High temperature deformed microstructures of mechanically alloyed NiAl-based composites

Journal Article · Wed May 01 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00661-3· OSTI ID:233888

Cheng, Y ^[1]

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1. Beijing Inst. of Technology (China). Metal Materials Section

Mechanical alloying (MA) has been recently used to fabricate NiAl-based composites and nickel aluminides containing refractory-metal dispersoids since the high melting temperature of the NiAl results in difficulties in employing the casting route. The results exhibit that considerable strengthening by fine dispersoids with homogeneous distribution at both room temperature (RT) and high temperature (HT) has been achieved in the composites. In addition, the improved fracture toughness at RT was also reported in some of the relevant work. However, the microstructure and dislocation configuration after deformation at HT in MA NiAl-based composites, including the interaction between dislocations and dispersoids which are closely linked with the strengthening mechanism, have not been investigated in detail in the published work. This paper reports characteristics of compressively deformed microstructures of the MA NiAl-TiB{sub 2}-Y{sub 2}O{sub 3} composite at 1,273 K and the possible strengthening mechanism available in the composite is discussed.

• OSTI ID: 233888
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
COMPRESSION STRENGTH
DEFORMATION
DISLOCATIONS
DISPERSIONS
GRAIN BOUNDARIES
GRAIN SIZE
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NICKEL ALLOYS
STRAIN RATE
TEMPERATURE DEPENDENCE
TITANIUM BORIDES
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM ADDITIONS