Criteria for fast and selective α precipitation at β grain boundaries in Ti-alloys Consequence for in-service microstructures - Archive ouverte HAL Access content directly
Conference Papers Year : 2020

Criteria for fast and selective α precipitation at β grain boundaries in Ti-alloys Consequence for in-service microstructures

(1, 2) , (1, 2) , (3, 2) , (3, 2) , (1, 2)
1
2
3

Abstract

The potential for β grain boundaries (GBs) to give rise to large Widmanstätten colonies was determined through the observation of a large amount of precipitates at β GBs in a β-metastable titanium alloy using electron backscatter imaging and diffraction. The most critical boundaries are those which transform early and where a type of Variant Selection (VS) called double Burgers VS occurs. This mechanisms take place at 'special' β boundaries misoriented so that an α precipitate can be related to both grains through the Burgers relation. It was shown that the most critical GBs have a disorientation at an angle of less than 10° from 49.5°/<110> or 60°/<110>. A simulation study allowed those boundaries to be quantifed in crystallographic textures typical of industrial products. Those texture have then been discussed as a function of their potential to form large Widmanstätten colonies.
Fichier principal
Vignette du fichier
matecconf_ti2019_12040_Tao.pdf (962.63 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-02380889 , version 1 (26-11-2019)
hal-02380889 , version 2 (03-12-2020)

Identifiers

Cite

Tao Liu, Lionel Germain, Julien Teixeira, Elisabeth Aeby-Gautier, Nathalie Gey. Criteria for fast and selective α precipitation at β grain boundaries in Ti-alloys Consequence for in-service microstructures. The 14th World Conference on Titanium, Jun 2019, Nantes, France. ⟨10.1051/matecconf/202032112040⟩. ⟨hal-02380889v2⟩
70 View
71 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More