Diffusion-induced dislocations in RSP AlMo

✍ Scribed by C.P. Chang; M.H. Loretto

• Publisher: Elsevier Science
• Year: 1988
• Weight: 828 KB
• Volume: 36
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(88)90134-4

✦ Synopsis

Samples of melt-spun AL-MO alloys containing either 2.2 at.% MO or 0.7 at.% MO have been examined, using analytical electron microscopy, in the as-quenched state and after various annealing treatments. It has been found that in the alloys containing 2.2 at.% MO, dislocation networks are produced and Al,,Mo precipitates are formed during annealing, whereas although Al,,Mo is precipitated, in the more dilute 0.7 at.% MO alloy, no change. in dislocation density occurs. The dislocations in the 2.2 at.% MO samples separate regions of crystal, which still contain the supersaturated solid solution, from the regions where the MO has been removed from solution. Removal of the MO takes place only when the dislocations move by climb into the MO-rich regions. These observations are discussed in terms of the generation of dislocations during diffusion with particular emphasis on the role of coherent and partially coherent interfaces.