We present the order-disorder transition temperatures for bcc Cu-Zn-Al shape-memory alloys measured by means of calorimetric and resistometric techniques. The investigation includes the line of compositions Cu 0.76−x/2 -Zn x -Al 0.24−x/2 ͑0 ഛ x ഛ 0.48͒, i.e., the line with a constant conduction electron per atom ratio, e / a = 1.48. Experimental results are confronted with Monte Carlo simulations based on the Blume-Emery-Griffiths Hamiltonian. A set of exchange energies in first and second neighbors is calculated, which allows in close agreement reproduction of the experimental phase diagram.

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