Compositional Modifications to Alter and Suppress Laves Phases in AlxCrMoTayTi Alloys

Mann, Austin E.; Newkirk, Joseph W.

doi:10.1002/adem.202201614

Compositional Modifications to Alter and Suppress Laves Phases in Al_xCrMoTa_yTi Alloys

Journal Article · Sat Mar 25 00:00:00 EDT 2023 · Advanced Engineering Materials

DOI:https://doi.org/10.1002/adem.202201614· OSTI ID:1962467

^[1]; Newkirk, Joseph W. ^[2]

Boeing Company, Seattle, WA (United States); Missouri Univ. of Science and Technology, Rolla, MO (United States); Boeing Research & Technology
Missouri Univ. of Science and Technology, Rolla, MO (United States)

The development of refractory complex concentrated alloys in the Al–Cr–Mo–Ta–Ti alloy system is reported. Alloys with modified Al and Ta concentrations are designed using CALPHAD tools and produced via arc melting and characterized in both as-cast and annealed forms. Properties of the alloys, nature of the microstructures, and phase transformation behavior are described via X-ray diffraction, microstructural characterization, microhardness, and differential scanning calorimetry. Two alloys, namely, Al_0.25CrMoTa_0.8Ti and Al_0.75CrMoTa_0.8Ti, are represented by a body-centered-cubic matrix phase after annealing, along with a secondary Cr–Ta Laves phase of the C15 and C14 polytypes, respectively. In as-cast and annealed forms, the Al_0.75CrMoTa_0.45Ti alloy comprises a single-bcc phase. Microhardness of the Laves phase containing alloys demonstrates susceptibility to cracking, whereas the Al_0.75CrMoTa_0.45Ti alloy displays high specific hardness, signs of ductility as evidenced by slip traces near indentations, and minimal scatter of hardness values.

View Accepted Manuscript (DOE)

Research Organization:: Boeing Company, Seattle, WA (United States)

Sponsoring Organization:: USDOE; USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0001124

OSTI ID:: 1962467

Alternate ID(s):: OSTI ID: 1983362

Journal Information:: Advanced Engineering Materials, Journal Name: Advanced Engineering Materials Journal Issue: 14 Vol. 25; ISSN 1438-1656

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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