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RETRACTED ARTICLE: Ultra-High Strength and Ductile Lamellar-Structured Powder Metallurgy Binary Ti-Ta Alloys

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This article was retracted on 15 May 2018

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Abstract

Ultra-high strength and ductile powder metallurgy (PM) binary Ti-20at.%Ta alloy has been fabricated via sintering from elemental Ti and Ta powders and subsequent hot swaging and annealing. The microstructural evolution and mechanical properties in each stage were evaluated. Results show that inhomogeneous microstructures with Ti-rich and Ta-rich areas formed in the as-sintered Ti-Ta alloys due to limited diffusion of Ta. In addition, Kirkendall porosity was observed as a result of the insufficient diffusion of Ta. Annealing at 1000°C for up to 24 h failed to eliminate the pores. Hot swaging eliminated the residual sintering porosity and created a lamellar microstructure, consisting of aligned Ta-enriched and Ti-enriched phases. The hot-swaged and annealed PM Ti-20Ta alloy achieved an ultimate tensile strength of 1600 MPa and tensile elongation of more than 25%, due to its unique lamellar microstructure including the high toughness of Ta-enriched phases, the formation of α phase in the β matrix and the refined lamellae.

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  • 15 May 2018

    The editors and authors have retracted the article, “Ultra-High Strength and Ductile Lamellar-Structured Powder Metallurgy Binary Ti-Ta Alloys” by Yong Liu, Shenghang Xu, Xin Wang, Kaiyang Li, Bin Liu, Hong Wu, and Huiping Tang (https://doi.org/10.1007/s11837-015-1801-1).

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Acknowledgements

The authors gratefully acknowledge the financial support from the National High Technology Research and Development Program of China (863 Program) (No. 2013AA031103), Shenzhen Municipal Science and Technology Plan (CXY201107010187A), and the Project of Innovation-driven Plan in Central South University (2015CX004).

Author information

Authors and Affiliations

  1. The State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Yong Liu, Shenghang Xu, Xin Wang, Kaiyang Li, Bin Liu & Hong Wu

  2. The State Key Laboratory of Porous Metals, Northwestern Institute of Nonferrous Metals, Xi’an, 710012, Shanxi, People’s Republic of China

    Huiping Tang

Authors
  1. Yong Liu
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  2. Shenghang Xu
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  3. Xin Wang
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  4. Kaiyang Li
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  5. Bin Liu
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  6. Hong Wu
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  7. Huiping Tang
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Corresponding author

Correspondence to Yong Liu.

Additional information

The editors and authors have retracted this article. Following publication, the authors found that the data reported in Figure 11 is incorrect due to a hidden problem with their testing instrument. As a result of the error, a significant portion of the published article is incorrect. All authors agree to this retraction

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Liu, Y., Xu, S., Wang, X. et al. RETRACTED ARTICLE: Ultra-High Strength and Ductile Lamellar-Structured Powder Metallurgy Binary Ti-Ta Alloys. JOM 68, 899–907 (2016). https://doi.org/10.1007/s11837-015-1801-1

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  • DOI: https://doi.org/10.1007/s11837-015-1801-1

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