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Effect of Boron Addition Methods on Microstructure and Mechanical Properties of a Near-α Titanium Alloy

  • Yingying Liu
  • Lihua ChaiEmail author
  • Xiaozhao Ma
  • Yapeng Cui
  • Ziyong Chen
  • Zhilei Xiang
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 217)

Abstract

This work investigated the effect of boron addition methods on microstructure and mechanical properties of a near-α titanium alloy. Ti–6.5Al–2.5Sn–9Zr–0.5Mo–1W–1Nb–0.25Si was used as the matrix, and 0.3 wt% TiB2 and 0.1 wt% B were added, respectively. The results show that the addition of trace boron forms TiB whiskers on the prior β grain boundaries and leads to significant refinement of the microstructure in the based alloy. And, the refining effect of the 0.3 wt% TiB2 and 0.1 wt% B on the base alloy is similar. At room temperature, the strength of the boron-containing alloys has a certain increase, but the elongation drops slightly. Through study on the microstructure of tensile strained specimens, it was found that the increase of tensile strength of the boron-containing alloys is the combination of the base microstructure and the whisker bearing, while the ductility drops significantly is mainly attributed to the cracking of TiB phase.

Keywords

Titanium alloys TiB whiskers Microstructure Mechanical properties 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Yingying Liu
    • 1
  • Lihua Chai
    • 1
    Email author
  • Xiaozhao Ma
    • 1
  • Yapeng Cui
    • 1
  • Ziyong Chen
    • 1
  • Zhilei Xiang
    • 1
  1. 1.College of Materials Science and EngineeringBeijing University of TechnologyBeijingChina

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