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The anomalous strength peak and the transition of slip direction in β-CuZn

1985; Taylor & Francis; Volume: 51; Issue: 3 Linguagem: Inglês

10.1080/01418618508237560

0141-8610

H. Saka, Y. M. Zhu, Masaki Kawase, Akira Nohara, T. Imura,

Copper Interconnects and Reliability

Abstract The macroscopic slip directions of β-CuZn have been determined by studying the reorientation of single crystals with three different initial orientations during tensile deformation, between room temperature and 280°C, where the anomalous strength peak takes place. The macroscopic slip directions below and above T p (the temperature at which the peak in the curve of yield stress versus temperature occurs) were quite different from each other; below T p 〈111〉 slip was predominant, while above T p non- ≥ 111 ≥ slip was predominant. This result was in good agreement with TEM observation of the dislocation structures of β-CuZn deformed below and above T p. Thus, it is concluded that the anomalous strength peak and other peculiar phenomena observed in β-CuZn at high temperatures are to be attributed to a transition of the slip direction.