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Influence of hydrogen content on microstructure and crystallographic orientation of hydrides in recrystallized Zr-Sn-Nb tubes
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1.School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology;2.School of Materials Science and Engineering, Chongqing University;3.School of Materials Science and Engineering,Chongqing University

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Study on the influence mechanism of precipitation behavior and pre deformation of the second phase of zirconium alloy;Study on deformation, phase transition and toughening of metal materials;The method and mechanism for strengthening and toughening of a new zirconium alloy

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    Abstract:

    Although there are many studies on the hydrides in Zirconium alloys, the microstructure and crystallographic orientation of hydrides with higher hydrogen content has received little attention. The Zr-Sn-Nb alloy charged with 147, 340 and 1480 ppm of hydrogen by gaseous hydriding procedure at 400 ℃ with different holding time. The microstructure and crystallographic orientation of hydrides is investigated by a combination of optical microscopy (OM), scanning electron microscope (SEM), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) techniques. The results indicate that the orientation is affected by the hydrogen content. The interphase boundary components are used to evaluate the crystallographic orientation of hydrides along with pole figure analyses. We found that there are two orientation relationships between the α-Zr and the hydrides, i.e. (0001)α∥{111}δ and {10-17}α∥{111}δ. EBSD analyses also revealed changes in the orientation of hydrides when hydrides grew from one matrix grain to another to accommodate the matrix modification. Besides, there are many Zr grains with both inter-granular and intra-granular hydrides, and only the intra-granular hydrides exhibit habit relationships with the Zr grains.

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[Zeng Wen, Qiu Risheng, Luan Baifeng, Tao Boran, Liu Qing, Murty Korukonda L.,Peng Sheng, Wang Ben, Gao Bo, Fang Qiang. Influence of hydrogen content on microstructure and crystallographic orientation of hydrides in recrystallized Zr-Sn-Nb tubes[J]. Rare Metal Materials and Engineering,2019,48(5):1361~1370.]
DOI:10.12442/j. issn.1002-185X.20171175

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History
  • Received:December 19,2017
  • Revised:March 20,2019
  • Adopted:January 10,2019
  • Online: June 04,2019
  • Published: