Mixed-mode (I and II) fracture behavior of a basal-textured magnesium alloy

Fracture mechanism and toughness of a rolled magnesium alloy under dynamic loading

“…Further confirmation that (the almost) equi-axed features such as those labeled as D, E, F (Fig.8(b)), I and H ( Fig.8(c)) are voids stems from the fact they seem to have been nucleated by fracture / debonding of inclusions (see, for example, E in Fig.8(b)). EDS analysis conducted here and in previous studies [3,20] show that these void nucleating particles in AZ31 Mg alloys are Fig.8(b)). Although there is a large scatter in the void sizes for each loading case, their average diameter is found to increase from 6 to 9 m as V 0 changes from 9 m/s to 20 m/s.…”

“…The specimens are machined such that RD is along its length and TD is along its width. Earlier studies [14,20] have shown that fracture specimens tested under quasi-static loading with the crack along RD and TD display negligible differences in response. A starter notch of diameter about 350 microns is first cut along the width using EDM to a length of 9.3 mm.…”

“…The fracture behaviour of Mg alloys under static loading has been extensively investigated [2,[11][12][13][14][15][16][17][18][19][20][21][22]. Somekawa et al [2,11,12] observed an increase in K IC and decrease in tensile twinning as grain size is refined, along with a change in fracture mechanism from twin-induced crack propagation to ductile void growth and coalescence.…”