On the formation of intermetallic matrix composites produced by mechanical allo...

• Autor(es): Neves, F. ; Duarte, N. ; Trindade, B.
• Data: 2007
• Identificador Persistente: http://hdl.handle.net/10316/4203
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Ti-Al intermetallics; Mechanical alloying; Vapor deposition; Powder metallurgy; Mechanical properties
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

(Ti-48Al)-based intermetallics were synthesized by a combination of mechanical alloying, sputtering and hot isostatic pressure techniques. Blended elemental powders of TiH2 and Al with nominal composition TiH2-48Al were mechanically alloyed for different periods of time. The powders were then coated with Ti and Ag and subsequently hot isostatically pressed at 900 °C with a maximum pressure of 150 MPa for 2 h. Finally they were heat treated at 1200 °C for 4 h. After processing, the compacts obtained from the TiH2-48Al coated powders had a lower hardness but a higher Young's modulus and fracture-toughness than the uncoated compacts. Therefore, the combined used of mechanical alloying, sputtering and compaction techniques might be an alternative method for the synthesis of compacts with non-conventional microstructures, formed by surface modified intermetallic particles. http://www.sciencedirect.com/science/article/B6TWY-4M0BHF5-2/1/a82fc0ddb5840ac8097061402f5374d0