Journal Article

PUBDB-2026-00547

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Gas tungsten arc welding of NiTi shape memory alloy and $AlCoCrFeNi_{2.1}$ eutectic high entropy alloy using a niobium interlayer

Arthur, N. J. R. S. ; Kim, R. E. ; Kim, H. S.Extern*XFEL.EU* ; Martins, A.Extern* ; Schell, N.HZG*Hereon* ; Oliveira, J. P.Extern*

2026
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.intermet.2026.109177

Abstract: Dissimilar fusion welding of a NiTi shape memory alloy and an AlCoCrFeNi2.1 eutectic high entropy alloy wasperformed using a niobium interlayer. The unique properties of these materials complement each other,potentially enabling hybrid structures for advanced applications and smart systems. Gas tungsten arc weldingwith an arc offset technique was employed to create a weld-braze joint at the NiTi-Nb interface while controllingthe heat input. Comprehensive microstructural and phase analysis was carried out using optical and electronmicroscopy, synchrotron X-ray diffraction, and was further supplemented by thermodynamic simulations.Dissolution of the Nb interlayer altered the solidification pathways in the fusion zone, leading to the formation oftopologically close-packed phases (including C14 Laves and σ) and Ti2Ni. Multiple interfacial reactions at theNiTi interface introduced significant strain, which increased hardness but also acted as stress concentratorsduring tensile loading. The addition of the niobium interlayer enabled the formation of a stable, crack-free joint,whereas welding without an interlayer resulted in catastrophic cracking.

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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-20241103 EC (I-20241103-EC) (I-20241103-EC)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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