Accession Number : AD0782596

Title :   The Microstructure of Titanium Alloys as Influenced by Thin-Foil Artifacts,

Corporate Author : ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CALIF SCIENCE CENTER

Personal Author(s) : Spurling,R. A. ; Rhodes,C. G. ; Williams,J. C.

Report Date : 1974

Pagination or Media Count : 17

Abstract : The occurrence of a variety of thin foil artifacts which form during preparation of electron microscope thin foils from Ti alloys have been described in the literature. These artifacts severely complicate the study of phase transformations and microstructure/property relations in Ti alloys. This paper illustrates several examples of such artifacts which occur in a wide range of alloys and show how their presence can be bothersome and, in some instances, grossly misleading. Examples include 'spontaneous relaxation' in beta-phase alloys, reversion of martensite and modification of omega-phase precipitates. An ion-thinning technique has been developed which suppresses the occurrence of thin foil artifacts, thereby permitting examination of alloys and microstructures which previously have not been analyzed. The structures of ion-thinned samples are illustrated and compared to the structures observed in conventionally thinned samples. (Author)

Descriptors :   *Titanium alloys, *Foils(Materials), *Microstructure, Phase transformations, Ions, Polishes, Electron microscopy

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE