EFFECTS OF ULTRASOUND ON DEFORMATION CHARACTERISTICS OF STRUCTURAL METALS

Ultrasound is presented as a new means of studying properties of metals from the viewpoint of dislocation theory. Ustrasound is shown to be efficiently absorbed at dislocations resulting in significant effects on metal plasticity. Materials used were single crystal zinc and aluminum, and polycrystal...

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Bibliographic Details
Main Authors: Langenecker, B, Frandsen, W H, Fountain, C W, Colberg, S R, Langenecker, J A M
Format: Report
Language:English
Subjects:
ALUMINUM
BERYLLIUM
CRYSTAL DEFECTS
DEFORMATION
ELASTIC PROPERTIES
HARDENING
MECHANICAL WAVES
METAL CRYSTALS
PHOTOELASTICITY
PLASTIC PROPERTIES
PROPAGATION
REFINING
STEEL
STEEL 1050
TUNGSTEN
X RAY DIFFRACTION
ZINC
ZONE MELTING
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Summary:Ultrasound is presented as a new means of studying properties of metals from the viewpoint of dislocation theory. Ustrasound is shown to be efficiently absorbed at dislocations resulting in significant effects on metal plasticity. Materials used were single crystal zinc and aluminum, and polycrystalline aluminum, beryllium, steel and tungsten. Methods of specimen preparation and modified metallographic studies are presented along with sources of ultrasound (up to 100 w/sq cm at 20 kc) and devices for the determination of field intensities. A discussion is given of present theories pertaining to the interaction of ultrasonic stress waves and lattice imperfections. The basic investigations resulted in concepts of ultrasonic forming of metals where extensive yielding of metals caused by ultrasound is utilized. (Author)