Accession Number : AD0748658

Title :   The Influence of Interlamellar Spacing on the Strength of the Ni3Al-Ni3Cb Eutectic.

Descriptive Note : Technical rept.,

Corporate Author : UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CONN

Personal Author(s) : Thompson,E. R. ; George,F. D. ; Breinan,E. M.

Report Date : SEP 1972

Pagination or Media Count : 13

Abstract : The temperature dependence of the tensile properties was determined for the eutectic after directional solidification at rates between 0.5 and 10.6 cm/hr. The cubic gamma' in the eutectic grows in the (110) and the orthorhombic delta in the (100). The preferred slip plane of the delta phase is parallel to the growth direction and, in response to a longitudinal stress, deformation in the delta occurred initially by twinning. The lamellar spacing which decreased with increased solidification rate was found to affect the tensile strength of the eutectic according to a Hall-Petch correlation. By decreasing the spacing by a factor of 4.7, the room temperature strength was increased by 35 percent and the strength at 2000F by 100 percent. The eutectic grown at 10.6 cm/hr possessed the phenomenal strength of 130,000 psi at 2000F. (Author)

Descriptors :   (*NICKEL ALLOYS, *EUTECTICS), ALUMINUM ALLOYS, NIOBIUM ALLOYS, INTERMETALLIC COMPOUNDS, MICROSTRUCTURE, TENSILE PROPERTIES, CREEP

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE