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Electron Microscopy Studies of Charge Density Wave (CDW) Transitions in Ti58.7Ni37.5Al3.8 Alloy

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Abstract

Electron diffraction and microscopy and electrical resistancevs temperature measurements of a Ti58.7 Ni37.5Al3.8 alloy between room temperature and liquid nitrogen temperature have been carried out. On cooling, the increase in electrical resistance and the appearance of 1/3(110)- and 1/3(111)-type superlattice reflections are interpreted to be due to the formation of three-dimensional CDW’s. The transformation behavior, structural and microstructural changes of the present alloy are similar to those of the “premartensitic” behavior of a Ti50Ni47Fe3 alloy which undergoes “normal-to-incommensurate” and “incommensurate-to-commensurate” CDW transitions, as reported earlier. The substitution of Al for Ni in TiNi and the nonstoichiometry of the present alloy apparently cause the incommensurate phase to exist over a larger temperature range.

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Authors and Affiliations

  1. Department of Metallurgy, Mechanics and Materials Science, Michigan State University, 48824, East Lansing, MI

    C. M. Hwang (Assistant Professor)

  2. Department of Metallurgy and Mining Engineering, and the Materials Research Laboratory, University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    M. Wayman (Professor)

Authors
  1. C. M. Hwang
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  2. M. Wayman
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Formerly with the University of Illinois

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Hwang, C.M., Wayman, M. Electron Microscopy Studies of Charge Density Wave (CDW) Transitions in Ti58.7Ni37.5Al3.8 Alloy. Metall Trans A 15, 1155–1163 (1984). https://doi.org/10.1007/BF02644710

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  • DOI: https://doi.org/10.1007/BF02644710

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