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Tweed in Martensites: A Potential New Spin Glass

James P. Sethna·Sivan Kartha·Teresa Cast'an·James A. Krumhansl
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Abstract

We've been studying the ``tweed'' precursors above the martensitic transition in shape--memory alloys. These characteristic cross--hatched modulations occur for hundreds of degrees above the first--order shape--changing transition. Our two--dimensional model for this transition, in the limit of infinite elastic anisotropy, can be mapped onto a spin--glass Hamiltonian in a random field. We suggest that the tweed precursors are a direct analogy of the spin--glass phase. The tweed is intermediate between the high--temperature cubic phase and the low--temperature martensitic phase in the same way as the spin--glass phase can be intermediate between ferromagnet and antiferromagnet.

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James P. Sethna, Sivan Kartha, Teresa Cast'an, James A. Krumhansl. 1992-04-23. Tweed in Martensites: A Potential New Spin Glass. https://doi.org/10.1088/0031-8949%2F1992%2Ft42%2F034

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