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Materials 2017, 10(9), 1103; doi:10.3390/ma10091103

Superplastic Deformation Mechanisms of Superfine/Nanocrystalline Duplex PM-TiAl-Based Alloy

School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China
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Received: 21 July 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 19 September 2017
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Abstract

In this paper, the equiaxed superfine/nanocrystalline duplex PM-TiAl-based alloy with (γ + α2) microstructure, Ti-45Al-5Nb (at %), has been synthesized by high-energy ball milling and vacuum hot pressing sintering. Superplastic deformation behavior has been investigated at 1000 °C and 1050 °C with strain rates from 5 × 10−5 s−1 to 1 × 10−3 s−1. The effects of deformation on the microstructure and mechanical behaviors of high Nb containing TiAl alloy have been characterized and analyzed. The results showed that, the ultimate tensile strength of the alloy was 58.7 MPa at 1000 °C and 10.5 MPa at 1050 °C with a strain rate of 5 × 10−5 s−1, while the elongation was 121% and 233%, respectively. The alloy exhibited superplastic elongation at 1000 and 1050 °C with an exponent (m) of 0.48 and 0.45. The main softening mechanism was dynamic recrystallization of γ grains; the dislocation slip and γ/γ interface twinning were responsible for superplastic deformation. The orientation relationship of γ/γ interface twinning obeyed the classical one: (001)γ//(110)γ. View Full-Text
Keywords: duplex PM-TiAl alloy; superfine/nanocrystalline; superplastic deformation duplex PM-TiAl alloy; superfine/nanocrystalline; superplastic deformation
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MDPI and ACS Style

Gong, X.; Duan, Z.; Pei, W.; Chen, H. Superplastic Deformation Mechanisms of Superfine/Nanocrystalline Duplex PM-TiAl-Based Alloy. Materials 2017, 10, 1103.

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