効果とマルテンサイト変態

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