Accession Number:

AD0617399

Title:

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

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s):

Report Date:

1965-01-01

Pagination or Media Count:

84.0

Abstract:

The micro-structures of the alloy Ti 8A1 1Mo 1V 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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE