Accession Number : AD0636547

Title :   EFFECTS OF SOLIDIFICATION VARIABLES ON INGOT STRUCTURE.

Descriptive Note : Rept. for Jun 64-Jun 65.

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE CASTING AND SOLIDIFICATION SECTION

Personal Author(s) : Flemings, M. C. ; Bower,T. F. ; Kattamis,T. Z. ; Brody,H. D.

Report Date : 01 MAY 1966

Pagination or Media Count : 124

Abstract : Results are summarized of experimental and analytical studies of solutionizing aluminum alloys containing a non-equilibrium second phase. Dendrite arm spacing, solution treatment temperature, and alloy content are the important processing variables determining time required to eliminate second phase. At a typical temperature used to solutionize 'premium quality' aluminum-4.5 per cent copper alloy castings, required time for essentially complete elimination of second phase is 25 times the original solidification time. Experiments were conducted on dendritic and non-dendritic solidification of aluminum-copper alloys and of a magnesium-zinc alloy. Grain diameter in the non-dendritic melts was found to depend on solidification time in quantitatively the same way as dendrite arm spacing in the dendritic melts.

Descriptors :   (*CASTING ALLOYS, *PHASE STUDIES), FREEZING, GRAIN STRUCTURES(METALLURGY), COPPER ALLOYS, ALUMINUM ALLOYS, MICROSTRUCTURE, MAGNESIUM ALLOYS, ZINC ALLOYS, EUTECTICS, CASTING

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE