Oxidation Behaviors of Ti44Ni47Nb9 Shape Memory Alloy at High Temperature

Acta Metall Sin

2005, Vol. 41

Issue (6): 633-637 DOI:

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Oxidation Behaviors of Ti44Ni47Nb9 Shape Memory Alloy at High Temperature

TAO Binwu; LIU Jianhua; LI Songmei

School of Materials Science and Engineering; Beijing University of Aeronautics and Astronautics; Beijing 100083

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TAO Binwu; LIU Jianhua; LI Songmei. Oxidation Behaviors of Ti44Ni47Nb9 Shape Memory Alloy at High Temperature. Acta Metall Sin, 2005, 41(6): 633-637 .

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Abstract The isothermal oxidation resistance of Ti44Ni47Nb9 shape memory alloy (SMA) in air over the temperature range of 450-850 ℃ was studied by using XRD, SEM and EDS techniques. Light oxidation was found on the alloy surface at 450 ℃. The alloy was attacked by oxidation and the oxidation kinetic curves were approximately parabola within the temperature range of 600—800 ℃. Experimental results indicate that a multi-layered scale was formed, consisting of an outer rutile layer, a Nb rich intermediate layer and a thin inner Ni3Ti layer. It was found that the Nb rich intermediate layer was compact, which obviously improved the oxidation resistance of the alloy due to its effective inhibition to diffusion of oxygen and titanium. Furthermore, the internal oxidation of nickel element was also inhibited because of the existence of Nb rich layer, which reduced oxygen concentration in the alloy.

Key words: Ti44Ni47Nb9 shape memory alloy high temperature

Received: 14 September 2004

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2005/V41/I6/633

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