open access

https://hdl.handle.net/2115/86644

Tensile properties of Co-added FeCrAl oxide dispersion strengthened alloy

英語

Order strengthening

2021-01-25

Elsevier

Journal of alloys and compounds

852

156956

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.

学術雑誌論文

Accepted Manuscript

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