Dispersion hardening

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The precipitation hardening is a precipitation with particles (mostly oxides) that are up to the melt of the material stable. The hardening takes place in that the introduced particles have to be bypassed by the dislocations . Dispersion hardening is used today in the field of high-temperature materials.

It is characterized by its low surface energy, which means that the precipitates are distributed flatly around the grain boundary. The carbides , metal-carbon compounds, which are finely distributed at the grain boundary and prevent grain boundary slip, are of practical relevance . The low surface energy leads to a high temperature resistance, which is crucial for superalloys .