Powder metallurgically produced Ni-35 at. % Al compacts -- a first assessment

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90287-9· OSTI ID:7278666

Wolska, J; Maas, J; Beyer, J ^[1]; Chandrasekaran, M ^[2]

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1. Univ. of Twente, Enschede (Netherlands). Faculty of Mechanical Engineering
2. A.M.T.n.v., Herk-de-Stad (Belgium)

The intermetallic phase [beta] NiAl to be an alloy with high heat resistance and good oxidation resistance and is being developed as a potential material for high temperature applications. In addition, off-stoichiometric nickel rich [beta] Ni-Al compositions are known to undergo a thermoelastic martensitic transformation and exhibit shape memory effect at relatively high temperatures. There is no major difficulty in processing these alloys at elevated temperatures. However, thy suffer a major problem of brittle fracture and poor ductility at ambient temperature. In this regard it has been suggested that finer grained NiAl can exhibit enhanced ductility. Moreover, in quenched alloys containing [>=]35at.% Al there is a problem with reversibility of the martensitic transformation. This is because, martensite decomposes on heating by temperate and this suppresses subsequent transformation to martensite on cooling. The aim of this work was to investigate the possibility of producing nickel rich Ni-Al alloys by P/M route. It will also be shown that the tendency for martensite to temper is suppressed with such a method of preparation.

• OSTI ID: 7278666
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:3; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
DATA
EXPERIMENTAL DATA
FABRICATION
GRAIN SIZE
INFORMATION
INTERMETALLIC COMPOUNDS
METALLURGY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
POWDER METALLURGY
SINTERING
SIZE