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

Abstract:

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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.

Info:

Periodical:

Materials Science Forum (Volumes 495-497)

Edited by:

Paul Van Houtte and Leo Kestens

Pages:

663-668

DOI:

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

Citation:

L. Germain et al., "β→αs Variant Selection in Sharp hcp Textured Regions of a Bimodal IMI834 Billet ", Materials Science Forum, Vols. 495-497, pp. 663-668, 2005

Online since:

September 2005

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Price:

$35.00

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