Accession Number : ADA259414


Title :   Microstructural Development In a Spray Formed Aluminum-Silicon Carbide Based Metal Matrix Composite


Descriptive Note : Annual rept. no. 2, 1 Jan-31 Dec 1992


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK


Personal Author(s) : Howell, Paul R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259414.pdf


Report Date : Jan 1992


Pagination or Media Count : 38


Abstract : The aging response of an 8090-SiC composite at 190 deg C has been monitored using microhardness tests, microhardness tests and transmission electron microscopy(TEM). Intriguingly, it has been found that the composite does not exhibit increased aging kinetics when compared with a control 8090 alloy. Both the control alloy and the composite exhibit a two stage strengthening behavior which is attributed to the precipitation of Delta' (Al3Li) and S' (Al2CuMg). Quantitative microscopy of the composite has been initiated since it has been found that T2 (Al6CuLi3), precipitates on the SiC/matrix interface. Hence, the interfacial area per unit volume(Sv) is of the utmost importance. Finally, the effects of T2 precipitates, at the SiC/matrix interface, on the distribution of Delta' have been determined.


Descriptors :   *METAL MATRIX COMPOSITES , *CARBIDES , *ALUMINUM , *SPRAYS , *SILICON CARBIDES , TEST AND EVALUATION , VOLUME , ALLOYS , ELECTRON MICROSCOPY , ELECTRONS , RESPONSE , MICROHARDNESS , PRECIPITATES , KINETICS , COPPER , PRECIPITATION , LITHIUM , MICROSCOPY , MICROSTRUCTURE , AGING(MATERIALS) , INTERFACES


Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE