Effect of aging temperature on microstructure and mechanical properties of a novel Ti-6121 alloy

Jianwei Chen, Le Wang*, Qunbo Fan, Zhuoyue Sang, Yao Xu, Changhao Wang, Jiahao Yao, Zhiming Zhou, Liu Yang, Zheng Liu, Jinliang Gao, Heyong Feng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The effect of heat treatment on the microstructure and mechanical properties of a novel α + β Ti-6.2Al-0.8V-2.25Mo-1.2Cr-0.5Si (wt%) alloy was investigated in this paper. Microstructure and crystalline structure of the alloys after different solution and aging treatments were identified by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results indicated that a multi-scale microstructure was possessed in the heat-treated samples, which was composed of equiaxed primary α (αp) phase and nano-scale acicular secondary α (αs). After 900 ℃ solution for 1 h and 550 ℃ aging for 6 h, the alloy exhibited the optimal combination of strength and ductility (the ultimate tensile strength of ∼1387 MPa, the elongation of ∼11 %). Furthermore, the combination mechanism of strength-ductility of the sample under this condition was investigated. The samples before and after tensile fracture were analyzed using transmission electron microscope (TEM) and electron back-scattered diffraction (EBSD). The results showed that a large proportion of nano-scale acicular αs phases precipitated from the β matrix can effectively prevent the slip of dislocations and enhance the strength of the alloy. In addition, the multi-scale microstructure can create the strain partition, which can mediate the strain incompatibility between the αp and the transformed β (βT) to obtain an excellent combination of strength and ductility.

Original languageEnglish
Article number169612
JournalJournal of Alloys and Compounds
Volume947
DOIs
Publication statusPublished - 25 Jun 2023

Keywords

  • Heat treatment
  • Microstructure evolution
  • Multi-scale microstructure
  • Strength-ductility combination
  • Tensile properties

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Chen, J., Wang, L., Fan, Q., Sang, Z., Xu, Y., Wang, C., Yao, J., Zhou, Z., Yang, L., Liu, Z., Gao, J., & Feng, H. (2023). Effect of aging temperature on microstructure and mechanical properties of a novel Ti-6121 alloy. Journal of Alloys and Compounds, 947, Article 169612. https://doi.org/10.1016/j.jallcom.2023.169612