The micro structures and fracture toughness properties of the aged Al-12.5Si-0.7Mg alloy plate were studied by transmission electron microscopy(TEM),optical microscopy(OM),tensile,and fracture toughness(the fracture t...The micro structures and fracture toughness properties of the aged Al-12.5Si-0.7Mg alloy plate were studied by transmission electron microscopy(TEM),optical microscopy(OM),tensile,and fracture toughness(the fracture toughness value,K_(IC))testing.The mechanism of fracture toughness properties of the alloys was discussed for different sizes of silicon particle and aging precipitates.The results show that the refined and rounded silicon particles will improve the fracture toughness property of the alloys.However,the silicon particles size is no longer the main factor to affect the fracture toughness property when the silicon particles are small and they have no sharp corners.The morphology and distribution of the precipitates play an important role in the fracture toughness property of the aged alloys.Their fracture toughness decreases gradually as the aging time increases.展开更多
基金financially supported by the High Technology Research and Development Program of China(No.2008AA030701)the National Natural Science Foundation of China(No.50734006)。
文摘The micro structures and fracture toughness properties of the aged Al-12.5Si-0.7Mg alloy plate were studied by transmission electron microscopy(TEM),optical microscopy(OM),tensile,and fracture toughness(the fracture toughness value,K_(IC))testing.The mechanism of fracture toughness properties of the alloys was discussed for different sizes of silicon particle and aging precipitates.The results show that the refined and rounded silicon particles will improve the fracture toughness property of the alloys.However,the silicon particles size is no longer the main factor to affect the fracture toughness property when the silicon particles are small and they have no sharp corners.The morphology and distribution of the precipitates play an important role in the fracture toughness property of the aged alloys.Their fracture toughness decreases gradually as the aging time increases.
