Localized Atomic Segregation in the Spalled Area of a Zr50Cu40Al10 BMG Induced by Laser-shock Experiment
Article dans une revue avec comité de lecture
Author
LOISON, Didier
36484 ArcelorMittal Maizières Research SA
57111 Institut de Physique de Rennes [IPR]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
36484 ArcelorMittal Maizières Research SA
57111 Institut de Physique de Rennes [IPR]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
LESCOUTE, Emilien
9658 Laboratoire de Détection et de Géophysique (CEA) [LDG]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
119523 DAM Île-de-France [DAM/DIF]
9658 Laboratoire de Détection et de Géophysique (CEA) [LDG]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
119523 DAM Île-de-France [DAM/DIF]
Date
2017Journal
Journal of Physics D: Applied PhysicsAbstract
Laser-shock experiments were performed on a ternary Zr50Cu40Al10bulk metallic glass. A spalling process was studied through post-mortem analyses conducted on a recovered sample and spall. Scanning electron microscopy magnification of fracture surfaces revealed the presence of a peculiar feature known as cup-cone. Cups are found on sample fracture surface while cones are observed on spall. Two distinct regions can be observed on cups and cones: a smooth viscous-like region in the center and a flat one with large vein-pattern in the periphery. Energy dispersive spectroscopy measurements conducted on these features emphasized atomic distribution discrepancies both on the sample and spall. We propose a mechanism for the initiation and the growth of these features but also a process for atomic segregation during spallation. Cup and cones would originate from cracks arising from shear bands formation (softened paths). These shear bands result from a quadrupolar-shaped atomic disorder engendered around an initiation site by shock wave propagation. This disorder turns into a shear band when tensile front reaches spallation plane. During the separation process, temperature gain induced by shock waves and shear bands generation decreases material viscosity leading to higher atomic mobility. Once in a liquid-like form, atomic clusters migrate and segregate due to inertial effects originating from particle velocity variation (interaction of release waves). As a result, a high rate of copper is found in sample cups and high zirconium concentration is found on spall cones.
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