Volume 203, Issue 9 pp. 2229-2235

Original Paper

High resolution transmission electron microscopy study on the nano-scale twinning of θ-NiMn precipitates in an Fe–Ni–Mn maraging alloy

S. Hossein Nedjad,

Corresponding Author

S. Hossein Nedjad

[email protected]

Faculty of Materials Engineering, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran

Phone: +98-412-345 80 33, Fax: +98-412-344 43 33Search for more papers by this author

M. Nili Ahmadabadi,

M. Nili Ahmadabadi

School of Metallurgy and Materials Engineering, Faculty of Engineering, University of Tehran, P.O. Box: 14395-731, Tehran, Iran

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T. Furuhara,

T. Furuhara

Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

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T. Maki,

T. Maki

Department of Materials Science and Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

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S. Hossein Nedjad,

Corresponding Author

S. Hossein Nedjad

[email protected]

Faculty of Materials Engineering, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran

Phone: +98-412-345 80 33, Fax: +98-412-344 43 33Search for more papers by this author

M. Nili Ahmadabadi,

M. Nili Ahmadabadi

School of Metallurgy and Materials Engineering, Faculty of Engineering, University of Tehran, P.O. Box: 14395-731, Tehran, Iran

Search for more papers by this author

T. Furuhara,

T. Furuhara

Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

Search for more papers by this author

T. Maki,

T. Maki

Department of Materials Science and Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Search for more papers by this author

First published: 10 July 2006

https://doi.org/10.1002/pssa.200566023

Citations: 20

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Abstract

Precipitation of nanometer-sized fct θ-NiMn intermetallic compound was found to cause age hardening in Fe–10Ni–7Mn (wt%) maraging alloy during isothermal aging at 753 K. High resolution transmission electron microscopy was used to study the substructure of the fct θ-NiMn precipitates in the alloy after aging for 0.36 and 86.4 ks. Nano-scale twins on (111) planes were found in the precipitates of intial and later stages of aging. Precipitation of bcc β-NiMn at 753 K and subsequent martensitic transformation to fct θ-NiMn during cooling to room temperature was suggested. It was also indicated that precipitation of fct θ-NiMn at bcc iron matrix gives rise to high coherency strain energy. The (111) twinning is proposed to accommodate the strain energy of either martensitic transformation or coherency strain of precipitation reaction. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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Volume203, Issue9

July 2006

Pages 2229-2235

High resolution transmission electron microscopy study on the nano-scale twinning of θ-NiMn precipitates in an Fe–Ni–Mn maraging alloy

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High resolution transmission electron microscopy study on the nano-scale twinning of θ-NiMn precipitates in an Fe–Ni–Mn maraging alloy

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