Fatigue arrest marks

Fig. 7.52 Representative scanning electron micrographs of the nominally identical fracture-surface morphologies obtained in Mg-PSZ (MS grade) for a overload fracture under monotonic loads at AK 11.5 MPa and (b) fatigue fracture under cyclic loads at AK 6 MPa m. Note, in contrast to metals, the absence of striations or crack-arrest markings on the fatigue fracture surface. Arrow indicates general direction of crack growth [6]. With kind permission of John Wiley and Sons...

$Fig. 7.52 Representative scanning electron micrographs of the nominally identical fracture-surface morphologies obtained in Mg-PSZ (MS grade) for a overload fracture under monotonic loads at AK 11.5 MPa and (b) fatigue fracture under cyclic loads at AK 6 MPa m. Note, in contrast to metals, the absence of striations or crack-arrest markings on the fatigue fracture surface. Arrow indicates general direction of crack growth [6]. With kind permission of John Wiley and Sons...$

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