Effect of thermal residual stress on the mechanical properties of NiAl-based composites

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20001608

Choo, H; Bourke, M; Nash, P

NiAl-based hybrid composites containing 5, 15 and 30 volume percent of Al{sub 2}O{sub 3} fibers in addition to AlN dispersion particles were fabricated via a powder metallurgy route. The strengthening mechanisms associated with the short Al{sub 2}O{sub 3} fiber in NiAl-(AlN){sub dispersion}-(Al{sub 2}O{sub 3}){sub fiber} composite were studied with an emphasis on the effect of thermal residual stress on the compressive strength at room temperature and 1,300K. At 300K, the yield strength of the composites was predicted using a linear superposition of the monolithic yield strength, direct fiber strengthening and tensile matrix residual stresses. The prediction shows good agreement with the measured data. The majority of the room temperature strengthening is attributable to the residual stress. At 1,300K, the strengthening was achieved only by the load sharing of the fibers and there is no direct influence from the process-induced thermal residual stresses since they were completely relaxed at this temperature.

• Research Organization: Los Alamos National Lab., NM (US)
• Sponsoring Organization: US Department of the Air Force; US Department of Energy
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 20001608
• Report Number(s): CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
COMPOSITE MATERIALS
COMPRESSION STRENGTH
NICKEL ALLOYS
PREDICTION EQUATIONS
RESIDUAL STRESSES
TEMPERATURE DEPENDENCE
VALIDATION