journal article·2026-07Open access

Sustainable upcycling of coarse TA15 powder waste into high-performance TiB-whisker-reinforced composite powders

Jianqiang Ren, Zhifu Yao, Pengtao Cai, Yifan Wang, Shuai Wang, Qi An, Rui Zhang, Changshu Xiang, Lujun Huang, Lin Geng

Abstract

Addressing the pressing issue of coarse TA15 titanium powder waste (> 150 μm) accumulation in additive manufacturing, this study introduces a high-value upcycling strategy using the plasma rotating electrode process (PREP) to fabricate TiB/TA15 pre-alloyed composite powders. A quantitative cooling model reveals the cooling rate increases from 5.39×10 4 to 5.13×10 6 K/s as particle size decreases. This rapid cooling, combined with the pinning effect of in-situ TiB whiskers, induces pronounced microstructural changes: α' martensitic laths are refined from 1.162 μm to 0.528 μm, and TiB reinforcements transform from a continuous network to a dispersed distribution. The TiB whiskers within the composite powders are characterized by a high density of intrinsic stacking faults and retain clean, well-bonded interfaces with the matrix. This reinforcement phase not only enhances the intrinsic strength of the composite powders but also effectively inhibits matrix prior-β grain coarsening. This work provides a cost-effective and scalable pathway for converting titanium waste into high-quality feedstock for advanced composite manufacturing.
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Research context

OpenAlex topics: Advanced ceramic materials synthesis · Molten salt chemistry and electrochemical processes · Advanced materials and composites

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