Abstract
The stability between the high temperature β phase and the orthorhombic martensite in CuZn and CuZnAl single crystals is analyzed. Experimental results for high electron concentrations ( e/ a > 1.50) and data from the literature for lower e/ a are used, covering a wide range of compositions. Numerical values for the differences of entropy and enthalpy are reported. Also, the contribution of L2 1 order to the phase stability is evaluated and an estimation of pair interchange energies is obtained.
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