X線回折と回折パターンシミュレーションによるNi-Ti形状記憶合金の結晶学的検討

概要

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The martensitic transformation of Ni-Ti shape memory alloy was investigated by X-ray diffraction analysis aided X-ray diffraction pattern simulation. Using the wire shape samples the X-ray diffraction patterns were measured at every 10℃ from 0℃ to 80℃. The software that simulated the X-ray diffraction patterns using by the data of already known lattice constants was developed on the basis of the Bragg's law and the intensity laws. First we confirmed that the X-ray pattern measured by arranging wire samples and attaching the sample holder coincided that of the powder method. Next the X-ray pattern at austenite phase (80℃) was compared with the simulated pattern of B2 crystal structure by the program and the state was identified as B2 structure. On the other hand at martensite phase (0℃) B2 and B19' structures were mixed in the crystal. Although the shape memory effect was expressed at this environ-mental temperature, it is considered that not only B19' structure but B2 structure is also related to the effect of shape memory effect.
社団法人日本材料学会の論文
2005-06-15