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Microstructures, Mechanical Properties, and Shape Memory Characteristics of Powder Metallurgy Ti51Ni49 Modified with Boron

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Abstract

Ti51Ni49 compacts consolidated with persistent liquid-phase sintering usually contain Ti2Ni networks at the grain boundaries, which cause adverse effects on mechanical properties. With 0.5 and 1.0 at pct B additions, fine TiB forms during heating and sintering and acts as a nucleation site for Ti2Ni to precipitate within the grain during cooling. The resultant uniform distribution of TiB and Ti2Ni impedes grain growth and prevents the formation of continuous Ti2Ni precipitates at grain boundaries. As a result, a significant increase in tensile elongation, and not a decrease, as in most as-cast titanium alloys, is obtained because of these changes. The tensile strength also increases, without deterioration of the shape memory characteristics. The tensile strength and elongation are close to those of wrought TiNi alloys.

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Acknowledgments

The authors wish to thank the National Science Council of the Republic of China for their financial support of this work under contract NSC97-2221-E002-033-MY3. We also thank Professor Shyi-Kaan Wu for providing the DSC instrument and tensile test machine, and Chung-Yuan Kao and Yuan-Tzu Lee for their assistance in EPMA analysis.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan, R.O.C.

    Fu-Cheng Yen (Graduate Student) & Kuen-Shyang Hwang (Professor)

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  1. Fu-Cheng Yen
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  2. Kuen-Shyang Hwang
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Correspondence to Kuen-Shyang Hwang.

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Manuscript submitted January 13, 2011.

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Yen, FC., Hwang, KS. Microstructures, Mechanical Properties, and Shape Memory Characteristics of Powder Metallurgy Ti51Ni49 Modified with Boron. Metall Mater Trans A 43, 687–696 (2012). https://doi.org/10.1007/s11661-011-0894-6

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