Effect of position on the tensile properties in high-pressure die cast Mg alloy

Micro–macro interactions and effect of section thickness of hpdc AZ91 Mg alloy

“…It is concluded that AZ91 follows intergranular brittle failure and, cleavage and quasi-cleavage are the most common fracture modes [16]. The crack initiation and growth from shrinkage pores, damage of brittle ␤ particles and grain boundary cleavage are found to be the primary failure modes of the present material from the in situ tensile analysis [16].…”

“…5. The predominant intergranular failure of hpdc AZ91 alloy is also due to the arrangement of shrinkage pores and ␤ particles in the intergranular region [16]. The effect of inclusion on fracture was found to be negligible due to its scarce presence in this material.…”

“…This exactly reflects from the results of thick castings where high clustering nature of pores and ␤ particles strongly reduces the values of FS by early failure. ␤ particles not only supports the fracture process by getting itself damaged [16] but also increases the strength of hpdc AZ91 alloy by the arrangement of high density of finer ␤ in the rim region.…”

“…In addition, Yoo et al [18] documented that damages in massive ␤-phase in the grain boundaries supports the grain boundary fracture. The different failure modes of hpdc AZ91 alloy under tensile loading and the extent effect of shrinkage pores and ␤ particles on failure are explained in the previous contribution of authors [16]. The microstructural damages or cracks have strong effect on the macrobehavior of the material [19][20][21].…”

Relationship Between the Tensile Properties, Microstructures, and the Macrostructure of the Investment Complex-Shaped Casting

“…Great differences in grain size and microstructure exist in casting because of the bifilm unfurling and bifilm distribution, which play a significant role in mechanical properties. D.G.Leo Prakash et al reported that even for a simple casting, tensile properties were sensitive to the position o f the casting because o f the difference in grain size, microporosity and other solidification characteristics [12]. In a similar investigation, A.M.Gokhale also found variability in properties of castings with the same process, parameters and chemical composition [13].…”