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Behavior and Preparation of Single Crystal of Cu-Al-Ni-Be SMA

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Abstract:

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.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

1463-1466

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.1463

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Online since:

October 2007

Authors:

Hua Ping Xu, Hui Hu, Gao Feng Song, Chong He Li, Xie Min Mao

Keywords:

CuAlNiBe, Fatigue Property, Shape Memory Alloy Actuator, Single Crystal, Super Elasticity, Unidirectional Solidification

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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