Formation of bands of ultrafine beryllium particles during rapid solidification of AlBe alloys: Modeling and direct observations

Rapid solidification of dilute hyper-eutectic and monotectic alloys sometimes produces a dispersion of ultrafine randomly-oriented particles that lie in arrays parallel to the advancing solidification front. We characterize this effect in AlBe where Be-rich particles with diameters on the order of 10 nm form in arrays spaced approximately 25 nm apart, and we present a model of macroscopically steady state but microscopically oscillatory motion …