Characterization of the Martensitic Transformation in NiPtAl Alloy Using Digital Holographic Imaging

Thiesing, Benjamin P.; Dryepondt, Sebastien; Leonard, Donovan; Dinwiddie, Ralph B.; Mann, Christopher J.

doi:10.1007/s11661-018-4866-y

Title: Characterization of the Martensitic Transformation in NiPtAl Alloy Using Digital Holographic Imaging

Journal Article · 13 August 2018 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI: https://doi.org/10.1007/s11661-018-4866-y · OSTI ID:1474533

Thiesing, Benjamin P. ^[1]; Dryepondt, Sebastien ^[2]; Leonard, Donovan ^[2]; Dinwiddie, Ralph B. ^[2]; Mann, Christopher J. ^[1]

Northern Arizona Univ., Flagstaff, AZ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Surface reliefs due to phase transformations in a 56.8Ni-5.6Pt-37.6Al at. pct alloy were characterized in situ using digital holographic imaging during thermal cycling from room temperature up to 405 K (132 °C). The 3D images of the surface revealed that the austenite plates formed during heating are exactly the same for each cycle, which is not the case for the martensite plates formed during cooling. The martensite start temperature was found to vary by up to ~ 20 K from one grain to another within the same specimen. The absence of Ni₃Al γ' precipitates, due to the relatively high Al content, results in the propagation of the martensitic transformation over grains up to a millimeter in size. Bright-field optical imaging showed the formation of large martensite plates in some grains, with cracks perpendicular to these plates, upon cycling. Cracks were also observed at grain boundaries and could be related to the height variations across the grain boundaries.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1474533

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 11 Vol. 49; ISSN 1073-5623

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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