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Origin of Widmanstatten Microstructure in Homogenized Ag-Sn Dental Alloys

Harsono Wirjosumarto, Richard S. Mateer

Data & Software Engineering Research Group
STEI-ITB, Jl. Ganeca No.10, Bandung 40132, Indonesia


Widmanstatten microstructures are often observed in Ag-Sn dental alloys, after they underwent slow cooling for homogenization temperature. This structure appears when the alloy contains silver or silver equivalent between 75 and 80 wt %.

Hatchet mark structure somewhat similar to Widmanstatten structure may be generated during the metallographic preparation of the specimens. These marks are actually mechanical twins resulted from the plastic deformation during the process of grinding and polishing.


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