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3032418 
Journal Article 
Ultrasonic Processing of Materials 
Han, Q 
2015 
1 
Metallurgical and Materials Transactions B - Process Metallurgy and Materials Processing Science
ISSN: 1073-5615 
46 
4 
1603-1614 
WOS:000359022000009 
Irradiation of high-energy ultrasonic vibration in metals and alloys generates oscillating strain and stress fields in solids, and introduces nonlinear effects such as cavitation, acoustic streaming, and radiation pressure in molten materials. These nonlinear effects can be utilized to assist conventional material processing processes. This article describes recent research at Oak Ridge National Labs and Purdue University on using high-intensity ultrasonic vibrations for degassing molten aluminum, processing particulate-reinforced metal matrix composites, refining metals and alloys during solidification process and welding, and producing bulk nanostructures in solid metals and alloys. Research results suggest that high-intensity ultrasonic vibration is capable of degassing and dispersing small particles in molten alloys, reducing grain size during alloy solidification, and inducing nanostructures in solid metals. (C) The Minerals, Metals & Materials Society and ASM International 2015