X-Ray Small-Angle Scattering Study on the Decomposition Process of Cu-4wt% Ti Alloy

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Abstract

The decomposition process of Cu-4wt% Ti alloy during aging at low temperatures, 200–260°C, and at higher temperatures, 300–450°C, has been investigated by means of X-ray small-angle scattering technique.<BR>At the initial stages of aging at the low temperatures, spinodal decomposition takes place and gives the sinusoidal composition modulations in the solid solution. The rate of amplification of composition waves is well in accord with the kinetics of spinodal decomposition. At the later stages of the aging, the sinusoidal composition wave transforms into a step-like one with a well-defined interface between the matrix and the solute-rich regions. The critical temperature, below which the alloy is allowed to decompose spinodally, is estimated to be about 350°C.<BR>At higher temperatures, 300–450°C, the zone-complex are formed during aging for 1 min and thereafter the aggregation of the zone-complex is a main process at 300–400°C. At 450°C, the amount of the inner-zone of the zone-complex still increases during further aging, and the solute concentration in the matrix is decreased. It is found that X-ray side-bands obtained from the alloy aged in the high temperature range are not directly associated with the spinodal decomposition of this alloy.

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