Effect of aging treatment on fracture toughness in ZM61 magnesium alloy |
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Authors: | D. L. Yu D. Z. Zhao G. S. Hu F. S. Pan |
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Affiliation: | 1. College of Materials Science and EngineeringChongqing University, Chongqing 400045, China;2. National Engineering Research Center for Magnesium AlloysChongqing University, Chongqing 400044, China |
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Abstract: | The effect of aging treatment on fracture toughness in Mg–6Zn–1Mn (wt-%) was investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, uniaxial tensile and fracture toughness tests, respectively. The results showed that the fracture toughness of Mg–6Zn–1Mn alloy can be enhanced by aging treatment. The fracture toughness and strength showed a reverse trend in single aged and double aged alloy. Synergetic effect of fine grains and precipitates improved the fracture toughness more sharply than aging treatment. The precipitate free zones and grain boundary precipitates made the largest contribution to the reduction of toughness. Under as extruded and aged conditions, the main origins of cracks were elastic incompatibility and plastic deformation. |
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Keywords: | Magnesium alloy Fracture toughness Precipitates Fracture mechanism |
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