2107 TiNbAl形状記憶合金の集合組織形成(S06-2 形状記憶合金の特性と応用技術(2),S06 形状記憶合金の特性と応用技術)

概要

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Ti-Nb-Al is one of Ni-free Ti-base shape memory alloys in which shape memory effect is caused by a martensitic transformation from a parent phase of β (bcc) to a martensite phase of α" (c-centered orthorhombic cell). A problem of the Ti-base shape memory alloys is that the intrinsic transformation strain is smaller than that of Ti-Ni practical shape memory alloys. Then, in order to improve apparent shape recovery strain, formation and control of texture developed by thermo-mechanical treatment have been studied using various Ti-Nb-Al alloys. In this paper, texture formation of Ti-22Nb-3Al (in mol%) is described. Sine Ti-22Nb-3Al is α" martensite phase at room temperature, the deformation texture is expected to be different from those of Ti-24Nb-3Al and Ti-26Nb-3Al of which β parent phase is stable at room temperature. It was found by θ-2θ X-ray diffraction analysis that, with increasing cold rolling rate, the intensity from (202)α" martensite was developed and that from (111)α" martensite was decreased. X-ray pole figure analysis revealed that {101}α"<010>α" was strongly developed by cold rolling when the cold reduction rate exceeds 80%.
一般社団法人日本機械学会の論文
2007-09-07