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Tensile properties of Co-added FeCrAl oxide dispersion strengthened alloy

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Title: Tensile properties of Co-added FeCrAl oxide dispersion strengthened alloy
Authors: Zhang, Shenghua Browse this author
Ukai, Shigeharu Browse this author →KAKEN DB
Aghamiri, S. M. S. Browse this author
Oono, Naoko Browse this author →KAKEN DB
Hayashi, Shigenari Browse this author →KAKEN DB
Keywords: FeCrAl
Cobalt addition
Aging treatment
Mechanical properties
Order strengthening
Issue Date: 25-Jan-2021
Publisher: Elsevier
Journal Title: Journal of alloys and compounds
Volume: 852
Start Page: 156956
Publisher DOI: 10.1016/j.jallcom.2020.156956
Abstract: The Co-added FeCrAl oxide-dispersion-strengthened (ODS) alloy developed by the authors enables easy and precise control of the grain morphology and hardness using alpha/gamma phase transformation during manufacturing. The tensile properties of the transformable Co-added FeCrAl-ODS alloy were evaluated, focusing on the oxide dispersion strengthening and B2-type CoAl ordered strengthening at both ambient and elevated temperatures. The oxide particles and B2-type CoAl precipitate were characterized using transmission electron microscopy, and strengthening mechanisms for the oxide particles and CoAl-precipitate were evaluated by hardness and tensile tests at room temperature, 300 degrees C, and 500 degrees C. The theoretically estimated values showed good agreement with the experimental results at RT and 300 degrees C. However, the order strengthening by CoAl precipitates was significantly reduced at 500 degrees C, which was attributed to the increase of thermally activated < 001 > slip in the body-centered cubic matrix. The < 001 > slip weakened the dislocation interaction with CoAl precipitates with the same < 001 > slip system.
Rights: ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 張 聖華

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