The role of ternary alloying elements in eutectoid transformation of U10Mo alloy part I. Microstructure evolution during arc melting and subsequent homogenization annealing in U9.8Mo0.2 X alloy ( X = Cr, Ni, Co)

Jana, Saumyadeep; Sweet, Lucas; Neal, Derek; Schemer-Kohrn, Alan; Agnew, Sean; Lavender, Curt; Joshi, Vineet

doi:10.1016/J.JNUCMAT.2018.06.024

The role of ternary alloying elements in eutectoid transformation of U10Mo alloy part I. Microstructure evolution during arc melting and subsequent homogenization annealing in U9.8Mo0.2 X alloy ( X = Cr, Ni, Co)

Journal Article · Mon Jun 18 00:00:00 EDT 2018 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/J.JNUCMAT.2018.06.024· OSTI ID:1457748

Jana, Saumyadeep ^[1]; Sweet, Lucas ^[1]; Neal, Derek ^[1]; Schemer-Kohrn, Alan ^[1]; Agnew, Sean ^[2]; Lavender, Curt ^[1]; Joshi, Vineet ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Univ. of Virginia, Charlottesville, VA (United States)

This paper describes the microstructural evolution in an alloy of uranium with 10 wt.% molybdenum (U10Mo), with minor addition of a third alloying element, namely, Cr, Ni, or Co, at 0.2 wt.%. The microstructures of arc-melted buttons in the as-cast condition show significant Mo segregation. The segregation behavior of Cr, Ni, and Co was investigated through detailed scanning electron microscope imaging. A homogenization heat treatment at 900°C for 48 h results in uniform Mo distribution and associated grain growth in all of the four alloys that were fabricated. Further, formation of multiple phases was noted in U-9.8 wt.% Mo-0.2 wt.% Ni and U-9.8 wt.% Mo-0.2 wt.% Co alloys after the homogenization annealing step. The greatest grain-boundary-initiated eutectoid transformation as measured by % volume fraction was observed when the homogenized U-9.8 wt.% Mo-0.2 wt.% Ni alloy was aged at 500°C for 20 h. The least eutectoid transformation occurred in U10Mo.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1457748

Alternate ID(s):: OSTI ID: 22752172
OSTI ID: 1691922

Report Number(s):: PNNL-SA--132976; PII: S0022311518303829

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 509; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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