title: Log-normal diameter distribution of Pd-based metallic glass droplet and wire.
abstract: We have studied the formation of Pd42.5Cu30Ni7.5P20 metallic glass droplets and wires in the gas atomization process. We demonstrate that the sizes of droplets and wires can be distinguished by the Ohnesorge number (Oh), which is the proportion of the spinnability to the capillary instability, and the diameter distributions follow a log-normal distribution function, implying cascade fragmentation. For droplets, the number significantly increases at Oh < 1 but the diameter gradually decreases. For wires, the number greatly increases at Oh > 1 while the diameter steadies below 400 nm. Further, the wire diameter is quadrupled at Oh = 16 due to the high viscosity which suppresses both capillary breakup and ligament elongation.
authors.affiliation: WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yaginuma
authors.affiliation: WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: C
authors.initials: C
authors.lastname: Nakajima
authors.affiliation: WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|Dexerials Corporation, Tagajyo, Sakuragi 985-0842, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kaneko
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yokoyama
authors.affiliation: WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: K S
authors.initials: KS
authors.lastname: Nakayama