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Chen G.,Chongqing University of Science and Technology | Chen G.,Chongqing University | Peng X.-D.,Chongqing University | Peng X.-D.,National Engineering Research Center for Magnesium Alloy | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Effects of extrusion process parameters (extrusion temperature, extrusion ratio) on microstructure and performance of Mg-Sr-Y alloy were studied. The results indicate that the as-cast microstructure of Mg-Sr-Y alloy is composed of dendritic matrix phase α-Mg and network eutectic (Mg 17Sr 2, Mg 25Y 4) distributed along grain boundaries. After hot extrusion, the alloy grains are refined significantly, the network autectic and dendrite structure is broken up, and grain size and distribution of the second phase of alloy are more uniform. Meanwhile, hardness of the alloy significantly increases, and the mechanical properties are improved obviously due to strain hardening effect. The effect of strengthening depends on extrusion temperature and extrusion ratio. The higher the extrusion temperature and the larger extrusion ratio, the strengthening effect is more significant. Source


Chen G.,Chongqing University of Science and Technology | Chen G.,Chongqing University | Peng X.-D.,Chongqing University | Peng X.-D.,National Engineering Research Center for Magnesium Alloy | And 6 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011

The effects of Sr and Y with different contents on the microstructure and corrosion resistance of AZ31 alloy were investigated. The results indicate that the addition of Sr can obviously reduce the grain size of AZ31 alloy and transform β-Mg17Al12 phase from continuous network to scattered form. Simultaneously, Al4Sr phase distributed along the boundaries of grains is formed in AZ31-Sr magnesium alloys. The addition of Sr is not as effective as the simultaneous addition of Sr+Y for the refinement of grains, and Al2Y and Al3Y phases are distributed both in intracrystalline and along grain boundaries. The corrosion resistance is improved slightly in AZ31 alloy with simultaneous addition of 0.5Sr+Y. Due to its smallest corrosion current density and corrosion rate, the corrosion resistance of AZ31-0.5Sr-1.5Y magnesium alloy is proved the best. © 2011 The Nonferrous Metals Society of China. Source


Chen G.,Chongqing University of Science and Technology | Chen G.,Chongqing University | Peng X.-D.,Chongqing University | Peng X.-D.,National Engineering Research Center for Magnesium Alloy | And 5 more authors.
Chinese Rare Earths | Year: 2013

Effects of solid solution treatment on microstructure and mechanical properties of Mg-10Sr-5Y master alloys were studied. The results indicate that solid solution treatment can modify the microstructure and improve mechanical properties of Mg-10Sr-5Y alloys. The intermetallic compounds, such as Mg17Sr2 and Mg24Y5 distrubited along the grain boundary, dissolve into matrix α-Mg gradually. The structure distrubites more uniformly with the solid solution temperature increasing. A little und-isolved Mg17Sr2 and Mg24Y5 eutectic compounds distrubite on the grain boundary after solid solution treatment. When the temperature of solid solution is lower than 480°C, the hardness decreases slightly with increasing solution treatment temperature. When the temperature is more than 480°C, the hardness decreases sharply and then increases with temperature increasing, the minimum hardness is obtained at 500°C. The effect of holding time on the hardness of Mg-10Sr-5Y alloys is very little. Source

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