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http://dx.doi.org/10.3740/MRSK.2002.12.4.248

Effect of Sn Addition on the Fatigue Properties of Al-Cu-Mn Cast Alloy  

Kim, Kyung-Hyun (Dept. of Material Eng., Korea Institute of Machinery and Materials)
Kim, Jeung-Dae (School of Materials Science and Engineeirng, Pusan National University)
Kim, In-Bae (School of Materials Science and Engineeirng, Pusan National University)
Publication Information
Korean Journal of Materials Research / v.12, no.4, 2002 , pp. 248-253 More about this Journal
Abstract
Effect of Sn addition on the fatigue properties of Al-Cu-Mn cast alloy was investigated by low and high cycle fatigue tests. Fatigue life showed the maximum value of 5450cycles in the Al-Cu-Mn alloy containing 0.10%Sn, but decreased rapidly beyond 0.20% of Sn additions. It was found that the fatigue strength was 132MPa and fatigue ratio was 0.31 in the alloy containing 0.10%Sn. Metallographic observation revealed that the fatigue crack initiated at the surface and propagated along the grain boundary. This propagation path was attributed to the presence of PFZ along the grain boundary. The tensile strength increased from 330MPa in 7he Sn-free Al-Cu-Mn cast alloy to 429MPa in the alloy containing 0.10%Sn. But above 0.20%Sn additions, tensile strength was decreased by the segregation of Sn.
Keywords
Al-Cu-Mn cast alloy; effect of Sn addition; fatigue life; fatigue strength; fatigue ratio; tensile strength;
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