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Vickers microhardness measurements are performed on the ordering alloy Cu2NiZn to determine the dependence of the strength upon the quench temperature and the antiphase domain size. The influence of impurities on the strength is investigated by performing the measurements on a highly pure and on a commercial alloy. A maximum in strength as a function of the quench temperature has been found, which is similar of shape and position as reported for Ni3Mn. The extent of domain hardening in Cu2NiZn is rather small, like in Ni3Mn and Ni3Fe. Cu2NiZn, as an alloy with an Ll2 structure, can best be compared with Ni3Fe and Ni3Mn in its mechanical behavior, instead of with Cu3Au. Transmission electron microscopy has revealed that antiphase domain growth in Cu2NiZn obeys a Dn — D 0 n = kt law, where n decreases with increasing temperature, except near the critical temperature Tcl, where the antiphase boundaries align themselves along {100} planes.

Order and Domain Strengthening in Highly Pure and Commercial Cu2NiZn