Metallography, an important division of physical metallurgy, concerns itself with the internal structure and constitution of metals.
Authors: William E. Frazier, Naval Air Systems Command
This article reviews the state-of-the-art of the important, rapidly emerging manufacturing technology that is alternatively called additive manufacturing (AM), direct digital manufacturing, free-form fabrication, three-dimensional (3-D) printing, and so on.
Authors: Revised by Paul G. Kenny, NAVAIR FRCSE, Jacksonville, FL
Ultrasonic inspection is a nondestructive method in which beams of highfrequency mechanical waves are introduced into materials for the detection of surface and subsurface flaws in the material.