Microstructure-Properties: I Fracture Toughness - Materials Science ...
Microstructure-Properties: I Fracture Toughness - Materials Science ...
Microstructure-Properties: I Fracture Toughness - Materials Science ...
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27<br />
Objective<br />
Overview<br />
Crack<br />
Minimztn.<br />
Energy<br />
Absrptin.<br />
2A Transformation toughening:<br />
critical size of zirconia particles<br />
• An important consequence of the volume change on<br />
transformation is that it leads to an elastic driving force that<br />
opposes the transformation for particles embedded in a matrix<br />
of a different material.<br />
• Therefore we take advantage of having the zirconia<br />
embedded as small particles in the matrix of the ceramic to be<br />
toughened.<br />
• The particles must be small enough for the elastic energy term<br />
to be effective. The upper limit for retention of the high<br />
temperature (tetragonal) phase is ~ 0.5 µm.<br />
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