Chill cast particulate composites

Abstract

Abstract A DUCTILE AND HIGH STRENGTH CHILL CAST BERYLLIUM COMPOSITE COMPOSED ESSENTIALLY OF BERYLLIUM PARTICLES SUBSTANTIALLY SURROUNDED BY AN ALLOY MATRIX OF ALUMINUM-MAGNESIUM-SILICON. THE COMPOSITE CONSISTS ESSENTIALLY OF ABOUT 85-60% BY WEIGHT BERYLLIUM, ABOUT 39.5-13% BY WEIGHT ALUMINUM, ABOUT 3.6-0.10% BY WEIGHT MAGNESIUM, AND ABOUT 1.5-0.08% BY WEIGHT SILICON. WITHIN THE RANGES OF PROPORTIONS OF ELEMENTS CONTRIBUTING TO THE DUCTILITY AND STRENGTH OF THE COMPOSITE, TWO DIFFERENT ALLOY MATRIX SPECIES ARISE. ONE OF THE ALLOY MATRIX SPECIES CONTAINS AN EXCESS OF SILICON TO MAGNESIUM TO A DEGREE WHEREBY THE MATRIX ALLOY MAY BE CATEGORIZED AS SILICON RICH WITH RESPECT TO THE MAGNESIUM CONTENT. IN THE SILICON RICH ALLOY MATRIX SUBSTANTIALLY ALL OF THE MAGNESIUM WILL COMBINE WITH THE SILICON. THE REMAINING ALLOY MATRIX SPECIES CONTAINS AN EXCESS OF MAGNESIUM TO SILICON TO A DEGREE WHEREBY THE MATRIX ALLOY MAY BE CATEGORIZED AS MAGNESIUM RICH WITH RESPECT TO THE SILICON CONTENT. THE MECHANICAL PROPERTIES OF THE COMPOSITES EMBODYING THE SILICON RICH ALLOY MATRIX AND THE MAGNESIUM RICH ALLOY MATRIX, SUCH AS DUCTILITY AND STRENGTH, ARE OUTSTANDING HOWEVER, THE DUCTILITY AND STRENGTH CHARACTERISTICS OF THE COMPOSITES EMBODYING THE SILICON RICH ALLOY MATRIX ARE MORE OUTSTANDING THAN THE DUCTILITY AND STRENGTH CHARACTERISTICS OF THE COMPOSITES EMBODYING THE MAGNESIUM RICH ALLOY MATRIX.

Inventors

• 👤 Leonard B Griffiths

Bibliographic Details