Title

Structure and properties of ultrafine-grained MOSi2+Si3N4 composites synthesized by mechanical alloying

Authors

Authors

C. Suryanarayana

Comments

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Abbreviated Journal Title

Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.

Keywords

MoSi2+Si3N4 composites; mechanical alloying; consolidation; X-ray; diffraction; transmission electron microscopy; microstructure; MOLYBDENUM DISILICIDE COMPOSITES; SILICON-NITRIDE CERAMICS; NANOCRYSTALLINE MATERIALS; NANOSTRUCTURED MATERIALS; SINTERING; ADDITIVES; FRACTURE-TOUGHNESS; MICROSTRUCTURE; MOSI2; SI3N4-MOSI2; BEHAVIOR; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

Abstract

Monolithic MoSi2 and MoSi2 + Si3N4 ultrafine-grained composites with 2.5 or 5.0 wt.% Si3N4 were synthesized by mechanical alloying. The microstructure and crystal structure of the phases present in the as-milled powders were determined by electron microscopy and X-ray diffraction methods. The mechanically alloyed powders were successfully consolidated to full density by vacuum hot pressing. A detailed microstructural investigation and mechanical properties (hardness and fracture toughness) evaluation of the consolidated products was presented. After consolidation, the microstructure continued to be fine-grained (in the submicron range), but no appreciable increase in the room temperature fracture toughness Of MoSi2 was observed for the composites by the addition of Si3N4. (c) 2007 Published by Elsevier B.V.

Journal Title

Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing

Volume

479

Issue/Number

1-2

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

23

Last Page

30

WOS Identifier

WOS:000255256300003

ISSN

0921-5093

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