The cubic-hexagonal transformation in single crystals of cobalt and cobalt-nickel alloys

Abstract

Kinetic and crystallographic observations on the natural and stress-induced transformations in single crystals of cobalt and cobalt-nickel alloys have confirmed the martensitic nature of the change. The shape deformation has been measured for the stress-induced transformation in alloys; the habit plane is not determined by a maximum resolved shear stress condition. The accommodation stresses produced by transformation have very marked effects, and thermal cycling eventually leads to stability of the cubic form down to liquid—air temperatures.