Accession Number : AD0617399

Title :   PHASE TRANSFORMATIONS IN THE ALLOY, TI : 8%A1 : 1%MO : 1%V,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : Blackburn,Martin J.

Report Date : JAN 1965

Pagination or Media Count : 84

Abstract : The micro-structures of the alloy Ti : 8%A1 : 1%Mo : 1%V after various heat treatments have been studied by transmission electron microscopy. An ordering reaction occurs in the alpha phase, the critical temperature for the reaction being approximately 525 C, electron diffraction results are consistent with the formation of a DO sub 19 type superlattice. The beta-phase transforms martensitically when quenched from temperatures above approximately 875 C. Two forms of martensite have been found, a heavily faulted hexagonal or face centered cubic structure alpha' formed at low temperatures and a hexagonal structure alpha double' formed at higher temperatures. Aging of a supersaturated beta-phase or the martensitic structures alpha' or alpha double' result in the formation of mixtures of the alpha and beta-phases, however, the reaction mechanisms are shown to be dependent on the initial structures. The results are related to some of the mechanical properties of the alloy and an attempt is made to account for the differences in properties of Duplex and Mill Annealed material. (Author)

Descriptors :   (*TITANIUM ALLOYS, PHASE STUDIES), (*PHASE STUDIES, TITANIUM ALLOYS), ALUMINUM ALLOYS, MOLYBDENUM ALLOYS, VANADIUM ALLOYS, MICROSTRUCTURE, HEAT TREATMENT, TRANSITION TEMPERATURE, ELECTRON DIFFRACTION, CRYSTAL LATTICES, TRANSFORMATIONS, MARTENSITE, QUENCHING, AGING(MATERIALS), CRYSTAL DEFECTS, MECHANICAL PROPERTIES, DEFORMATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE