<title>Innovative system of high-temperature shape memory alloys</title>

Abstract

A new high temperature shape memory alloy system based on the Ni50Ti50-XHfX has been successfully developed. The experimental results show that the martensite transformation temperature increases significantly with an increase in Hf content. The elevating effect of Hf on the phase transformation temperature is much higher than that of Pd. The Af phase transformation temperature can reach as high as 503 degree(s)C when the Hf content is 25%. Examination of the one-way shape memory effect displays that the fully reversible strain decreases slightly as the Hf content increases, but the alloy also possesses a relatively high fully reversible strain even though the Hf content is 25%. It was also found that the new high temperature shape memory alloys demonstrate a very good two-way shape memory effect after proper training.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.