Superplasticity and its application to near-net shaping of intermetallic alloys. [NiAl]

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6747675

Sikka, V K

Near-net-shape manufacturing offers the best approach for reducing the cost of a complex-shape component. Among various near-net-shape manufacturing techniques, superplastic forming is best suited for most complex shapes and for hard-to-fabricate materials. This paper describes the newly-developed nickel aluminide intermetallic alloys, use of superplastic forming for near-net-shape processing of these alloys, and mechanical properties and microstructures of the superplastically formed prototype disks out of these alloys. Mechanical properties and microstructures of superplastic disks are also compared with other near-net-shape and conventional processes used for nickel aluminides. Observed mechanical properties of the superplastic disk are explained based on its very fine grain size (10 ..mu..m). Nabarro-Herring creep mechanism was found suitable for explaining the observed creep behavior of nickel aluminide alloys. 10 refs., 15 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6747675
• Report Number(s): CONF-871234-15; ON: DE89001937
• Resource Relation: Conference: ASME winter meeting, Boston, MA, USA, 13 Dec 1987; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
NICKEL ALLOYS
CRYSTAL STRUCTURE
EQUATIONS
GRAIN SIZE
INTERMETALLIC COMPOUNDS
MATERIALS WORKING
MICROSTRUCTURE
PLASTICITY
TEMPERATURE EFFECTS
TENSILE PROPERTIES
ALLOYS
FABRICATION
SIZE
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies
360101 - Metals & Alloys- Preparation & Fabrication