An electron backscatter diffraction analysis of grain boundary initiated discontinuous precipitation in U-10Mo

JOURNAL OF NUCLEAR MATERIALS

卷:529

Article

Overman, N. R.¹  Jana, S.¹  Field, D. P.²  Lavender, C.¹  Joshi, V. V.¹ 

[1] Pacific Northwest Natl Lab, POB 999, Richland, WA 99354 USA

[2] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA

关键词: Discontinuous precipitation;    Uranium;    Electron backscatter diffraction (EBSD);    Grain boundary;    Phase transformation;   

DOI  :  10.1016/j.jnucmat.2019.151940

来源: Elsevier

【 摘 要 】

The effect of varied thermomechanical processing on discontinuous precipitation (DP) in U-10Mo was investigated, with specific emphasis on understanding the role of grain boundary misorientation in DP. Varied prior homogenization heat treatment and thermomechanical processing resulted in differences in both the fraction of DP and the colony width, and was attributed to variations in the grain boundary misorientation distribution. Regardless of the degree of DP-based transformation, extensive growth of DP colonies was dominant on 30 degrees-45 degrees misorientation boundaries. Interestingly, misorientation histograms of the deformed and annealed specimens suggest the processing steps involved may have inhibited DP colony growth along a small fraction of these high angle boundaries. Large-area electron backscatter diffraction montages coupled with high resolution mapping suggest symmetric {110}-type interfaces may be important considerations for mitigating extensive DP growth in this alloy system. (C) 2019 Elsevier B.V. All rights reserved.

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