Structure, properties and fracture of pulsed Nd:YAG laser welded Ti-14. 8wt%Al-21. 3wt%Nb titanium aluminide

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/S0036-9748(88)80122-4· OSTI ID:6003761

Baeslack, W A; Cieslak, M J; Headley, T J

Recent rapid solidification, powder metallurgy and quenching studies on Nb-rich Ti-Al-Nb alloys have determined that rapid cooling suppresses beta decomposition to ..cap alpha../sub 2/ and instead promotes the formation of an ordered BCC ..beta.. superlattice (CsCl) designated as B2. Based on these observations, the present study was initiated in which a pulsed Nd:YAG laser was utilized to generate a rapidly cooled fusion zone microstructure in Ti-14-21 comprised of a potentially ductile ordered ..beta.. phase. The authors have determined that the generation of a metastable ordered ..beta..-phase can improve weld ductility while providing hardness levels superior to that of the base metal. Although laser processing should alleviate weld cracking, the optimization of weld properties in service will require the determination of an optimum stabilizing heat treatment which provides acceptible room and elevated temperature properties.

• Research Organization: The Ohio State Univ., Columbus, OH (US); Sandia National Labs., Albuquerque, NM (US)
• OSTI ID: 6003761
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 22:7; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DUCTILITY
FABRICATION
FAILURES
FRACTURES
JOINING
LASERS
MECHANICAL PROPERTIES
METALLURGY
MICROSTRUCTURE
NEODYMIUM LASERS
NIOBIUM ALLOYS
OPTIMIZATION
PHASE TRANSFORMATIONS
POWDERS
PYROLYSIS
QUENCHING
SOLID STATE LASERS
SOLIDIFICATION
TENSILE PROPERTIES
TERNARY ALLOY SYSTEMS
THERMOCHEMICAL PROCESSES
TITANIUM ALLOYS
WELDING