Phase transformation and phonon anomalies in Ni{sub 2}MnGa

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Inelastic neutron scattering experiments and transmission electron microscopy have been used to study a single crystal of the Ni{sub 2}MnGa shape memory Hustler alloy in a wide temperature range covering the parent phase (T>T{sub 1}=265 K), a recently discovered pemartensitic (T{sub 1}T>T{sub M}) and martensitic (T<T{sub M}=220 K) phase regions. A temperature-dependent anomaly in the TA{sub 2} phonon dispersion in the parent phase was observed and related to the phase transformations. The premartensitic phase involves a transverse modulation of the parent cubic structure with a simple periodicity of 1/3 [110]. The approximately tetragonal lattice of the low-temperature martensite is distorted ... continued below

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7 p.

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Zheludev, A.; Shapiro, S.M.; Wochner, P.; Schwartz, A.; Wall, M. & Tanner, L.E. July 1, 1995.

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Inelastic neutron scattering experiments and transmission electron microscopy have been used to study a single crystal of the Ni{sub 2}MnGa shape memory Hustler alloy in a wide temperature range covering the parent phase (T>T{sub 1}=265 K), a recently discovered pemartensitic (T{sub 1}T>T{sub M}) and martensitic (T<T{sub M}=220 K) phase regions. A temperature-dependent anomaly in the TA{sub 2} phonon dispersion in the parent phase was observed and related to the phase transformations. The premartensitic phase involves a transverse modulation of the parent cubic structure with a simple periodicity of 1/3 [110]. The approximately tetragonal lattice of the low-temperature martensite is distorted by transverse modulations with incommensurate wave vectors [{zeta}M {zeta}M {sup 0}] and [{sup 2}{zeta}M {sup 2}{zeta}M {sup 0}], {zeta}M {approx}0.43. The observed phenomena are attributed to electron-phonon interactions and anharmonic effects.

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7 p.

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OSTI as DE95015435

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  • 8. international conference on martensitic transformations (ICOMAT-8), Lausanne (Switzerland), 20-25 Aug 1995

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  • Other: DE95015435
  • Report No.: BNL--61945
  • Report No.: CONF-9508145--1
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 100279
  • Archival Resource Key: ark:/67531/metadc618517

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Nov. 24, 2015, 7:15 p.m.

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Zheludev, A.; Shapiro, S.M.; Wochner, P.; Schwartz, A.; Wall, M. & Tanner, L.E. Phase transformation and phonon anomalies in Ni{sub 2}MnGa, article, July 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc618517/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.