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

Abstract

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 Ni 3Al 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.

Authors:
 [1];  [2];  [2];  [2];  [1]
  1. Northern Arizona Univ., Flagstaff, AZ (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1474533
Grant/Contract Number:  
[AC05-00OR22725]
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
[ Journal Volume: 49; Journal Issue: 11]; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Thiesing, Benjamin P., Dryepondt, Sebastien, Leonard, Donovan, Dinwiddie, Ralph B., and Mann, Christopher J. Characterization of the Martensitic Transformation in NiPtAl Alloy Using Digital Holographic Imaging. United States: N. p., 2018. Web. doi:10.1007/s11661-018-4866-y.
Thiesing, Benjamin P., Dryepondt, Sebastien, Leonard, Donovan, Dinwiddie, Ralph B., & Mann, Christopher J. Characterization of the Martensitic Transformation in NiPtAl Alloy Using Digital Holographic Imaging. United States. doi:10.1007/s11661-018-4866-y.
Thiesing, Benjamin P., Dryepondt, Sebastien, Leonard, Donovan, Dinwiddie, Ralph B., and Mann, Christopher J. Mon . "Characterization of the Martensitic Transformation in NiPtAl Alloy Using Digital Holographic Imaging". United States. doi:10.1007/s11661-018-4866-y. https://www.osti.gov/servlets/purl/1474533.
@article{osti_1474533,
title = {Characterization of the Martensitic Transformation in NiPtAl Alloy Using Digital Holographic Imaging},
author = {Thiesing, Benjamin P. and Dryepondt, Sebastien and Leonard, Donovan and Dinwiddie, Ralph B. and Mann, Christopher J.},
abstractNote = {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.},
doi = {10.1007/s11661-018-4866-y},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = [11],
volume = [49],
place = {United States},
year = {2018},
month = {8}
}

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