Journal Article

FZJ-2022-02737

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Massive interstitial solid solution alloys achieve near-theoretical strength

Liu, C. ; Lu, W. ; Xia, W. ; Du, C. ; Rao, Z. ; Best, J. P. ; Brinckmann, S.FZJ* ; Lu, J. ; Gault, B. ; Dehm, G. ; Wu, G. ; Li, Z. ; Raabe, D. (Corresponding author)

2022
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/31542  doi:10.1038/s41467-022-28706-w

Abstract: Interstitials, e.g., C, N, and O, are attractive alloying elements as small atoms on interstitial sites create strong lattice distortions and hence substantially strengthen metals. However, brittle ceramics such as oxides and carbides usually form, instead of solid solutions, when the interstitial content exceeds a critical yet low value (e.g., 2 at.%). Here we introduce a class of massive interstitial solid solution (MISS) alloys by using a highly distorted substitutional host lattice, which enables solution of massive amounts of interstitials as an additional principal element class, without forming ceramic phases. For a TiNbZr-O-C-N MISS model system, the content of interstitial O reaches 12 at.%, with no oxides formed. The alloy reveals an ultrahigh compressive yield strength of 4.2 GPa, approaching the theoretical limit, and large deformability (65% strain) at ambient temperature, without localized shear deformation. The MISS concept thus offers a new avenue in the development of metallic materials with excellent mechanical properties.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 1241 - Gas turbines (POF4-124) (POF4-124)

Appears in the scientific report 2022

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