Effect of Secondary Annealing Duration on Microstructure and Hardness of TNM Alloy

Limei Cha*, Zongzong Sun, Yong Zhang, Xin Lin, Yu Zhang, Xinqi Zhao, Jing Hao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study focused on the inner correlation between heat treatment, microstructure and mechanical property of TNM (Ti-Al-Nb-Mo) alloy. The samples were firstly annealed at 1 270℃, then kept at 800℃ for 500, 1 000 and 2 000 hours, separately. Using X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and microhardness tester, the phases, microstructures and hardness of the samples bared by varied heat treatments were investigated. It was found that the boundaries of(α2+γ) colonies were boarding when the annealing duration increased;more βo and γ particles precipitated at colony boundaries and formed a cellular structure. At the same time, more nano-scaled βo particles were showed up in the single α2 lamellae, inducing α2o2 structure and more interfaces. Therefore, the hardness of TNM alloy can be enhanced with the prolonging of annealing duration due to the bigger hardness of βo particles and α2o interface which can hind dislocation movements additionally.

Translated title of the contributionEffect of Secondary Annealing Duration on Microstructure and Hardness of TNM Alloy
Original languageChinese (Simplified)
Pages (from-to)18-23
Number of pages6
JournalHunan Daxue Xuebao/Journal of Hunan University Natural Sciences
Volume46
Issue number6
DOIs
StatePublished - 25 Jun 2019

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