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Nano Research 2023, 16(11): 12800-12808 https://doi.org/10.1007/s12274-023-6186-9
Research Article | Issue | Published: 18 October 2023

Thermally-triggered grain boundary relaxation in a nanograined Ni-Mo-W alloy

Show Author's Information Dongsong Zeng1,2,  Jiongxian Li1,  Yinong Shi1( ),  Xiuyan Li1,  Ke Lu1
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Keywords:
stacking fault energy, thermal stability, ternary alloy, grain boundary relaxation, nanograined
Topics:
Nanocrystalline alloys
Cite this article:
Zeng D, Li J, Shi Y, et al. Thermally-triggered grain boundary relaxation in a nanograined Ni-Mo-W alloy. Nano Research, 2023, 16(11): 12800-12808. https://doi.org/10.1007/s12274-023-6186-9
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Abstract Full text About this article

Conventionally, nanograined metals and alloys can be stabilized through segregating foreign elements at grain boundaries (GBs). Yet such an effect may be offset by formation of second phase at elevated temperatures. In this paper, by introducing minor W into a binary Ni-Mo alloy, we found precipitation of intermetallic phases was suppressed, enhancing thermal stability of the nanograined structure. Characterized faceted GBs and a high-fraction of Σ3 coincidence site lattice (CSL) boundaries illustrate that GB structures are relaxed by formation of copious annealing twins. Adding W reduces stacking fault energy of the solid solution and facilitates the thermally-triggered GB relaxation. Suppressed precipitation of the intermetallic phases may be attributed to depletion of solutes at relaxed GBs.


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About this article

Thermally-triggered grain boundary relaxation in a nanograined Ni-Mo-W alloy

Show Author's information Dongsong Zeng1,2, Jiongxian Li1, Yinong Shi1( ), Xiuyan Li1, Ke Lu1
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Abstract

Conventionally, nanograined metals and alloys can be stabilized through segregating foreign elements at grain boundaries (GBs). Yet such an effect may be offset by formation of second phase at elevated temperatures. In this paper, by introducing minor W into a binary Ni-Mo alloy, we found precipitation of intermetallic phases was suppressed, enhancing thermal stability of the nanograined structure. Characterized faceted GBs and a high-fraction of Σ3 coincidence site lattice (CSL) boundaries illustrate that GB structures are relaxed by formation of copious annealing twins. Adding W reduces stacking fault energy of the solid solution and facilitates the thermally-triggered GB relaxation. Suppressed precipitation of the intermetallic phases may be attributed to depletion of solutes at relaxed GBs.

Keywords: stacking fault energy, thermal stability, ternary alloy, grain boundary relaxation, nanograined

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Publication history
Copyright
Acknowledgements

Publication history

Received: 23 July 2023
Revised: 04 September 2023
Accepted: 11 September 2023
Published: 18 October 2023
Issue date: November 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

The authors are grateful for financial support from the Ministry of Science and Technology of China (No. 2017YFA0204401), Liaoning Revitalization Talents Program (No. XLYC1808008), and Liaoning Science and Technology Development Program (No. 2021JH6/10500102).

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