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Sintering Response and Equiaxed α-Ti Grain Formation in the Ti Alloys Sintered from Ti@Ni Core–Shell Powders

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Abstract

Using Ti@Ni core–shell powder is in favor of enhancing the sintering densification, obtaining the linear shrinkage response, forming equiaxed α-Ti grain, and reducing the oxygen contamination, compared to the elemental powder mixtures. The enhanced sintering densification is responsible for the improved tensile strength, while a combination of the equiaxed α-Ti grain formation, the low oxygen increment, and the reduced porosity content noticeably doubled the tensile ductility. The linear shrinkage response is good for accurately controlling the dimension of the sintered parts. All of the improved issues are largely attributed to the unique dissolution phenomenon of Ni from Ti@Ni core–shell powder. The detailed mechanism will be discussed in this paper.

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Acknowledgments

The work was supported by the Key Research Program of Frontier Sciences (Grant No. QYZDB-SSW-JSC045), Chinese Academy of Sciences, and National Youth Thousand Plan Program. This work was also financially supported by the National Natural Science Foundation of China (51602313).

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Author notes

  1. C. Tan and S.F. Li were contributed equally to this work and should be considered co-first author.

Authors and Affiliations

  1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, CAS, No. 1 Zhongguancun North 2nd Street, Beijing, 100190, China

    C. Tan, S. F. Li, Y. F. Yang, Q. S. Zhu, C. Q. Hu & P. P. Lv

  2. School of Power Engineering, China University of Petroleum, 18 Fuxue Road, Beijing, 102249, China

    C. Tan

  3. University of Chinese Academy of Sciences, No. 19 (A) Yuquan Road, Beijing, 100049, China

    Y. F. Yang, Q. S. Zhu & C. Q. Hu

  4. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Lanzhou, 730050, China

    Y. Shi

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  1. C. Tan
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Corresponding author

Correspondence to Y. F. Yang.

Additional information

Manuscript submitted March 22, 2018.

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Tan, C., Li, S.F., Yang, Y.F. et al. Sintering Response and Equiaxed α-Ti Grain Formation in the Ti Alloys Sintered from Ti@Ni Core–Shell Powders. Metall Mater Trans A 49, 3394–3401 (2018). https://doi.org/10.1007/s11661-018-4698-9

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  • DOI: https://doi.org/10.1007/s11661-018-4698-9

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