Non-equilibrium synthesis by laser cladding of Ni, Nb and Mg alloys for improved environmental resistance. Final report, Nov 88-Oct 91

Technical Report · Mon Mar 30 00:00:00 EST 1992

OSTI ID:5007766

Mazumder, J; Kar, A; Tewari, S K; Ribaudo, C R

The technique of laser surface modification provides a unique means of synthesizing novel nonequilibrium materials in near net shape. The goal of the proposed program is to develop a science base for synthesis of nonequilibrium metastable alloys by laser processing. This report summarizes experimental and theoretical studies carried out during the period of November 1988 to October 1991 on laser surface modification of Ni, Nb and Mg alloys for improved environmental resistance at high temperature. A microstructural evolution model of NbAl3 was developed and the relative oxidation resistance of claddings of several Nb-based alloys were investigated. Initial work with V revealed that V increases the ductility, and decreases the oxidation resistance of laser clad NbAl3. Oxidation behavior of alloys with Ti, B and Hf as a ternary alloy addition were identified: Oxidation tests at 800, 1200, and 1400 deg C were conducted on NbAl3-0 at %B (O B), NbAl3-0.5 at %B (0.5 B), NbAl3-1.0 at %B (1.0 B), NbAl3-1.0 at B-3 at %Ti (3 Ti), NbAl3-1.0 at %B-6 at %Ti (6 Ti) and NbAl3-1.5 at %Hf (1.5 Hf) alloys. An external layer of x-alumina formed on samples of alloys 0.5 B and 1.0 B isothermally oxidized in air at 800, 1200 and 1400 deg C. A mixture of alumina and NbAl04 formed on the samples of alloy 0 B exposed to same testing conditions.

• Research Organization: Illinois Univ., Urbana, IL (United States). Dept. of Mechanical and Industrial Engineering
• OSTI ID: 5007766
• Report Number(s): AD-A-250552/7/XAB; CNN: AFOSR-89-0061
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNESIUM ALLOYS
CORROSION RESISTANCE
SURFACE TREATMENTS
NICKEL ALLOYS
NIOBIUM ALLOYS
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
BONDING
CLADDING
DUCTILITY
LASERS
MATHEMATICAL MODELS
MICROSTRUCTURE
MIXTURES
OXIDATION
OXIDES
POWDERS
PROCESSING
SURFACES
SYNTHESIS
TERNARY ALLOY SYSTEMS
THERMAL ANALYSIS
THERMAL STRESSES
ALLOY SYSTEMS
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DEPOSITION
DISPERSIONS
FABRICATION
INDUSTRY
JOINING
MECHANICAL PROPERTIES
OXYGEN COMPOUNDS
STRESSES
SURFACE COATING
TENSILE PROPERTIES
360101* - Metals & Alloys- Preparation & Fabrication
360105 - Metals & Alloys- Corrosion & Erosion