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  • 1 Analytical Chemistry Division and Metals and Ceramics Division, Oak Ridge National Laboratory, 37830 Oak Ridge, Tennesse (USA)
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An ion microprobe has been used to identify silicon as the embrittling agent responsible for the tensile failure of a Pt-30Rh-8W alloy. Silicon was found to be segregated on the grain boundaries of the alloy, and to have a concentration gradient along them from the outer surfaces toward the interior of the sample.