Abstract
Nanocomposites were synthesized by the solid-state powder processing technique of mechanical alloying in Al-Al2O3, TiAl-Ti 5Si3, and MoSi2-Si3N4 systems. The mechanically alloyed powders were consolidated to full density by techniques such as vacuum hot pressing, hot isostatic pressing, and combinations of them. The as-milled powders as well as the consolidated compacts were characterized for their crystal structure features using X-ray diffraction and for the microstructural features using scanning and transmission electron microscopy techniques. Mechanical properties such as hardness, ductility, and fracture toughness were also measured. It has been shown that it is possible to produce a high volume fraction of the reinforcement of nanometer dimensions and that the properties of the nanocomposites are significantly better than those of the monolithic materials. Superplastic deformation has been demonstrated in TiAl-Ti5Si3 composite even when 60 vol.% of the ceramic reinforcement was present.
| Original language | English |
|---|---|
| Pages (from-to) | S229-S234 |
| Journal | Journal of Alloys and Compounds |
| Volume | 509 |
| Issue number | SUPPL. 1 |
| DOIs | |
| State | Published - 14 Jul 2011 |
Bibliographical note
Funding Information:The author is grateful to the National Science Foundation and Office of Naval Research for financial support. He also wishes to thank Professors Rüdiger Bormann, Thomas Klassen, Eugene Ivanov, Raj Vaidyanathan, and Linan An for collaborating on some of these projects and for useful discussions and to Mr. Balaji Prabhu and Ms. ThuyTien Nguyen for help in some of the experiments and analysis of results.
Keywords
- Mechanical alloying
- Mechanical properties
- Microstructure
- Nanocomposites
- Superplasticity
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry