β→αs Variant Selection in Sharp hcp Textured Regions of a Bimodal IMI834 Billet

Lionel Germain; Nathalie Gey; Michel Humbert; Philippe Bocher; Mohammad Jahazi

doi:10.4028/www.scientific.net/MSF.495-497.663

Paper Titles

Characteristics of Hot Compressed Magnesium Alloy AZ31 with Initial Textures Analyzed by Orientation Mapping
p.639

Texture, Tensile Properties and Press Formability of Mg-3Al-1Zn/Ti Clad Sheets Produced by Roll-Bonding
p.645

Role of Deformation Twinning in Cold Rolling and Recrystallization of Titanium
p.651

Anisotropic Tensile Properties at Room and Elevated Temperatures in Warm-Extruded AZ61 Magnesium Alloy
p.657

β→α_s Variant Selection in Sharp hcp Textured Regions of a Bimodal IMI834 Billet
p.663

The Martensitic Transformation Texture in Ti-6Al-4V
p.669

Evolution of Texture in Zirconium Alloy Tubing during Processing
p.675

Phase Transformation Textures in Ti-6Al-4V Alloy
p.681

Bulk Texture and Structure Changes in Tubes of Zr Alloys due to the Long-Range Effect of Ion-Plasma Surface Treatment
p.687

HomeMaterials Science ForumMaterials Science Forum Vols. 495-497β→αs Variant Selection in Sharp hcp Textured...

β→α_s Variant Selection in Sharp hcp Textured Regions of a Bimodal IMI834 Billet

Abstract:

Regions with sharp local textures, called macrozones, have been characterised in a bimodal IMI834 billet, containing 30% of primary αp grains surrounded by secondary αs colonies. It is shown that the αs colonies have been inherited according to a strong variant selection during the β→αs phase transformation. In each observed macrozone, the favoured variants have in average their c-axes in the same macroscopic direction as the αp grains. A detailed analysis of neighbouring αp grains and αs variants clearly shows that the variants favoured at β/αp boundaries are those able to share their c-axes with a neighbouring αp grain. The sharpness of such a variant selection mechanism is strongly related to the local orientation distribution of neighbouring αp/β grains at high temperature. This explains the differences in variant selection sharpness observed from one macrozone to the other.