Explosive Shock And Laser Exposure Of Metallic
And Ceramic Materials
Author(s)
O. T. Inal, P. F. Gerity & D. H. Lopez
Abstract
Explosive shock and Q-switched laser exposure of metallic and ceramic
materials have produced varied substructures and increased hardness that
possibly emphasize the role of the attendant material structures and the nature of
the defect substructures that are subsequently obtained. In metallic materials,
Q-switched laser exposure is seen to result in extensive heating as well as shock
wave passage effect, while the control of temperature in explosive detonation is
seen to introduce shock effect and associated defect substructure. For example,
explosive shock exposure of Al-Li 8090 alloy is seen to increase hardness,
reduce activation energy for subsequent ageing, introduce precipitation,
revealing the extensive role defect substructure plays in the ageing kinetics of
this alloy. Shock loading of Molydenum at 150 kbar (for 2 µs) increases
dislocation loop densities from 5x109/cm3 to 4x1014/cm3 with 75% of the loop
types analyzed being vacancy loops. Irradiations utilizing a Q-switched laser at
also of Mo at fluences between 22 and 35 J/cm2 produced residual effects
ranging from increasing numbers of lattice vacancies and vacancy clusters to
massive deformation, cavitation, and spallation along with melting. Finally,
explosive shock exposure, at various calculated pressures, of Al203, Al203+Zr02,
Al203+SiC (whisker), Al203+Zr02+SiC (whisker), showed no significant
difference in mechanical properties of hot-pressed Al203+Zr02 composites with
regard to shock treatment. Improved mechanical properties were occasionally
found in shock-treated and hot-pressed whisker-reinforced alumina, although a
direct relationship with shock pressure was not observed.
The manuscript summarizes these different studies in delineating the role of
shock waves passage in the subsequent material processing. This is an overview
of these research projects and fuller details can be found in the cited references.
Keywords
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