NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Rheological Behavior and Microstructure of Ceramic Particulate/Aluminum Alloy CompositesThe 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.
Document ID
19920018299
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Moon, Hee-Kyung (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1990
Subject Category
Metallic Materials
Report/Patent Number
MIT/OSP-99328
NAS 1.26:190036
NASA-CR-190036
Accession Number
92N27542
Funding Number(s)
CONTRACT_GRANT: N00014-85-K-0645
CONTRACT_GRANT: NAG3-808
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available