A new criterion for the initiation of dynamic recrystallization is proposed. The criterion, Zc is the critical value of the Zener-Hollomon parameter when the dynamic recrystallization can initiate. The specimens used in this investigation were the sheets of copper alloys containing 0.1at% each of Ga, Ge, Al, Sn or Au. The Zc decreased by the addition of elements in this order: Ga, Ge, Al, Au and Sn. It is shown that an additional element, which raises static recrystallization temperature, also suppresses dynamic recrystallization.
