Pseudoelasticity in Au-Cd thermoelastic martensite

  • Nakanishi N
  • Mori T
  • Miura S
 et al. 
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Abstract

Thermoelastic martensitic transformation has been studied by the analysis of stress-strain curves in binary Au-Cd alloys, containing 46.5, 47.5, 48.5, 49, 49.5, and 50 at.% Cd, respectively. The pseudoelastic characteristics, i.e. superelastic and ferroelastic behaviour upon tension-compression test and that the origin of the shape memory effect bears a close relation to the ferroelastic loop, have been explained on the basis of the lattice softening, that is, the shear elastic constant, C'=(C11-C12)/2, decreases toward zero in the vicinity of the transition temperature. In particular the critical condition for obtaining the ferroelastic loop can be experimentally determined by assuming a critical stress, which is termed `ferroelastic limit'. The ferroelastic limit may depend upon the elastic anisotropy of alloys and lies in the region 6 Kg/mm2 in the Au-Cd alloy

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Authors

  • N. Nakanishi

  • T. Mori

  • S. Miura

  • Y. Murakami

  • S. Kachi

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