SEMINAR: CMCA Seminar Series: Time lapse imaging of gold microstructure development
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CMCA Seminar Series: Time lapse imaging of gold microstructure development |
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Dr Rob Hough, a research scientist with CSIRO Earth Science and Resource Engineering will present latest techniques used to study the properties of gold that have previously been overlooked, ignored or were not known to have existed.
Natural gold accumulations that occur as nuggets (Au/Ag alloy) have previously been chemically etched to reveal an internal polycrystalline structure that is diagnostic of having been thermally annealed. Quantitative microstructural analyses using EBSD identified the grain boundaries and twin planes developed during this recrystallisation process in the gold.
We have now performed experiments on manufactured Au/Ag alloys to replicate the natural environment using step-wise heating and concomitant rapid EBSD map collection, to both image and analyse the microstructural development. The experiments were only possible because alloys were first treated by large area ion beam polishing (LEICA RES 101). This process removed the deformed beilby layer at the uppermost surface of the gold and allowed us to collect high quality EBSD data. This type of preparation will now allow us to study the microstructure of fine grained gold even when it occurs in a matrix of other minerals.
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