艾利特超级镁合金(Allite Super Magnesium)是一种高强度镁合金,是美国艾利特公司研发的,过去仅用于国防军工和航空航天领域,现在它的价格有所下降,成为一种高强度的比铝轻得多的价格较为合理的镁合金,开始在其他领域应用。它有三种型号...艾利特超级镁合金(Allite Super Magnesium)是一种高强度镁合金,是美国艾利特公司研发的,过去仅用于国防军工和航空航天领域,现在它的价格有所下降,成为一种高强度的比铝轻得多的价格较为合理的镁合金,开始在其他领域应用。它有三种型号:AE81、ZE62、WE54,各具特色,强度也各异,但都具有高的抗蚀性、抗疲劳性能和耐磨性,还有优秀的硬度和电学性能。展开更多
美耗时15年突破中国技术封锁研制出氟代硼铍酸钾晶体2016年2月,美国先进光学晶体(A P C)公司网站发布声明,宣布该公司与克莱门森大学合作,用15年的时间终于研制出氟代硼铍酸钾晶体(K B B F),这种激光晶体能够用于制造深紫外激光器。声...美耗时15年突破中国技术封锁研制出氟代硼铍酸钾晶体2016年2月,美国先进光学晶体(A P C)公司网站发布声明,宣布该公司与克莱门森大学合作,用15年的时间终于研制出氟代硼铍酸钾晶体(K B B F),这种激光晶体能够用于制造深紫外激光器。声明中说,2009年中国开始禁止向国外提供这种具有战略意义的晶体。该公司声明称。展开更多
The fracture behavior of a permanent mould casting Mg-8.57Gd-3.72Y-0.54Zr(mass fraction,%)(GW94) alloy was investigated under different thermal conditions,including as-cast,solution-treated,peak-aged,and over-aged sta...The fracture behavior of a permanent mould casting Mg-8.57Gd-3.72Y-0.54Zr(mass fraction,%)(GW94) alloy was investigated under different thermal conditions,including as-cast,solution-treated,peak-aged,and over-aged states.Scanning electron microscopy(SEM) and optical microscopy(OM) were employed to examine the crack nucleation and fracture model.The results indicate that the GW94 alloy shows different behaviors of crack initiation and fracture under different thermal conditions. During tensile test at room temperature,the fracture model of the as-cast GW94 alloy is quasi-cleavage,while that of the solution-treated alloy is transgranular cleavage.It is a mixed pattern of transgranular and intergranular fracture for both the aged conditions.Large cavities formed at grain boundaries are observed in the peak-aged sample tested at 300℃,corresponding to the intergranular fracture.Localized plastic deformation at grain boundaries is also observed and corresponds to the high elongation at 300℃.展开更多
文摘艾利特超级镁合金(Allite Super Magnesium)是一种高强度镁合金,是美国艾利特公司研发的,过去仅用于国防军工和航空航天领域,现在它的价格有所下降,成为一种高强度的比铝轻得多的价格较为合理的镁合金,开始在其他领域应用。它有三种型号:AE81、ZE62、WE54,各具特色,强度也各异,但都具有高的抗蚀性、抗疲劳性能和耐磨性,还有优秀的硬度和电学性能。
文摘美耗时15年突破中国技术封锁研制出氟代硼铍酸钾晶体2016年2月,美国先进光学晶体(A P C)公司网站发布声明,宣布该公司与克莱门森大学合作,用15年的时间终于研制出氟代硼铍酸钾晶体(K B B F),这种激光晶体能够用于制造深紫外激光器。声明中说,2009年中国开始禁止向国外提供这种具有战略意义的晶体。该公司声明称。
基金Project(2007CB613704) supported by the National Basic Research Program of China
文摘The fracture behavior of a permanent mould casting Mg-8.57Gd-3.72Y-0.54Zr(mass fraction,%)(GW94) alloy was investigated under different thermal conditions,including as-cast,solution-treated,peak-aged,and over-aged states.Scanning electron microscopy(SEM) and optical microscopy(OM) were employed to examine the crack nucleation and fracture model.The results indicate that the GW94 alloy shows different behaviors of crack initiation and fracture under different thermal conditions. During tensile test at room temperature,the fracture model of the as-cast GW94 alloy is quasi-cleavage,while that of the solution-treated alloy is transgranular cleavage.It is a mixed pattern of transgranular and intergranular fracture for both the aged conditions.Large cavities formed at grain boundaries are observed in the peak-aged sample tested at 300℃,corresponding to the intergranular fracture.Localized plastic deformation at grain boundaries is also observed and corresponds to the high elongation at 300℃.
