Creep Behavior of AZ91 Magnesium Alloy

Srinivasan, A and Ajithkumar, K K and Swaminathan, J and Pillai, U T S and Pai, B C (2013) Creep Behavior of AZ91 Magnesium Alloy. Procedia Engineering, 55 . pp. 109-113.

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Effects of intermetallic phases on the creep behavior of AZ91 magesium alloy have been studied. Thermally stable intermetallic phases such as Mg2Si and Mg3sb2 are introd-uced deliberately in AZ91 alloy by the adding Si and Sb (0.5% Si, 0.5% Sb and 0.5% Si+0.2% Sb, all are in wt%). Creep tests were carried out at 150 and 200oC with an initial stres of 50 MPa on the as cast samples. It is found that the B-Mg17Al12 intermetallic phase in the AZ91 alloy suffers sever cracking and facilities cavity forma-tion due to its low melting point and incoherency with Mg matrix, which results in poor creep resistance. On the other hand, the creep behavior of AZ91 alloy is greatly improved with the presence of Mg2Si and Mg3sb2 intermeta-llic phases because of their better thermal stabilities. These intermetallic phases strengthen the grain boundary against sliding and hence, reduce the possibility of void formations during creep. Furthermore, they also promote more number of continuous Mg17Al12 precipitates near the grain boundaries during creep, which in turn restricts the creep deformation

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:AZ91 Mg alloy; creep; intermetallic phases; continuous precipitates
Divisions:Material Science and Technology
ID Code:6591
Deposited By:Sahu A K
Deposited On:09 May 2013 14:08
Last Modified:09 May 2013 14:08
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