Journal Article

PUBDB-2025-03637

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The synergistic strength-ductility mechanism of the in-situ constructed interfacial/intragranular hierarchical structure in nano particulate reinforced (TiB+La$_2$O$_3$)/Ti composites

Li, S. ; Xiao, S. (Corresponding author)Extern* ; Li, Z. ; Zhu, G. (Corresponding author)Extern* ; Le, J. (Corresponding author) ; Liu, Y. ; Wei, Z. ; Huang, G. ; Hegedüs, Z.DESY* ; Lienert, U.DESY* ; Sui, X. ; Han, Y. (Corresponding author) ; Lu, W. ; Zhang, D.Extern*

2025
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.compositesb.2025.112737  doi:10.3204/PUBDB-2025-03637

Abstract: The strength-ductility trade-off has hindered the widespread application of powder metallurgy (PM) titanium matrix composites (TMCs). In-situ planting nano-particles as ultra-fine networks into the TMCs powder and constructing the interfacial/intragranular hierarchical microstructure have emerged as a promising strategy to overcome the strength-ductility trade-off. In the present work, we precisely controlled the distribution of the network nano-particles by adjusting the sintering temperatures and successfully transformed the ultrafine network into the interfacial/intragranular structure. The well-designed (TiB + La$_2$O$_3$)/IMI834 TMCs demonstrated exceptional mechanical properties, achieving a tensile strength of 1158 MPa while maintaining an elongation exceeding 8.6 %—performance comparable to wrought TMCs without requiring thermo-mechanical processing. The dislocation evolution and the slip activation behavior were investigated by in-situ synchrotron X-ray diffraction experiments and interrupted in-situ SEM-EBSD observations, which provided new insights into the strength-ductility synergy mechanism of the interfacial/intragranular nano-particles. These studies revealed that the hierarchical structure enhanced the dislocation storage capacity while simultaneously promoting <c+a> slip activation. This dual effect facilitated multi-system sliding, which effectively optimized dislocation distribution and reduced stress concentration. This study visually elucidates the synergistic strength-ductility mechanism of the interfacial/intragranular hierarchical structure and establishes a straightforward and reliable approach for manufacturing high-performance PM TMCs.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)
2. Experimentebetreuung PETRA III (FS-PET-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 ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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