Evaluation of mechanical properties of partially amorphous and nanocrystalline Al50Ti40Si10 composites prepared by mechanical alloying and hot isostatic pressing

Mechanically alloyed in situ nano Al3Ti dispersed Al50T40Si10 amorphous matrix alloy powder was consolidated by hot isostatic pressing in the temperature range of 300-600 degrees C with a pressure of 1.2 GPa and holed at this temperature for 10 min. Microstructural and phase evolution studies of the mechanically alloyed powder and sintered compacts were conducted by X-ray diffraction and transmission electron microscopy. Alloy sintered at 500 degrees C recorded an excellent combination of high hardness(8.61 GPa), compressive strength (1212 MPa) and Young's modulus (149 GPa). Furthermore, these results have been compared with that of earlier studies based on conventional sintering (CCS), and high pressure sintering (HPS). (c) 2012 Elsevier B.V. All rights reserved