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| Amiya Mukherjee | |
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email: akmukherjee@ucdavis.edu |
| Office: 2005 Kemper Hall | |
| Phone: (530)752-1776 | |
| Distinguished Professor | ||
| B.S., 1954, University of Calcutta M.S., 1959, University of Sheffield Ph.D., 1962, Oxford University | ||
Research  | ||
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| Theme: Processing-Characterisation-Physical Mechanical and Failure Behavior-Modeling-Predictive Capacity. Processing and Properties of Nanocrystalline Ceramics: The focus of this research is to investigate the processing methods for oxide and non-oxide ceramics which will produce nanocrystalline microstructures that can improve creep and toughness properties. Emphasis is on consolidation, microstructural evaluation and mechanical properties of nanocrystalline state. Characterization of Nanocrystalline Materials: The goal is to obtain fully dense, crack-free nanocrystalline materials. Once processing conditions are optimized, the materials will be characterized to determine whether their nanocrystalline microstructures are retained. Compression tests will be performed to determine the creep properties at elevated temperatures. The materials under investigation are alumina, tungsten-carbide-cobalt and nanocrystalline titanium aluminides. Superplastic Deformation in Intermetallic Alloys: Superplastic deformation of a gamma-TiAl and Orthorhombic Titanium Aluminides are investigated to test the effect of testing temperature, strain rate, and environments. Microstructural evolution during deformation is examined with optical microscopy, SEM, and TEM, DTA/DSC and then correlated to the mechanical properties. The information provides an understanding of the deformation mechanism requirements for superplasticity and could lead to development of new and modified alloy and processing methods for next generation gas turbine engines. Laminated metal composites are being studied for their fracture toughness, elevated temperature mechanical properties, and damping characteristics for possible utilization advanced as structural materials for aerospace and terrestrial applications. Physical Mechanism of Superplastic Flow: The purpose of this research is to characterize superplastic flow in different microstructural scales, i.e., at the scale of the entire deformed volume, at the scale of grain groups, and at the scale of individual grains. The bridging of the approach of solid-state and that of physics of plasticity is emphasized. High-Temperature Deformation of Titanium Samples with Superplastic Layers: This work focuses on high-temperature mechanical behavior and progressive deformation characteristics on the scale of the entire deformed volume and individual grain groups of industrial significant aluminum alloys with superplastic layers sandwiched between non-superplastic layers. This research will have important technological significance and is carried out in collaboration with an industrial corporation. | ||
Laboratories | ||
| Elevated temperature deformation testing is done with three automated servo-hydraulic systems. All are modern MTS systems which are programmed for constant temperature and one or more constant true stain rates in a single test. One system is used for tensile testing at temperatures up to 1050 C in air or inert atmospheres and the second is used for tensile testing under high vacuum at temperatures up to 1800 C. The third system is used to perform compression tests at temperatures up to 1500 C. Creep testing is done with a constant stress creep machine, a high-vacuum chamber and temperatures as high as 1550 C. Consolidation of the nanocrystalline powders is also done on campus as are specimen preparation, optical microscopy, SEM, TEM, XRD, XRF and EPMA. In addition, facilities for measurement of elastic modulus and internal friction at various temperatures, equipments for optical metallography and specimen preparation for electron microscopy are also available to student users. Nuclear Magnetic Resonance Spectroscopy, Field Activated Electrical Resistance Sitnering and High Pressure Sintering Facilities are available to the student researchers. | ||
Support | ||
| National Science Foundation (Ceramics program) National Science Foundation (Metallurgy program) National Science Foundation (International Program) National Science Foundation (Materials & Mechanics Program) National Science Foundation (Materials Processing & Manufacturing) |
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