Self-accommodation of crystals of martensitic phases in titanium and zirconium based alloys.

Autor: Khundzhua, A., Ptitsyn, A., Brovkina, E., Chzhen, S.
Zdroj: Physics of Metals & Metallography; Nov2012, Vol. 113 Issue 11, p1035-1040, 6p
Abstrakt: The orientation relationships between austenite and α′ and α″ martensite lattices in titanium and zirconium alloys is performed in view of the possibility of the formation of self-accommodating complexes, which is an important component of the shape memory effect. Different diffraction patterns calculated for various matrices of the orientation relationship were compared with the experimental patterns for TiZrNb alloy using a formula developed for the optimal expression of the orientation relationship for α″. The generalization and analysis of the literature data for titanium- and zirconium-based solid solutions performed using the developed algorithm lead us to conclusions regarding the tendency of α′ martensite in titanium-based solid solutions to self-accommodate, which occurred more strongly than that in zirconium-based alloys, and the best results in shape memory realization should be expected in Ti-Ta and Ti-Nb systems. Possible reasons for the absence of the shape memory effect for α′ martensite in titanium- and zirconium-based alloys, with regard to the necessary crystallographic conditions for the formation of self-accommodating processes are analyzed. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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