"Cold Melting" of Invar Alloys

Details "Cold Melting" of Invar Alloys "Cold Melting" of Invar Alloys

2000-11-09

arxiv.org/abs/cond-mat/0011158v2

Physical Review B (2001), 63, 132102

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.63.132102

An anomalously strong volume magnetostriction in Invars may lead to a situation when at low temperatures the dislocation free energy becomes negative and a multiple generation of dislocations becomes possible. This generation induces a first order phase transition from the FCC crystalline to an amorphous state, and may be called "cold melting". The possibility of the cold melting in Invars is connected with the fact that the exchange energy contribution into the dislocation self energy in Invars is strongly enhanced, as compared to conventional ferromagnetics, due to anomalously strong volume magnetostriction. The possible candidate, where this effect can be observed, is a FePt disordered Invar alloy in which the volume magnetostriction is especially large.

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