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Rheological behavior and microstructure of ceramic particulate/aluminum alloy composites. ph.d. thesis final technical report
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Moon, Hee-Kyung |
| Copyright Year | 1990 |
| Description | The rheological behavior and microstructure were investigated using a concentric cylinder viscometer for three different slurries: semi-solid alloy slurries of a matrix alloy, Al-6.5wt percent Si: composite slurries, SiC (sub p) (8.5 microns)/Al-6.5wt percent Si, with the same matrix alloy in the molten state, and composite slurries of the same composition with the matrix alloy in the semi-solid state. The pseudoplasticity of these slurries was obtained by step changes of the shear rate from a given initial shear rate. To study the thixotropic behavior of the system, a slurry was allowed to rest for different periods of time, prior to shearing at a given initial shear rate. In the continuous cooling experiments, the viscosities of these slurries were dependent on the shear rate, cooling rate, volume fraction of the primary solid of the matrix alloy, and volume fraction of silicon carbide. In the isothermal experiments, all three kinds of slurries exhibited non-Newtonian behavior, depending on the volume fraction of solid particles. |
| File Size | 6901536 |
| Page Count | 231 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920018299 |
| Archival Resource Key | ark:/13960/t11p30n0x |
| Language | English |
| Publisher Date | 1990-09-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Ceramic Matrix Composites Concentration Composition Cooling Rheology Silicon Carbides Aluminum Alloys Viscometers Concentric Cylinders Microstructure Slurries Shearing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Thesis |
