Abstract

The stability between the close packed martensitic structures 6R, 18R and 2H in CuZnAl single crystals is analysed. 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 stacking fault energies and the differences of enthalpy are reported. The thermodynamic stability of the orthorhombic 18R structure with respect to 6R and 2H in a wide composition range is established.

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