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Journal of Materials Engineering and Performance

, Volume 28, Issue 2, pp 973–980 | Cite as

Hot Deformation Mechanisms of Ti22Al25Nb Orthorhombic Alloy

  • Jingli ZhangEmail author
  • Jingping Wu
  • Yuanyuan Luo
  • Xiaonan Mao
  • Dizi Guo
  • Shengze Zhao
  • Fan Yang
Article
  • 18 Downloads

Abstract

In this paper, the hot deformation behavior of Ti22Al25Nb was investigated by hot compression over a range of temperatures (950-1050 °C) and strain rates (0.001-1 s−1). Considering the adiabatic heating and friction, the original curves were corrected. The friction-corrected data were lower than the measured flow stress data. The flow stress data increased after the temperature correction owing to the elimination of the softening effect. In addition, the work hardening effects on the hot deformation of the normal and multi-peak flow stress curves were compared. A critical dislocation density was proposed to analyze the multi-peak phenomenon. When the dislocation density decreased to a critical value, the work hardening and dynamic recrystallization mechanisms reached a balance. Then, a new work hardening mechanism became dominant, and the flow stress increased. The effect of second-phase particles on the hot deformation mechanisms was investigated. The result showed that second-phase particles led to a high nucleation rate and a low growth rate of new recrystallization grains during the rapid hot deformation.

Keywords

deformation mechanism dislocation density second phase Ti-Al-Nb alloy work hardening 

Notes

Acknowledgments

The work was supported by the National Natural Science Foundation of China (Grant No. 51805442) and the Scientific and Technological Innovation Project of Shaanxi Province of China (Grant No. 2016KTCQ01-103).

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.Northwest Institute for Nonferrous Metal ResearchXi’anChina

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