Journal Article

PUBDB-2025-04290

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microstructure and shape memory behavior of additively manufactured Ti-30Ta high-temperature shape memory alloy fabricated by laser beam powder bed fusion

Lauhoff, C. (Corresponding author)Extern* ; Nobach, M.Extern* ; Medvedev, A. E.Extern*XFEL.EU* ; Boenisch, M.Extern* ; Bowen, Z. ; Shen, X.Extern* ; Bolender, A.Extern* ; Liehr, A.Extern* ; Brudler, S. ; Stark, A.Extern*Hereon* ; Stenzel, M. ; Weinmann, M.Extern* ; Song, W.Extern* ; Xue, W.Extern* ; Molotnikov, A.Extern* ; Niendorf, T.Extern*

2025
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.addma.2025.104973  doi:10.3204/PUBDB-2025-04290

Abstract: Titanium-tantalum (Ti-Ta) based alloys can show a reversible martensitic transformation well above 100 °C, which renders them attractive for actuator applications at elevated temperatures. The present study reports on additive manufacturing of a binary Ti-Ta high-temperature shape memory alloy (HT-SMA) by laser beam powder bed fusion (PBF-LB/M). Cuboids with near-full density of 99.99 % have been processed from pre-alloyed Ti-30Ta (at%) powder feedstock. While ω-phase formation during processing causes a β-phase stabilized solidification microstructure, an adequate post-process solution-annealing (1200 °C / 0.5 h) followed by water quenching promotes the formation of a non-equilibrium phase constitution consisting of the martensitic α″-phase. For this heat-treated material state, superior functional properties with fully reversible strains of 2.7 % at a bias stress of 350 MPa are shown. However, poor functional stability is observed. In line with findings previously reported for conventionally processed material, formation of ω-phase is found to dominate functional fatigue and eventually results in a complete loss of the shape memory effect under cyclic loading conditions. By employing detailed microstructure analysis and thermo-mechanical testing accompanied by high-energy in situ synchrotron diffraction, the fundamental interrelationships between processing, microstructure evolution and shape memory behavior are explored and rationalized.

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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-20220984 (I-20220984) (I-20220984)
3. DFG project 515937481 - Untersuchung der prozessabhängigen Mikrostruktur und mechanischen Eigenschaften von E-PBF prozessierten Ti-27Nb-6Ta mit geringem Elastizitätsmodul auf Basis vorlegierter Pulver (515937481) (515937481)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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