Abstract
Athermal and stress-induced martensitic transformations are examined in various alloys of the large family which exhibit the unique “memory” and/or “superelastic” shape memory effects (SME). Such mechanical effects are found to be intimately related to details of the martensitic and premartensitic reaction paths in each system. A common feature of various “uncommon” systems is that the usual phenomenological crystallographic analysis cannot completely describe the martensitic transformation in these systems. Addiional features represented by lattice “shuffles” or low-wavelength lattice waves, and the mechanistic role of transformation dislocations are examined. A common thread in various systems such as TiNi, CuZn, AuCd, In-Tl, and so forth, is viewed in terms of evidence related to alloying (electronic entropy) effects on lattice instability of the parent phase. Instability reflected by premonitory phenomena can be given considerable generality when related to observations in systems which exhibit similar dynamic lattice transitions, such as the second-order “athermal omega” lattice transition in Group IV-base systems. The importance of reversibility in martensitic transformation of SME alloys is emphasized. Comparisons with more common non-SME martensitic alloys are made.
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This paper is based on a presentation made at a symposium on “Phase Transformations in Less Common Metals: A Dialogue,” held at the Fall Meeting in Cleveland on October 16, 1972, under the sponsorship of the Phase Transformations Activity, Materials Science Division, American Society for Metals.
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Perkins, J. Lattice transformations related to unique mechanical effects. Metall Trans 4, 2709–2721 (1973). https://doi.org/10.1007/BF02644571
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DOI: https://doi.org/10.1007/BF02644571