50Ni50 alloy was changed obviously with Y addition and the grains of Ti-Ni alloy was evidently refined. The oxidation rate was significantly reduced by the addition of 0.5 at. %Y and 1.0 at. %Y due to the inhibition of the fast outward diffusion of Ti by the segregated Y ions. However, the oxidation rate was increased by 5 at.%Y addition since the formation of oxide along the Y-rich phase broke the continuity of the TiO2 scale."/>

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Effect of Y addition on the isothermal oxidation behaviour of a Ti50Ni50 shape memory alloy at 700℃
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College of Material Science and Engineering,Heilongjiang University of Science and Technology,Harbin,College of Material Science and Engineering,Heilongjiang University of Science and Technology,Harbin,College of Material Science and Engineering,Heilongjiang University of Science and Technology,Harbin,College of Material Science and Engineering,Heilongjiang University of Science and Technology,Harbin,College of Material Science and Engineering,Heilongjiang University of Science and Technology,Harbin,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin

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TG139.6 TG146.45

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    Abstract:

    The effect of Y addition on the microstructure and isothermal oxidation behaviour of an equal-atomic Ti-Ni shape memory alloy at 700 ℃ in air was investigated. The results showed that the microstructure of Ti50Ni50 alloy was changed obviously with Y addition and the grains of Ti-Ni alloy was evidently refined. The oxidation rate was significantly reduced by the addition of 0.5 at. %Y and 1.0 at. %Y due to the inhibition of the fast outward diffusion of Ti by the segregated Y ions. However, the oxidation rate was increased by 5 at.%Y addition since the formation of oxide along the Y-rich phase broke the continuity of the TiO2 scale.

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[J. W. Xu, A. L. Liu, S. H. Wang, Y. B. Zhou, H. Zhang, W Cai. Effect of Y addition on the isothermal oxidation behaviour of a Ti50Ni50 shape memory alloy at 700℃[J]. Rare Metal Materials and Engineering,2016,45(9):2246~2252.]
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History
  • Received:August 23,2015
  • Revised:January 14,2016
  • Adopted:February 24,2016
  • Online: October 09,2016
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