Characterization of solid-phase welds between Ti-6Al-2Sn-4Zr-2Mo-0. 01Si and Ti-13. 5A1-21. 5Nb titanium aluminide

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Materials Characterization; (United States)

DOI:https://doi.org/10.1016/1044-5803(94)90140-6· OSTI ID:6592048

Baeslack, III, W A; Juhas, M; Fraser, H L ^[1]; Broderick, T F ^[2]

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1. Ohio State Univ., Columbus, OH (United States)
2. Wright Labs., Wright Patterson AFB, OH (United States). Materials Directorate

Dissimilar-alloy welds have been produced between Ti-6Al-2Sn-4Zr-2Mo-0.1Si (wt.%) and Ti-13.5Al-21.5Nb (wt.%) titanium aluminide using three different solid-phase welding processes that create significantly different thermo-mechanical conditions at the weld interface. Exposure to supertransus temperatures, appreciable deformation and rapid cooling of the weld interface region during linear-friction welding promote dynamic recrystallization of beta grains and beta decomposition to fine martensitic products. In contrast, diffusion welding at temperatures below the base metal beta transus temperatures and at relatively low pressures minimizes deformation and microstructural variations in the weld interface region relative to the unaffected base metal. During capacitor-discharge resistance spot welding, extremely rapid heating of the weld interface region to near-solidus temperatures, and subsequent rapid cooling, result in the formation of a metastable, ordered-beta microstructure in the Ti-13.5ASl-21.5Nb and fine alpha-prime martensite in the Ti-6Al-2Sn-4Zr-2Mo-0.1Si.

• OSTI ID: 6592048
• Journal Information: Materials Characterization; (United States), Journal Name: Materials Characterization; (United States) Vol. 33:4; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
FABRICATION
HEAT AFFECTED ZONE
JOINING
JOINTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
PHASE TRANSFORMATIONS
SILICON ADDITIONS
SILICON ALLOYS
TIN ALLOYS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
WELDED JOINTS
WELDING
ZIRCONIUM ALLOYS
ZONES