Evaluating Binary Molybdenum Alloys as Strong and Ductile High-Temperature Materials
Cheng Fu, Jiayi Yan, Jiang Yu, Yuhong Ren, Sha Li
TL;DR
This paper explores binary molybdenum alloys to find strong and ductile high-temperature materials that could rival Ni-base superalloys.
Contribution
A novel workflow combining computational methods identifies promising Mo-based alloys with improved ductility and strength.
Findings
Three binary systems (Mo-B, Mo-C, Mo-Si) are suitable for precipitation strengthening.
Mo-Re is identified as a solid-solution strengthened alloy with unique ductility improvement.
The workflow can be applied to other bcc refractory alloys for high-temperature applications.
Abstract
Molybdenum alloys as refractory alloys can provide strength levels at operating temperatures higher than that of Ni-base superalloys, yet their ductility is usually inferior to Ni-base alloys. Currently, commercialized Mo alloys are much fewer than Ni alloys. The motivation of this work is to explore opportunities of discovering useful alloys from the usually less investigated binary Mo-X systems (X = alloying element). With computational thermodynamics (CALPHAD), first-principles calculation, and mechanistic modeling combined, in this work a large number of Mo-X binary systems are investigated in terms of thermodynamic features and mechanical properties (yield strength, ductility, ductile-brittle transition temperature, creep resistance, and stress-strain relationship). The applicability of the alloy systems as solution-strengthened or precipitation-strengthened alloys is investigated.…
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Taxonomy
TopicsHigh Temperature Alloys and Creep · Intermetallics and Advanced Alloy Properties · Nuclear Materials and Properties