Abstract
In this paper, the influence of the average grain size and ordering degree of the parent phase on the starting temperature of thermoelastic martensitic transformation in a Cu-25.62 Zn-3.97 Al0.0018 B (wt%) shape memory alloy is studied. Based on the thermodynamics of phase transformation, a linear relationship between the starting temperature of martensitic transformation and the reciprocal of the square root of grain size is obtained, i.e. M s temperature decreases with increasing grain size, concurrent exactly with the result of electric resistance measurement. Application of Landau's theory gives a quantitative relationship between M s temperature and the ordering parameter of the parent phase, which is well confirmed by the results of X-ray diffraction and electric resistance measurement. Besides, the activation energy of the ordering process in the parent phase of the alloy employed is calculated to be 46 kJ/mol.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call