Tensile property enhancement by oxygen solutes in selectively laser melted titanium materials fabricated from pre-mixed pure Ti and TiO2 powder

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:795

Article

Kondoh, Katsuyoshi¹  Ichikawa, Eri²  Issariyapat, Ammarueda²  Shitara, Kazuki¹  Umeda, Junko¹  Chen, Biao³  Li, Shufeng⁴ 

[1] Osaka Univ, Joining & Welding Res Inst, 11-1 Mihogaoka, Osaka 5670047, Japan

[2] Osaka Univ, Grad Sch Engn, 1 Yamadaoka, Suita, Osaka 5650871, Japan

[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[4] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China

关键词: Additive manufacturing;    Titanium;    Rapid solidification;    X-ray diffraction;    Interstitial lattice defect;   

DOI  :  10.1016/j.msea.2020.139983

来源: Elsevier

【 摘 要 】

Ti-based materials with high oxygen solute contents were fabricated from mixtures of Ti powder and TiO2 particles by selective laser melting (SLM). Uniformly dissolved oxygen (O) from the TiO2 particles caused c lattice expansion in alpha-Ti crystals, which effectively increased the strengths of as-built SLM Ti-O materials. The as-built SLM Ti-O material using 1.5 wt% TiO2 showed a yield stress of 962 MPa and 15.3% elongation. The yield stress increases calculated by the Hall-Petch equation and Labusch model were equivalent to those observed experimentally, and O solid-solution strengthening was dominant in increasing yield stress.

【 授权许可】

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