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Effect of Sintering Environment on Microstructures and Mechanical Properties of Metal Injection Molding Ti-6Al-4V Alloys

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Abstract

We employed a water-soluble binder to form Ti-6Al-4V alloy through metal injection molding and studied the effects of sintering (under Ar and various vacuum conditions) on the microstructure and mechanical properties of the material. The density was measured using the displacement method. The microstructure and mechanical properties of the alloy were characterized using optical microscopy, scanning electron microscopy, electron probe microanalysis, transmission electron microscopy and a universal testing machine. The results indicate that sintering the Ti-6Al-4V alloy under vacuum improved relative density and mechanical properties more than under the Ar environment. Furthermore, high-vacuum sintering significantly enhanced the relative density and mechanical properties of the material. At < 10−3 Pa vacuum pressure, the material exhibited optimal relative density (97.6%), tensile strength (1022.7 MPa) and elongation (6.4%). Also, the impurity contents were 0.071%, 0.25% and 0.012% for carbon, oxygen and nitrogen, respectively, which met the impurity content requirements of Ti-6Al-4V alloy.

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Acknowledgements

The authors gratefully acknowledge the support of Key Research and Development Project of Yunnan Province and International Science and Technology Cooperation Project (202103AF140004), Technology Talent and Platform Plan (202305AQ350001) and Key Research and Development Project of Yunnan Province (202203AM140010). This work is supported by the National and Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology, and Joint Laboratory for Key Technologies of Titanium Forming, Kunming University of Science and Technology, Kunming, China.

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Authors and Affiliations

  1. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    Chuanyong Li, Lu Li, Weichen Zhang & Xiuhu Guo

  2. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    Lu Li

  3. City College, Kunming University of Science and Technology, Kunming, 650051, People’s Republic of China

    Zhentao Yuan & Xiao Wang

  4. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Gang Chen

  5. Faculty of Engineering, Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand

    Peng Cao

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  1. Chuanyong Li
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Correspondence to Lu Li.

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Li, C., Li, L., Zhang, W. et al. Effect of Sintering Environment on Microstructures and Mechanical Properties of Metal Injection Molding Ti-6Al-4V Alloys. JOM 76, 2053–2061 (2024). https://doi.org/10.1007/s11837-024-06395-8

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