4.7 Article

Influences of boron contents on microstructures and mechanical properties of as-casted near α titanium alloy

Journal

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 77, Issue -, Pages 1-18

Publisher

JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.11.010

Keywords

Boron element; Mechanical properties; Microstructures; Fracture behaviors; Near alpha titanium alloy; Textures

Funding

  1. Industrial Strengthen Foundation Project of Ministry of Industry and Information Technology, PRC [TC150B5C0-02]

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The influences of boron element and its amounts on phase constitutions, microstructures, textures and compression mechanical properties of Ti-6.5Al-2.5Sn-9Zr-0.5Mo-0.25Si-1Nb-1W-0.1Er-xB (x = 0, 0.1, 0.2, 0.4, 0.6 and 0.8 wt%) have been carefully studied. It is found that 0.2 wt% boron content is the most appropriate amount for microstructural refinement and mechanical properties enhancement while ensuring plasticity in current near alpha titanium alloys.
Ti-6.5Al-2.5Sn-9Zr-0.5Mo-0.25Si-1Nb-1W-0.1Er-xB (x = 0, 0.1, 0.2, 0.4, 0.6 and 0.8 wt%) with different boron contents are fabricated for investigation. Influences of boron element and its amounts on phase constitutions, microstructures, textures and compression mechanical properties are carefully studied. With the increasing boron additions, contents of TiB phase increase, and the maximum intensities of textures decrease. Microstructures are significantly and continuously refined after adding boron element and with the increasing boron additions, and turning point of refinement rates for different microstructural parameters is found at 0.2 wt% boron content. Strengths increase monotonously, while elongations increase firstly and decrease afterwards. The maximum value of elongation is acquired at boron content of 0.2 wt%. On the premise of ensuring plasticity, 0.2 wt% boron content is the most appropriate amount for microstructural refinement and mechanical properties enhancement for current near alpha titanium alloys. Meanwhile, aspect ratios of TiB whiskers increase with the increasing boron contents. Lots of near equiaxed alpha grains or alpha grains with irregular morphologies are discovered around TiB phase. Distorted and twisted alpha grain boundaries are also obviously detected in boron containing alloys. Moreover, premature fracture of alloys containing TiB whiskers is largely influenced by the fracture of these brittle reinforcements. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

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