Paper Title:
Effects of Microstructure and Partial Melting on Tensile Properties of AZ91 Magnesium Cast Alloy
  Abstract

Mechanical properties of AZ91 cast alloy depend strongly on the morphology (size and distribution) of the second (β-Mg17Al12) phase. It was observed that low ductility of AZ91 alloy was attributed to the brittle nature of the β phase particles at which microcracks initiated. These microcracks then coalesced contributing to the fracture of alloy. Quantitative study on microcracking progress revealed that cast samples with coarse microstructures fractured at low strain due to the non-uniform distribution of bulk blocky β particles at interdendrite region. These fracture surfaces exhibited clear cleavage mode. Fine cast microstructure presented quasicleavage fracture mode with clear dimple and tear ridges. The partial melting (and resolidification) heat treatment improved tensile properties, which was in disagreement with the available data from literature.

  Info
Periodical
Materials Science Forum (Volumes 546-549)
Edited by
Yafang Han et al.
Pages
65-68
DOI
10.4028/www.scientific.net/MSF.546-549.65
Citation
T. P. Zhu, Z. W. Chen, W. Gao, "Effects of Microstructure and Partial Melting on Tensile Properties of AZ91 Magnesium Cast Alloy", Materials Science Forum, Vols. 546-549, pp. 65-68, 2007
Online since
May 2007
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Price
$32.00
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