Abstract
The crystalline-to-amorphous (c-a) phase transformation in the intermetallic compound Zr 3Al during room temperature bombardment with 1.0 MeV Kr + was investigated. Transmission electron microscopy and Brillouin scattering techniques were used to determine the lattice parameter and shear elastic constant as a function of the degree of long-range order. The results show that a large (about 50%) elastic softening and dilatation strain (about 3%) due to disordering precede the onset of amorphization. These results indicate that chemical disordering is an important driving force for the c-a transformation and that the mechanism is an elastic shear instability. It is also shown that the volume dependence of the shear elastic constant associated with radiation-induced disordering and eventual amorphization is virtually identical to that associated with the heating to melting of many solids. The origin and implications of this parallelism between solid state amorphization and melting are discussed.
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