Issue 53

A. Grygu ć et alii, Frattura ed Integrità Strutturale, 53 (2020) 152-165; DOI: 10.3221/IGF-ESIS.53.13

The final fracture zone surface morphology is shown in Fig. 12(b, d). The as-extruded material Fig. 12(b) shows some evidence of ductility as well as an intergranular fracture morphology with a faceted structure. The forged sample Fig. 12(d) showed much more evidence of ductility with a very pronounced dimpled surface morphology and terrace like structure supporting the observation of more plastic fracture behaviour.

Figure 9: SEMmicrographs showing the overall tensile fracture surface of the AZ31B extruded samples (a); forged at rate of 3.9 mm/min and a temperature of (b) 300°C (c) 400°C and (d) 450° C, and (e) forging rate of 39 mm/min at a temperature of 400° C Note: the enclosed areas are magnified in Fig. 10.

Figure 10: The corresponding SEM micrographs showing morphology (enclosed in Fig. 9) of the tensile fracture surface of the AZ31B extruded samples (a); forged at rate of 3.9 mm/min and a temperature of (b) 300°C (c) 400° C and (d) 450° C, and (e) forging rate of 39 mm/min at a temperature of 400° C.

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