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Surface relief effects of α precipitates in a Ti–Mo alloy

✍ Scribed by H. Guo; M. Enomoto

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
319 KB
Volume
50
Category
Article
ISSN
1359-6454

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✦ Synopsis

The characteristics of the formation of surface relief associated with h.c.p. α precipitates in a Ti-Mo alloy were studied by atomic force microscopy coupled with electron back scattering diffraction and three-dimensional morphological observation. Tent-or inverse tent-shaped relief was formed with normal α plates (thick plates formed often with a ragged interface at smaller undercoolings) progressively to a lesser extent with decreasing temperature. It was replaced entirely by invariant plane strain (IPS) type relief as the plate morphology evolved to black plates (thin straight plates formed at larger undercoolings). In contrast to IPS relief the tilt angles of tent-and inverse tent-shaped relief were often considerably greater than expected from the motion of biatomic structural ledges. There seems to be a marked correlation of relief type with the surface orientation of matrix grains. A phenomenological explanation is presented for unduly large relief angles on the basis of previous theories.

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## A~t~ct-M~surements of relief effects confirm that a contraction due to vacancy annihilation accompanies the formation of surface rods. This contraction is shown to account for the systematic dispiaccment of the axes of these rods from their invariant lines. Axial length changes show that the sh