Enhancing strength and ductility in Ti64 Alloys: Optimizing dual-phase heterostructures and TRIP effects via high-entropy alloy content modulation

Enhancing strength and ductility in Ti64 Alloys: Optimizing dual-phase heterostructures and TRIP effects via high-entropy alloy content modulation

The mechanical performance of Ti-6Al-4 V (Ti64) alloys fabricated via Laser Powder Bed Fusion (L-PBF) can be significantly influenced by the addition of high-entropy alloy (HEA) particles. This study investigates the impact of varying HEA content on the microstructure and mechanical properties of Ti...

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Bibliographic Details
Main Authors: Yifeng Xiong, Yuhang Hu, Faming Zhang, Qifa Wan, Yan Chen, Weihao Yuan, Shuo Yin, Caiyun Shang
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Materials & Design
Subjects:
Laser beam powder bed fusion
Titanium alloys
Heterogeneous microstructures
Transformation-Induced Plasticity
Bimodal Structure
Online Access:http://www.sciencedirect.com/science/article/pii/S0264127525008196
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Summary:The mechanical performance of Ti-6Al-4 V (Ti64) alloys fabricated via Laser Powder Bed Fusion (L-PBF) can be significantly influenced by the addition of high-entropy alloy (HEA) particles. This study investigates the impact of varying HEA content on the microstructure and mechanical properties of Ti64 alloys. By systematically optimizing the HEA content, a lamellar dual-phase microstructure is achieved. The interplay between the refined α’ martensitic phase and the metastable β phase promotes a progressive transformation-induced plasticity (TRIP) effect, enabling superior strain hardening and stress redistribution. The Ti64-(3.0 wt%) HEA alloy achieves an ultimate tensile strength of 1438.1 MPa and elongation of 9.0 %, representing an optimal balance of strength and ductility.
ISSN:0264-1275

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