ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mechanical properties of AZ91 cast alloy depend strongly on the morphology (size anddistribution) of the second (β-Mg17Al12) phase. It was observed that low ductility of AZ91 alloy wasattributed to the brittle nature of the β phase particles at which microcracks initiated. Thesemicrocracks then coalesced contributing to the fracture of alloy. Quantitative study on microcrackingprogress revealed that cast samples with coarse microstructures fractured at low strain due to thenon-uniform distribution of bulk blocky β particles at interdendrite region. These fracture surfacesexhibited clear cleavage mode. Fine cast microstructure presented quasicleavage fracture mode withclear dimple and tear ridges. The partial melting (and resolidification) heat treatment improved tensileproperties, which was in disagreement with the available data from literature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.65.pdf
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