Departments of Aerospace & Mechanical Engineering, Materials Science, and Earth Sciences
University of Southern California
Professor Langdon obtained a B.Sc. degree in Physics from the University of Bristol in 1961 and a Ph.D. degree in Physical Metallurgy from Imperial College, University of London, in 1965. He was awarded a D. Sc. degree in Physics at the University of Bristol in 1980 for his published research on the mechanical properties of metals and ceramics. Professor Langdon is on the editorial boards of several journals in materials science, and he is an elected Fellow of the Institute of Physics, the Institution of Metallurgists, the American Ceramic Society and ASM International. He has also served as Visiting Professor at the University of Melbourne, the Universidad Nacional Automona de Mexico, the University of Ancona and the Danish Technical University; as Visiting Senior Fellow at the International Center for Advanced Studies, Nizhny Novgorod, Russia; and as Visiting Scientist at the Riso National Laboratory, Denmark.
MECHANICAL PROPERTIES OF METALS AND CERAMICS
OBJECTIVES: Research is conducted to determine the mechanical properties of a wide range of metals and ceramics at elevated temperatures. This program is designed to integrate experimental data with the development of theoretical interpretations based on mechanistic models at the atomic level.
1. A unifed approach has been developed for high temperature creep which combines mechanical characteristics with microstructural observations. This approach is now being refined for application to metallic solid solution alloys, precipitate hardened materials and metal-matrix and ceramic-matrix composites.
2. An extensive research program is in progress to determine the major characteristics of superplastic deformation in both metals and ceramics. The primary areas of interest include the role of interphase and intercrystalline sliding, the macroscopic factors influencing the elongation to failure, and the role of internal cavitation.
3. Grain boundary migration is important in high temperature fatigue when the testing frequency is very low. Experiments are in progress both to investigate the nature of this process and to provide a mechanistic interpretation.
FACILITIES: The Mechanical Properties Laboratory is equipped with standard tensile testing machines, plus a wide range of creep machines for tests in tension, compression and shear. Optical and interferometric microscopes are available in the Laboratory, and transmission and scanning electron microscopes are also available.