Precipitation behavior of orthorhombic phase in ti-22al-25nb alloy during slow cooling aging treatment and its effect on tensile properties

Beibei Wei, Bin Tang, Xiaofei Chen, Qin Xu, Shuaijin Zhang, Hongchao Kou, Jinshan Li

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The precipitation behavior of the orthorhombic (O) phase during the slow cooling aging treatment of Ti-22Al-25Nb (at.%) alloy was investigated by microstructural characterization. Then the effect of O phase precipitation on the tensile properties was studied by room-temperature tensile tests. The results showed that the precipitation of the O phase transformed from both grain boundaries and intragranular to only grain boundaries with the temperature increasing. The nucleation mechanism of the O phase from intergranular is composed of sympathetic nucleation and interface instability nucleation. In addition, the results of tensile tests indicated that the ultimate tensile strength of the alloy decreases as the precipitation of the O phase increases. Meanwhile, from the tensile results, it is concluded that the optimum heat treatment process is slow cooling after aging at 950C for 1 h.

Original languageEnglish
Article number1515
Pages (from-to)1-11
Number of pages11
JournalMetals
Volume10
Issue number11
DOIs
StatePublished - Nov 2020

Keywords

  • Heat treatment
  • Orthorhombic phase
  • Tensile properties
  • Ti-22Al-25Nb alloy

Fingerprint

Dive into the research topics of 'Precipitation behavior of orthorhombic phase in ti-22al-25nb alloy during slow cooling aging treatment and its effect on tensile properties'. Together they form a unique fingerprint.

Cite this