Interaction of stress with the martensitic phase transition in A15 compounds Page: 2 of 10
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ON THE INTERACTION OF STRESS WITH THE MARTENSITIC PHASE TRANSITION
IN A15 COMPOUNDS*
David 0. Welch
Division of Metallurgy and Materials Science
Brookhaven National Laboratory
Upton, New York 11973
Recently there has been a resurgence of interest in the effect
of the martensitic phase transition which occurs in many A15 com-
poundsl on superconductivity2 and on elastic and anelastic behav-
ior.3 Since in many practical applications, A15 compounds are sub-
ject to considerable stress and strain, it is of interest to exam-
ine the interaction of stress with the martensitic transition; this
paper is an examination of the effects of stress predicted by a
simple Landau model which successfully describes many features of
the transition and the related temperature dependence of the elas-
tic modulus (cll-cl2)/2.1 Earlier, Pietrass4 has discussed some of
the effects of stress on the phase transition, in the context of a
Landau model, and the present paper is an extension and development
of this theoretical approach. We will focus on the effect of stress
on the temperature ranges of stability and metastability of various
types of martensitic domain and will briefly discuss the non-
linearity of the stress-strain relation in a polycrystalline A15.
SYMMETRIZED STRESSES AND STRAINS
The lattice distortions associated with various types of mar-
tensitic domain'and the effect of different types of stress are
most efficiently characterized i'n terms of symmetrized linear
*Work performed under the auspices of the U.S. Department of Energy
under Contract No. DE-AC02-76CH00016.
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Welch, D.O. Interaction of stress with the martensitic phase transition in A15 compounds, article, January 1, 1981; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1108531/m1/2/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.