Journal Article

PUBDB-2026-00542

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Enhancing ductility of laser powder bed fusion Ti-6Al-4V alloys by molybdenum addition: A study on microstructure and deformation mechanisms

Guo, Y.Extern* ; Liu, Y. ; Song, Z. ; Ye, J. (Corresponding author)Extern* ; Zhu, G.DESY* ; Zeng, X. ; Wang, L. (Corresponding author)Extern*

2025
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.addma.2025.104998

Abstract: The limited ductility of laser powder bed fusion (LPBF) Ti-6Al-4V (Ti64) alloys, caused by their brittle α'-martensitic microstructure, significantly restricts their broader application. This study systematically investigates the influence of Mo additions (0, 1, 3, and 5 wt%) on the microstructure evolution, deformation mechanisms, and mechanical properties of LPBF Ti64 alloys. Incorporation of Mo notably transforms the phase composition from purely α'-martensitic (Ti64 and Ti64–1Mo) to a multi-phase structure containing metastable β and α" phases alongside α' (Ti64–3Mo and Ti64–5Mo). Ti64–3Mo exhibits an optimal balance of mechanical properties, achieving significant improvements in uniform elongation (9.5 %) and maintaining high yield strength (955 MPa). Enhanced ductility in Ti64–3Mo and Ti64–5Mo is attributed to the synergistic activation of multiple deformation mechanisms, including stress-induced martensite transformation in metastable β, and twinning coupled with multiple slip modes in the α' phase. However, early activation of twinning prior to basal slip reduces yield strength. These insights underscore the crucial role of Mo as a compositional modifier, providing a practical approach for engineering strength-ductility combinations in additively manufactured titanium alloys.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P21.2 (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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