Abstract
Alloys containing 0.02 wt.% and 0.008 wt.% Bi in Cu were heat treated to produce a large grain size and to fail by intergranular fracture. Specimens were fractured in U.H.V. and individual grains on both fracture surfaces were analysed using Auger electron spectroscopy with a spatial resolution better than 260 μm. The results showed that, on the surfaces which gave good intercrystalline fracture: 1. (a) the Bi is strongly segregated within 1nm of the boundary and is uniformly spread over each boundary, 2. (b) the amount of segregation varies from boundary to boundary, and 3. (c) the segregated Bi is approximately equally divided between the two surfaces produced by the intergranular fracture.
Published Version
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