The role of microstructure on strength and ductility of hot-extruded mechanically alloyed NiAl

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02666334· OSTI ID:6303094

Dollar, M; Nash, P ^[1]; Dymek, S ^[2]; Hwang, S J ^[3]

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1. Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Metallurgical and Materials Engineering
2. Academy of Mining and Metallurgy, Krakow (Poland). Dept. of Metallurgy
3. Univ. of Tsukuba (Japan). Inst. of Materials Science

Mechanical alloying followed by hot extrusion has been used to produce very fine-grained NiAl-based alloys containing oxide dispersoids. The dispersoids affect the progress of recrystallization during hot extrusion and contribute to the preservation of the (110) deformation fiber texture, The <110> texture enables the activation of (110) < 100 > and (110) < 110 > slip systems. The occurrence of < 100 > and < 110 > slip dislocations satisfies the von Mises criterion for general plasticity and is postulated to contribute to notable room-temperature compressive ductility of the mechanically alloyed (MA) materials. Another factor likely affecting the compressive ductility is the predominant occurrence of low-angle grain boundaries. The attractive dislocation dispersoid interactions lead to a ductility trough observed at 800 K in the MA materials. The MA NiAl materials are strong at both ambient and elevated temperatures due to fine grain and the presence of dispersoids and interstitial atoms.

• OSTI ID: 6303094
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24:9; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360103 -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
COHERENT SCATTERING
COMPRESSION STRENGTH
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISLOCATIONS
DUCTILITY
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
EXTRUSION
FABRICATION
GRAIN BOUNDARIES
INFORMATION
INTERMETALLIC COMPOUNDS
LINE DEFECTS
MACHINING
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MILLING
NICKEL ALLOYS
NUMERICAL DATA
OPTICAL MICROSCOPY
PLASTICITY
RECRYSTALLIZATION
SCATTERING
TENSILE PROPERTIES
TEXTURE
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION