Fabrication and mechanical properties of Ni/sub 3/Al--Al/sub 2/O/sub 3/ composites

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6728818

McKamey, C G; Povirk, G L; Horton, J A; Tiegs, T N; Ohriner, E K

The objective of this study is to develop a metal-matrix composite based on the intermetallic alloy Ni/sub 3/Al reinforced with Al/sub 2/O/sub 3/ fibers, with improved high-temperature strength and lower density compared to the matrix material. This paper summarizes results of initial fabrication and mechanical tests on specimens produced using IC-15(Ni-24% Al-0.24% B (at.%)) and IC-218 (Ni-16.5% Al-8% Cr-0.4% Zr-0.1% B (at.%)), with 20 vol. % Al/sub 2/O/sub 3/ fibers. Fabrication methods include both hot-pressing and hot-extrusion. Mechanical tests include four-point bending and tensile tests. The integrity of the fiber-matrix interface was studied and correlated with mechanical properties. Tensile ductilities of approximately 10% at room temperature were achieved for Ni/sub 3/Al/Al/sub 2/O/sub 3/ composites with controlled material processing and interfacial structure. Fabrication of composites by hot-extrusion produced better tensile properties at room temperature, but superplastic behavior (i.e., low strengths, high ductilities) at 1000/degree/C. 9 refs., 3 figs., 2 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6728818
• Report Number(s): CONF-881155-6; ON: DE89003105
• Resource Relation: Conference: Fall meeting of the Materials Research Society, Boston, MA, USA, 28 Nov 1988; 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
ALUMINIUM OXIDES
NICKEL ALLOYS
COMPOSITE MATERIALS
EXTRUSION
FABRICATION
GRAIN SIZE
HOT PRESSING
INTERMETALLIC COMPOUNDS
MATRIX MATERIALS
MICROSTRUCTURE
TENSILE PROPERTIES
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
MATERIALS
MATERIALS WORKING
OXIDES
OXYGEN COMPOUNDS
PRESSING
SIZE
360603* - Materials- Properties
360601 - Other Materials- Preparation & Manufacture