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Accelerated sintering in phase-separating nanostructured alloys

Author

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  • Mansoo Park

    (Massachusetts Institute of Technology)

  • Christopher A. Schuh

    (Massachusetts Institute of Technology)

Abstract

Sintering of powders is a common means of producing bulk materials when melt casting is impossible or does not achieve a desired microstructure, and has long been pursued for nanocrystalline materials in particular. Acceleration of sintering is desirable to lower processing temperatures and times, and thus to limit undesirable microstructure evolution. Here we show that markedly enhanced sintering is possible in some nanocrystalline alloys. In a nanostructured W–Cr alloy, sintering sets on at a very low temperature that is commensurate with phase separation to form a Cr-rich phase with a nanoscale arrangement that supports rapid diffusional transport. The method permits bulk full density specimens with nanoscale grains, produced during a sintering cycle involving no applied stress. We further show that such accelerated sintering can be evoked by design in other nanocrystalline alloys, opening the door to a variety of nanostructured bulk materials processed in arbitrary shapes from powder inputs.

Suggested Citation

  • Mansoo Park & Christopher A. Schuh, 2015. "Accelerated sintering in phase-separating nanostructured alloys," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7858
    DOI: 10.1038/ncomms7858
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    Cited by:

    1. Li, Dongfang & Qu, Xiaoxiao & Li, Junjie & Hong, Suck Won & Jeon, Chung-hwan, 2022. "Microstructural development of product layer during limestone sulfation and its relationship to agglomeration in large-scale CFB boiler," Energy, Elsevier, vol. 238(PC).
    2. Chang Liu & Jing Rao & Zhongji Sun & Wenjun Lu & James P. Best & Xuehan Li & Wenzhen Xia & Yilun Gong & Ye Wei & Bozhao Zhang & Jun Ding & Ge Wu & En Ma, 2024. "Near-theoretical strength and deformation stabilization achieved via grain boundary segregation and nano-clustering of solutes," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    3. Yannick Naunheim & Christopher A. Schuh, 2024. "Multicomponent alloys designed to sinter," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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