Journal Article

PUBDB-2024-05254

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultrastrong and ductile NiTi-based composite with large recoverable strain mediated by a compositionally complex phase

Geng, J. ; Shi, Y. (Corresponding author) ; Barriobero-Vila, P. ; Jiao, M. ; Cao, Y. ; Tang, Y.Extern* ; He, J. ; Ma, C. ; Ma, Y.Extern* ; Lei, Z. (Corresponding author)Extern* ; Lu, Z. (Corresponding author)

2024
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.apmt.2024.102347  doi:10.3204/PUBDB-2024-05254

Abstract: NiTi-based composites possess great potential for concurrently improving both mechanical and functional properties. However, relying on traditional alloy design principles limits the design space and greatly hinders the advancement of high-performance NiTi-based composites. The concept of high-entropy alloys has expanded the compositional landscape, unveiling unique structural characteristics for alloy design and providing new prospects for addressing these limitations. Here, we report a compositionally complex NiTi-based composite that exhibits exceptional strength and ductility, along with remarkable recoverable strain. The composite, Ni$_{40}$Ti$_{40}$(NbMoTaW)$_{20}$ (at.%), comprises a 78.0 % B2 NiTi matrix, a 19.2 % Nb-Mo-Ta-W-Ti-Ni compositionally complex body-centered cubic (BCC) phase, and a small amount of Ti2Ni. Notably, this composite demonstrates an engineering compressive strength of 3274 MPa, with a compressive fracture strain of 44.2 % and a maximum recoverable strain of 7.3 % (5.6 % elastic strain and 1.7 % inelastic recoverable strain). These outstanding mechanical properties result from the unique structural characteristics of the compositionally complex phase and the lattice strain matching induced by phase transitions. The substantial recoverable strain was obtained through the reversible B2⇌R⇌B19′ phase transition. This work not only innovates a new category of high-performance NiTi-based composites but also extends the applicability of the high-entropy concept.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20221372 EC (I-20221372-EC) (I-20221372-EC)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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