Metallurgical and shape memory characteristics of grain-refined Cu-Zn-Al shape memory alloys

V. Sampath; A. Murugaiyan; Srinivasan M. Sivakumar

doi:10.1117/12.514737

14 October 2003 Metallurgical and shape memory characteristics of grain-refined Cu-Zn-Al shape memory alloys

V. Sampath, A. Murugaiyan, Srinivasan M. Sivakumar

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514737
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

Copper-based shape memory alloys (SMAs) are prone for grain growth during thermomechanical and betatising treatments. The grain growth of the alloy leads to intergranular cracking on quenching to form martensite in the alloy, which in turn leads to poor mechanical properties including corrosion resistance of the alloy. In the present work, grain refinement of a CuZnAl shape memory alloy was done by adding 0.2 to 0.4 wt% of zirconium, titanium and boron as grain refiners. The effect of these additions on the microstructure and shape memory properties of the alloys were studied. The results show that the Zr and Ti additions reduce the grain size from 1.5 mm to 200 μm and 500 μm, repectively. The Zr-added alloy shows good strain recovery and corrosion resistance compared with the alloy in the other conditions.

Citation Download Citation

V. Sampath, A. Murugaiyan, and Srinivasan M. Sivakumar "Metallurgical and shape memory characteristics of grain-refined Cu-Zn-Al shape memory alloys", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514737

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