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

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.
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https://hal-cnrs.archives-ouvertes.fr/hal-02380889
Contributor : Nathalie Gey Connect in order to contact the contributor
Submitted on : Thursday, December 3, 2020 - 3:34:59 PM
Last modification on : Friday, November 19, 2021 - 11:30:09 AM

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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⟩

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