Abstract

The dimensional stability of directionally cast grain microstructures was compared with that of normal randomly oriented grain microstructures in aluminum alloys. In general, directionally solidified aluminum mirror substrates exhibited superior dimensional stability as compared with castings exhibiting normal random microstructures. These findings are discussed in terms of the fundamental metallurgy of cast aluminum alloys.

© 1973 Optical Society of America

Substrate temperature and strain during sputter deposition of aluminum on cast borosilicate glass in a Gemini Observatory coating chamber

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Effect of Atmospheric Exposure on the Infrared Reflectance of Silvered Mirrors With and Without Protective Coatings

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