The Structure and Composition of a Sigma approx = 9 Interface in a Mo(Re) Alloy via Transmission Electron and Atom-Probe Field-Ion Microscopies

The results of a combined classical transmission electron microscope (CTEM) and atom-probe field-ion microscope (APFIM) study of rhenium segregation at a grain boundary (GB), which is within approx = 0.40 of a Sigma = 9 coincidence-site lattice (CSL) orientation, in a Mo--5.4 at.% Re alloy is presen...

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Bibliographic Details
Published in:Scripta metallurgica 1989-12, Vol.23 (12), p.2033-2038
Main Authors: Hu, J G, Kuo, S-M, Seki, A, Krakauer, B W, Seidman, D N
Format: Article
Language:English
Online Access:Get full text
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Summary:The results of a combined classical transmission electron microscope (CTEM) and atom-probe field-ion microscope (APFIM) study of rhenium segregation at a grain boundary (GB), which is within approx = 0.40 of a Sigma = 9 coincidence-site lattice (CSL) orientation, in a Mo--5.4 at.% Re alloy is presented. The APFIM measurements show that the minimum Re concentration at this Gb is approx = 1.75 times greater than its concentration in the single-phase matrix. This demonstrates in a direct and quantitative manner that a high-angle GB with a small Sigma value ( approx = 9) exhibits segregation. A Mo--5.4 at.% Re alloy was recrystallized at 1773K and then heat treated a 1273K for 35 h to induce solute-atom segregation. The specimen was electropolished, backpolished and analyzed by APFIM and CTEM. The GB was chemically analyzed. Graphs, Photomicrographs. 12 ref.--A.R.
ISSN:0036-9748