Effect of microstructure on the deformation modes and mechanical properties of Ti-6Al-2Nb-1Ta-0. 8Mo. I. Widmanstaetten structures

Journal Article · Fri Jun 01 00:00:00 EDT 1984 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02644717· OSTI ID:6511053

Lin, F S; Starke, Jr, E A; Chakrabortty, S B; Gysler, A

An alpha + beta Ti-6Al-2Nb-1Ta-0.8Mo alloy with an initial Widmanstaetten structure was thermally treated to produce a wide range of microstructures. The effects of individual microstructural parameters on deformation behavior and mechanical properties were investigated. The results show that the Widmanstaetten colony boundaries are major barriers to slip. However, the slip distance can be decreased to a distance equal to the thickness of acicular alpha by transforming the beta phase in the Widmanstaetten structure to martensite by quenching from 950 C. The decrease in slip distance is accompanied by a 25 pct increase in yield strength with no loss in ductility. A large decrease in ductility occurs after excursions above the beta-transus. The development of both equiaxed beta grains during heating in the beta phase field and continuous grain boundary alpha during cooling in the alpha + beta phase field leads to strain localization along prior beta grain boundaries.

• Research Organization: Reynolds Metals Co., Richmond, VA
• OSTI ID: 6511053
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 15A; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
EDGE DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
TANTALUM ALLOYS
TENSILE PROPERTIES
TITANIUM
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
TITANIUM-ALPHA
TITANIUM-BETA
TRANSITION ELEMENTS
WIDMANSTAETTEN STRUCTURE