In the case of Ti-alloys, it is confirmed that α stabilizer increases the c/a ratio. What is the mechanism of correlation of the c/a ratio with the unit cell? It is true if increases c/a ratio in HCP structure will linearly decrease unit-cell? or vice versa? What is the mechanism to connect these phenomena?
I think that is a result of lattice distortion. Alpha stabilizing elements are either interstitial (e.g. oxygen) or substitutional (e.g. Al). The former occupy vacancies which may slightly increase c, while the atomic radii of the latter are normally smaller than that of Ti which can reduce a, both resulting in a slight increase in c/a ratio.
Dear Dr. Ahmad Zafari
Thanks sir.
So, with increasing slightly c/a ratio , is that any correlation mechanism with changing unit cell volume, i.e slightly decrease, increase?
Hasfi F. Nurly,
One can measure volume of a unit cell using unit cell parameters. So, yes if c and a are changed the volume can be changed too, but not significantly.
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