Ti-20Al-22Nb合金的凝固组织转变及力学行为

Translated title of the contribution: Transformation of Solidified Structure and Mechanical Behavior of Ti-20Al-22Nb Alloy

Langping Zhu, Xin Lu, Yaqing Hou, Hai Nan, Xuanhui Qu

Research output: Contribution to journalArticlepeer-review

Abstract

Ti-20Al-22Nb (at%) alloys were prepared by investment casting. The microstructures and tensile properties at room temperature of as-cast, hot isostatic pressed and annealed alloys were analyzed. The results show that solidified alloy consists of β matrix, fine acicular α2 phase and a small amount of O phase. The as-cast alloy has course widmanstatten structure. Besides, the phase transformation inside original β/B2 grain is incomplete owing to non-equilibrium solidification. Loose defect and inhomogeneity of microstructures cause low plasticity of the material. The loose defects are eliminated by hot isostatic pressing in the two-phase region of α2+β/B2, acicular α2 phase precipitates fully in the original grains, the microstructure homogeneity improves, and the elongation of the alloy increases from 2% to 5%. After annealing treatment in the α2+/B2+O three-phase region, the supersaturated β phase transforms to the equilibrium state. Through the peritectoid transformation of β/B2+α2→O, ring-shaped O phase forms around needle-shaped α2 phase, and the elongation further increases to 11%.

Translated title of the contributionTransformation of Solidified Structure and Mechanical Behavior of Ti-20Al-22Nb Alloy
Original languageChinese (Traditional)
Pages (from-to)3460-3464
Number of pages5
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume49
Issue number10
Publication statusPublished - 2020 Oct
Externally publishedYes

Keywords

  • Cast
  • Heat treatment
  • Microstructure
  • Tensile property
  • TiAl

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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