Behavior and Preparation of Single Crystal of Cu-Al-Ni-Be SMA
In this paper, single crystal of CuAlNiBe shape memory alloy (SMA) was prepared in a high temperature gradient directional solidification furnace with a selective growing crystallizer. And its performance characters were systematically studied. The results show that the mechanical and shape memory properties of the single crystal of CuAlNiBe SMA alloy has much better than that of the polycrystalline material. This may be explained that the stress concentration at grain boundary caused by the difference of bilateral strains is the dominant reason of deterioration of fatigue properties; therefore single crystal alloy possesses the excellent properties duo to its elimination of grain boundary.
Young Won Chang, Nack J. Kim and Chong Soo Lee
H. P. Xu et al., "Behavior and Preparation of Single Crystal of Cu-Al-Ni-Be SMA", Materials Science Forum, Vols. 561-565, pp. 1463-1466, 2007