Grain boundary liquation of zirconium-containing nickel aluminides

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90331-8· OSTI ID:7030803

Chen, G H; Chen, C ^[1]

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1. Inst. of Materials Science and Engineering, National Taiwan Univ., Taipei 10764 (TW)

Nickel aluminide, Ni{sub 3}Al, is an intermetallic compound with the L1{sub 2} crystal structure. The yield strength of the compound increases with increasing temperature, which together with good oxidation resistance makes it suitable for structural applications at elevated temperatures. The mechanical strength of Ni{sub 3}Al; can be improved through ternary or quaternary alloying additions. But, some alloying elements might cause grain boundary liquation at a temperature lower than 1395{degrees}C, the peritectic temperature of the compound. Grain boundary liquation could cause heat-affected zone cracking in the weld, hence lowering the weldability of the compound. The element additions, therefore, should be carefully controlled to prevent grain boundaries from melting at a temperature which is significantly lower than normal. This paper examines the influence of Zr additions on the grain boundary liquation of boron doped nickel aluminides.

• OSTI ID: 7030803
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 27:1; ISSN SCRME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
CHEMICAL REACTIONS
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
FABRICATION
GRAIN BOUNDARIES
JOINING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
PYROLYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
WELDING
YIELD STRENGTH
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS