Accession Number : AD0625829

Title :   X-RAY STUDY OF THE K-STATE IN METALLIC SOLID SOLUTIONS.

Descriptive Note : Final rept. 19 Oct 62-18 Oct 65,

Corporate Author : FLORIDA UNIV GAINESVILLE METALLURGICAL RESEARCH LAB

Personal Author(s) : Guy, Albert G.

Report Date : 08 DEC 1965

Pagination or Media Count : 10

Abstract : The following important results were obtained in the investigation of the K-effect in nickel-aluminum alloys. Nickel-aluminum alloys containing 8.2 and 11.3 at. % Al were treated to produce the 'K-state' in various degrees and were then studied using x-ray scattering, small angle scattering, electrical resistivity and electron microscopy. The results were interpreted as showing that the K-state phenomena can be attributed to different structural states in the two alloys studied. In the 8.2 at . % Al alloy, representative of compositions in the solid-solution region, the anomalous increase in resistivity indicative of the K-state was attributed only to short-range order. In the 11.3 at . % alloy, which lies in the two phase region of the equilibrium diagram, this K-state phenomenon was attributed primarily to Guinier Preston zones and secondarily to short-range order. Thus, an important property characterizing the K-state, the increase in electrical resistivity, was found to be caused by two different structural changes.

Descriptors :   *METAL CRYSTALS, *PHASE STUDIES, SOLID SOLUTIONS, X RAY DIFFRACTION, NICKEL, ALUMINUM ALLOYS, ELECTRICAL RESISTANCE.

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE