Fatigue Behavior of Thixomolded^®Magnesium AZ91D Using Ultrasonic Techniques

Cyclic Deformation of Semi-solid Processed Magnesium Alloys

“…Other LCF behavior on the heat treated AZ91 die cast alloy was also reported in [33][34][35][36]. Limited studies on the stress-controlled high cycle fatigue of thixomolded AZ91 alloy [37,38] and other thixomolded Mg alloys [39] indicated that the fatigue limit was significantly higher than that of the die cast counterparts. To the author's knowledge, no strain-controlled low cycle fatigue (LCF) resistance of the thixomolded AZ91D and AM60B alloys has been reported so far.…”

“…In addition, again the fatigue data of the thixomolded AM60B alloy exhibited a relatively smaller experimental scatter due to a smaller amount of porosity present in the thixomolded alloy as reported in Table 4.1. Moore et al [37] also reported a longer fatigue life of the thixomolded AZ91D alloy than that of the vacural (gravity) die cast counterpart at a given stress level in their stress-controlled high cycle fatigue tests.…”

“…The effect of two different HPDC manufacturing processes on microstructure, tensile and fatigue properties of Mg alloy AM60 was investigated by Kang and Ostrom [86]. Some limited studies on fatigue behaviour of thixomolded AZ91 alloy [37,38] has shown substantial higher fatigue of these alloys compared to its die cast counterparts.…”

“…Moore et al [37] also reported that the fatigue behavior was primarily a factor of the size and distribution of the porosity within the specimen, and less a factor of the microstructural constituents when comparing S-N curves between the thixomolded and Vacural (gravity) die cast AZ91 alloys, with the former showing a higher fatigue limit.…”