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Effect of reactive element yttrium on the isothermal oxidation behavior of aluminide coatings on TiNi shape memory alloys
Clc Number:

TG139.6 TG156.86

Fund Project:

Young Academic Backbone Teacher Support Program of Heilongjiang Province Education Department (1253G051); Youth Assistance Program of Heilongjiang University of Science and Technology

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    Abstract:

    Ti-Ni shape memory alloys with and without Y were aluminized at 650℃ using pack-cementation method. The influence of various amounts of Y addition on the microstructure and isothermal oxidation behaviors of aluminide coatings in air at 700℃ was investigated. The aluminide coatings exhibited double layer structure even the aluminization progress is mainly controlled by inward diffusion of Al. Addition of Y promotes the growth of outer TiAl3 layer, but retards the growth of inner NiAl3 layer when Y is below 1at. %. Isothermal oxidation result indicated that the addition of 0.5 at. %Y significantly reduced scale growth rate. In contrast, 1at. %Y and 5at. % Y addition significantly increased the oxidation rate, especially the latter. The effect of Y on the coating formation and the coating oxidation behavior was discussed in details.

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[xujiawen, liuailian, wangyongdong, zhouyuebo. Effect of reactive element yttrium on the isothermal oxidation behavior of aluminide coatings on TiNi shape memory alloys[J]. Rare Metal Materials and Engineering,2016,45(6):1413~1418.]
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History
  • Received:June 03,2015
  • Revised:October 18,2015
  • Adopted:December 11,2015
  • Online: October 08,2016