Dispersion Strengthened Intermetallics by Mechanical Alloying: Creep Results and Dislocation Mechanisms
نویسندگان
چکیده
منابع مشابه
Dislocation-Obstacle Interactions and Mechanical Properties of Intermetallics
The mechanical properties of materials are discussed for different configurations of the obstacles (in series or in parallel), different dislocation-obstacle regimes (exhaustion or crossing) and different obstacle strengths (one type of obstacle or a spectrum of obstacles of different strengths). The models proposed for Ni3AI are compared in what concerns the yield stress anomaly and the partia...
متن کاملDislocation mechanisms of creep in Ni3Al
The compressive creep deforrn;~tiort microstructure of polycrystalline Ni3AI h:is been observed by transnlission electron microscopy (TEM). ( 1 1 I ) rind ( 110) slip systems have been identified in primary creep. Dissociatiort of edge superparti:~l pairs perpendicular to the slip plane (both { 11 1 ) and ( 110) ) is common in crept specimens. I'he formation of this superdislocation...
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Coand Fe-based alloys produced by powder technology are being widely used as a matrix for diamond-containing composites in cutting, drilling, grinding pplications, etc. The severe service conditions demand that the mechanical and tribological properties of these alloys be improved. Development of metal-matrix composites (MMCs) and alloys reinforced with nanoparticles is a promising way to resol...
متن کاملCreep Deformation by Dislocation Movement in Waspaloy
Creep tests of the polycrystalline nickel alloy Waspaloy have been conducted at Swansea University, for varying stress conditions at 700 °C. Investigation through use of Transmission Electron Microscopy at Cambridge University has examined the dislocation networks formed under these conditions, with particular attention paid to comparing tests performed above and below the yield stress. This pa...
متن کاملDislocation jamming and andrade creep.
We simulate the glide motion of an assembly of interacting dislocations under the action of an external shear stress and show that the associated plastic creep relaxation follows Andrade's law. Our results indicate that Andrade creep in plastically deforming crystals involves the correlated motion of dislocation structures near a dynamic transition separating a flowing from a jammed phase. Simu...
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ژورنال
عنوان ژورنال: MRS Proceedings
سال: 1992
ISSN: 1946-4274
DOI: 10.1557/proc-288-861