Can I read Variant selection during nucleation and growth of γ-massive phase in TiAl-based intermetallic alloys on EtoBox?

Variant selection during nucleation and growth of γ-massive phase in TiAl-based intermetallic alloys by A. Sankaran; E. Bouzy; M. Humbert; A. Hazotte is a Engineering article available to read on EtoBox.

What is Variant selection during nucleation and growth of γ-massive phase in TiAl-based intermetallic alloys about?

This work deals with the mechanisms of nucleation and growth of c-massive phase in TiAl-based intermetallic alloys. In particular, it focuses on the process of variant selection operating at both stages of the transformation. Small c-massive domains produced by rapid cooling are extensively characterized by high-resolution electron backscatter diffraction. This large data set allows a statistical analysis of nucleation sites, according to different crystallographic configurations. It is established that, whatever the nucleation sites, i.e., grain boundaries or triple junctions, a coherent facet is always found presenting a Blackburn orientation relationship (BOR) between the c nucleus and the a parent grain. Moreover, some c nuclei can additionally present another semicoherent facet with an approximate BOR with the a host grain. A new nucleation mechanism, called ''co-nucleation", is highlighted for this type of double-faceted nucleus. Variant selection during nucleation is discussed for both types of nuclei, in terms of minimization of interface energy. In addition, it is shown that growth of c-massive domains from their initial nucleus always involves successive {1 1 1} twinning.

Who reads Variant selection during nucleation and growth of γ-massive phase in TiAl-based intermetallic alloys?

Author

A. Sankaran; E. Bouzy; M. Humbert; A. Hazotte

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1359-6454)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)