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Tailoring Microstructure and Properties of a Superelastic Ti–Ta Alloy by Incorporating Spark Plasma Sintering with Thermomechanical Processing

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Abstract

A powder metallurgy Ti–35 at.% Ta alloy was produced using a spark plasma sintering process. The sintered alloy exhibited Ta-rich regions at a sintering temperature of 1100 °C. Complete diffusion of elemental powders was achieved via homogenization heat treatment at 1500 °C for 12 h, but the ductility declined drastically. The brittle behavior of the homogenized sample was due to the high-oxygen content, continuous grain boundary α-phase and high-angle grain boundaries. Excellent mechanical properties were achieved when hot forging was used along with preheating the homogenized specimen at 1100 °C. The mechanisms underlying this phenomenon were suppression of the solid grain boundary α-phase, high fraction of low-angle grain boundaries and dynamic recrystallization. Tensile strength improved to the maximum value of 868 MPa. The strain recovery ratio increased to 90% in the first cycle during a cyclic loading–unloading test. Incomplete strain recovery of the first cycle was due to the presence of the martensite phase (α″).

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Acknowledgment

This work was financially supported by Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia, Osaka University of Special Budget Project of the Ministry of Education, Culture, Sports, Science and Technology.

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Authors and Affiliations

  1. JWRI, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan

    Abdollah Bahador, Shota Kariya, Junko Umeda & Katsuyoshi Kondoh

  2. Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia

    Esah Hamzah

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  1. Abdollah Bahador
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Correspondence to Abdollah Bahador.

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Bahador, A., Kariya, S., Umeda, J. et al. Tailoring Microstructure and Properties of a Superelastic Ti–Ta Alloy by Incorporating Spark Plasma Sintering with Thermomechanical Processing. J. of Materi Eng and Perform 28, 3012–3020 (2019). https://doi.org/10.1007/s11665-019-04061-8

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  • DOI: https://doi.org/10.1007/s11665-019-04061-8

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