TiPd, TiPd-Fe 合金のマルテンサイト変態と内部組織(<特集>チタンおよびチタン合金)

概要

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The crystal structures, internal structure and shape memory effect of the TiPd and TiPd-Fe martensitic alloys were investigated by electron microscopy and tensile testing. The B19(2H) martensite which was found in the earlier X-ray investigation was found to exist in both the TiPd alloy and the TiPd-Fe alloys. The internal structure of this martensite was found to be (111)_<2H> twin. By substituting palladium by iron (the content of titanium is fixed at 54 at%), the M_S temperature decreases with increasing iron content. In the iron added alloys with 4, 5 and 6 at%Fe, a new martensite phase with 9R structure was found to exist in addition to the twinned B19(2H) martensite. In the alloys with 7 and 8 at%Fe, an "intermediate phase" which is very similar to the "incommensurate phase" in TiNi alloys was found to exist. Additional "superlattice" diffraction spots of this phase lie on 0.3n{110}_<B2> (7at%Fe), and 0.28n{110}_<B2> (8 at%Fe), (n : integer). The shape memory effect and pseudoelastic behaviour of the polycrystalline specimens of the 54Ti-39Pd-7Fe and 54Ti-38Pd-8Fe alloys were investigated by tensile testing. Recoverable strain by shape memory effect was about 1% (percentage of recovery 100%) and pseudoelastic strain 3%, in both the alloys.
社団法人日本鉄鋼協会の論文
1986-04-01