INVESTIGATION ON MECHANICALLY ALLOYED SUPERSATURATED NANOCRYSTALLINE Al-Ti ALLOYS

摘要

The Al_100-xTi_x（x=5,10,15,35） mixed powders were mechanically alloved in a planetaryball mill.It was found that the initial compositionstribgkt affects the final oridycts a nix-true of supersatureated solid solution Al（Ti）and a fcc phas for x=5 and 10;and a singlesupersaturated solid solution Al（Ti）for x=15 and 35.With increasing Ti contents from5at% to 35at%,the grain size of soild solution Al（Ti）deereased from 40mm to 10mm.Theresults suggest that fast diffusion along nanocrystalline grain boundary is the main alloyingProcess. DSCcurves and TEM observationindicate that the sokyte atom segregation canthermally stabilize the nanocrystalline solid solutions.