Accession Number : AD0286445

Title :   METALLURGICAL ANALYSIS OF ABLATED ALUMINUM ALLOY HEMISPHERES

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y

Personal Author(s) : FISCHER,G.J. ; MACIAG,R.

Report Date : JUL 1962

Pagination or Media Count : 1

Abstract : A metallurgical anal sis was performed on 3 Al alloy (356 T-6) hemispherical nose cones which were ablated in a hypersonic tunnel. The analysis consisted of macroscopic examination, metallography and hardness measurements of the cross-sectioned surfaces of the hemispheres. The results of the metallurgical tests were correlated with temperature data, and used to evolveA METHOD OF REVEALING THE HEAT ABSORPTION GRADIENT THROUGHOUT THE HEMISPHERES. Conclusions: Hardness gradient data correlate with temperature and heat absorption data. The hardness and macrostructure studies provide an additional method of observing results of heat absorption gradients. Ablation damage was due to removal of melted eutectic by the high-energy air stream. The hardness-macrostructure gradient studies can be applied to alloys other than aluminum for higher temperature range investigations. (Author)

Descriptors :   *ALUMINUM ALLOYS, *ROCKET NOSES, ABLATION, ABSORPTION, AERODYNAMIC HEATING, HEAT, HEAT RESISTANT METALS + ALLOYS, HYPERSONIC FLOW, MECHANICAL PROPERTIES, METALLURGICAL ANALYSIS, MICROPHOTOGRAPHY, PHASE STUDIES, PHOTOGRAPHIC ANALYSIS, SURFACES

Distribution Statement : APPROVED FOR PUBLIC RELEASE