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Mechanical Instabilities in the B.c.c. Lattice and the Beta to Omega Phase Transformation by D. De Fontaine is a Engineering article available to read on EtoBox.

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The beta to omega phase transformation in certain titanium and zirconium alloys can be accomplished formally by subjecting the b.c.o. lattice to a transverse sinusoidal displacement wave of wave vector #(112), crystallographically equivalent to a &(lll) longitudinal wave. The instability of this particular mode corresponds to negative eigenvalues of the dynamical matrix of the "average" b.c.c. crystal in the vicinity of the point +(112) in the first Brillouin zone. By mapping out the regions of negative eigenvalues, one can reproduce the essential features of electron diffraction patterns obtained from asquenched Zr-Ti alloys. The positions and shapes of the o reflections and the corresponding diffuse intensity are predicted correctly. INSTABILITES MECANIQUES DANS LE RESEAU C.C.C. ET LA TRANSFORMATION DE PHASE BETA A OMEGA Pour certains alliages de titane et de zirconium, la transformation de phase beta a omega peut btre obtenue correctement en soumettant le reseau C.C.C. it une onde de deplacement sinusoidale transversale, de vecteur d'onde +(112), cristallographiquement Bquivalente a une onde longitudinale #(ill). L'instabilite de ce mode particulier correspond a des valeurs prop

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Author

D. De Fontaine

Publisher

Elsevier Science; Elsevier ; University of Toronto Press; Elsevier BV (ISSN 0001-6160)

Published

1970

Language

EN

Field

Engineering (Physical Sciences)