Kinetics of cellular transformation and competing precipitation mechanisms during sub-eutectoid annealing of U10Mo alloys

被引：27
作者：
Jana, S. [1 ]
Devaraj, A. [1 ]
Kovarik, L. [1 ]
Arey, B. [1 ]
Sweet, L. [1 ]
Varga, T. [1 ]
Lavender, C. [1 ]
Joshi, V. [1 ]
机构：
[1] Pacific Northwest Natl Lab, Richland, WA 99352 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 723卷
关键词：
UMo alloys; TTT; Phase transformation; Cellular reaction; WT-PERCENT MO; THERMOMECHANICAL PROCESS OPTIMIZATION; PERCENT AG ALLOY; GAMMA-PHASE; DISCONTINUOUS PRECIPITATION; PERCENT MOLYBDENUM; CRYSTALLIZATION KINETICS; U-10WT-PERCENT MO; URANIUM ALLOYS; METALLIC-GLASS;
D O I：
10.1016/j.jallcom.2017.06.292
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Transformation kinetics of metastable body-centered cubic gamma-UMo phase in U-10 wt.% Mo alloy during annealing at sub-eutectoid temperatures of 500 degrees C and 400 degrees C has been determined as a function of time using detailed microstructural characterization by scanning electron microscopy, X-ray diffraction analysis, scanning transmission electron microscopy, and atom probe tomography. Based on the results, we found that the phase transformation is initiated by cellular transformation at both the temperatures, which results in formation of a lamellar microstructure along prior gamma-UMo grain boundaries. At 500 degrees C, cellular transformation is the main mode of transformation. However, at 400 degrees C, cellular transformation and precipitation of ordered gamma ' U2Mo phase within gamma-UMo grain interior creates a competitive situation. The kinetics of the cellular transformation was found to be very sluggish at 400 degrees C compared to the kinetics observed at 500 degrees C as measured by the transformed area fraction. The hardness of gamma-UMo grain interior also was measured and correlated with the observed microstructural evolution. The implication of these results on the low-enriched U-10 wt.% Mo alloy fuel fabrication process development is discussed. Published by Elsevier B.V.
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收藏
页码：757 / 771
页数：15
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