Tweed in Martensites: A Potential New Spin Glass

Details Tweed in Martensites: A Potential New Spin Glass Tweed in Martensites: A Potential New Spin Glass

1992-04-23

arxiv.org/abs/cond-mat/9204012v1

Phys.Scripta T42 (1992) 214

Physics

Condensed Matter

18 pages and four figures (included)

Scientific paper

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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