【摘 要】
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Since Y has a great solid solubility in magnesium alloys,it helps enhancing the heat-resistant property of magnesium alloys.The effects of Y on microstructures
【机 构】
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School of Material Science and Engineering
论文部分内容阅读
Since Y has a great solid solubility in magnesium alloys,it helps enhancing the heat-resistant property of magnesium alloys.The effects of Y on microstructures and mechanical properties of Mg-6Al alloy have been studied in this work.The results show that Y addition refines grains of Mg-6Al alloy,and reduces the amount of the Mg17Al12 phase.At the same time,the high melting-point Al2Y phase particles are formed.According to the mathematical model of the two-dimensional lattice misfit proposed by Braffit,it is believed that the Al2Y particles can serve as the nucleation sites for α-Mg.After T6 treatment,both elongation and ultimate tensile strength of Mg-6Al alloy at the room temperature and high-temperature increased firstly and then decreased,with increasing Y addition.The peak mechanical properties were achieved in the Mg-6Al-1.2Y alloy system.Y addition appears to change the fracture characteristic of Mg-6Al alloy.With 1.2wt%Y,the fracture surface of the alloy showed a lot of dimples and tearing ridges which connected the microscopic dimples and the fracture is mixed fracture of quasi-cleavage and ductile fracture.
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