The following picture shows the microstructure of Al 2 O 3 . The scale bar is 5 microns. By which thermal process is the mechanical properties, eg. toughness, improved?

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The following picture shows the microstructure of Al₂O₃. The scale bar is 5 microns.

Crystal structure of Al2O3

By which thermal process is the mechanical properties, eg. toughness, improved?

quenching

tempering

sintering

50%

annealing

50%

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