Journal of Materials Science and Engineering with Advanced TechnologyAuthor's: Chunfei Li, Lidong Wang, Limin Wang and David B. Williams
Pages: [29] - [39]
Received Date: November 10, 2010
Submitted by:
In the present work, we used Cu-Sb alloy system as a model to study
grain boundary segregation in specimens prepared by rapid quenching.
Ribbons of Cu-Sb alloys of single Cu phase and polycrystalline
structure containing 0.01, 0.08, and 
Sb prepared by single roller melt spinning
were used as specimens, and the segregation was studied by using
energy dispersive X-ray spectrometer attached to a scanning
transmission electron microscope. Sb grain boundary segregation was
detected in the 0.08 and Sb specimens and the degree of segregation
in the 
Sb specimen is below detection limit. The
effect of rapid quenching in suppressing the segregation was confirmed
by comparing the results of as- quenched and annealed Sb specimens. It is reasoned that the
degree of grain boundary segregation increases with Sb concentration
from zero up to a value larger than 
in the present alloy series. Further, it is
concluded that the segregation happens at temperatures above 873K.
Upon comparing with previous reports, it is concluded that the degrees
of Sb grain boundary segregation observed in the as-quenched
Sb specimen have little effect on the
alloys performance in impact test. The present work provides a basis
of consideration when both annealing and segregation are concerned in
alloy processing.
segregation, melt spinning, analytical electron microscopy, grain boundaries.
