Accession Number:

AD0461079

Title:

INVESTIGATION OF FRACTURE MECHANISMS THERMAL STABILITY AND HOT-STRENGTH PROPERTIES OF CONTROLLED POLYPHASE ALLOYS.

Descriptive Note:

Final rept., 13 Mar 64-12 Mar 65,

Corporate Author:

UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT

Report Date:

1965-04-12

Pagination or Media Count:

65.0

Abstract:

The effect of reinforcement size on the room temperature tensile strength of Al-Al3Ni and Al-CuAl2 unidirectionally solidified composites was investigated. Within the range of solidification rates studied 2 to 11 cmhr, the reinforcement size varied by a factor of two times and no effect of reinforcement size on strength was noted. It was found that the variation of tensile strength with temperature closely parallels the behavior noted for S.A.P. A preliminary investigation of the creep behavior of Al-Al3Ni indicates that the strain rate during the second stage of creep is comparable to that of S.A.P. although the total strain is greater. The preferred crystallography for each system persisted after long times at elevated temperatures. The microstructure of each system was changed significantly only by heat treatment at relatively high temperatures. The stability of the microstructure at elevated temperature varied inversely with the solidification rate. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE