稀土镁合金因其优异的室温及高温力学性能而具有广阔的发展前景,文中详细介绍了稀土镁合金中稀土元素在铸造性能、微观组织、力学性能和耐蚀性能方面的作用,以及Mg-Y和Mg-Gd两大主要稀土镁合金系的发展现状。重点分析了目前的研究热点之...稀土镁合金因其优异的室温及高温力学性能而具有广阔的发展前景,文中详细介绍了稀土镁合金中稀土元素在铸造性能、微观组织、力学性能和耐蚀性能方面的作用,以及Mg-Y和Mg-Gd两大主要稀土镁合金系的发展现状。重点分析了目前的研究热点之一:长周期有序结构LPSO(Long Period Stacking Ordered Structure),并针对Mg-Y(-RE)-Zn和Mg-Gd(-RE)-Zn两个合金系的研究现状进行了阐述;如何提高稀土镁合金的强度、韧性、高温性能和耐蚀性能等方面的同时,解决高成本制备和环境污染问题,建立健全一个绿色的稀土镁合金产业链仍需科研工作者的进一步努力研究。展开更多
In as-cast Mg?2.1Gd?1.1Y?0.82Zn?0.11Zr(mole fraction,%)alloy,lamellar microstructures that extend from grain boundaries to the interior ofα-Mg grains are identified as clusters ofγ′using a scanning transmission ele...In as-cast Mg?2.1Gd?1.1Y?0.82Zn?0.11Zr(mole fraction,%)alloy,lamellar microstructures that extend from grain boundaries to the interior ofα-Mg grains are identified as clusters ofγ′using a scanning transmission electron microscope equipped with a high-angle annular dark-field detector.Under a total strain-controlled low-cyclic loading at573K,the mechanical response and failure mechanism of Mg?2.1Gd?1.1Y?0.82Zn?0.11Zr alloy(T6peak-aging heat treatment)were investigated.Results show that the alloy exhibits cyclic softening response at diverse total strain amplitudes and573K.The experimental observations using scanning electron microscopy show that the micro-cracks initiate preferentially at the interface between long-period stacking order structures andα-Mg matrix and extend along the basal plane ofα-Mg.The massive long-period stacking order structures distributed at grain boundaries impede the transgranular propagation of cracks.展开更多
文摘稀土镁合金因其优异的室温及高温力学性能而具有广阔的发展前景,文中详细介绍了稀土镁合金中稀土元素在铸造性能、微观组织、力学性能和耐蚀性能方面的作用,以及Mg-Y和Mg-Gd两大主要稀土镁合金系的发展现状。重点分析了目前的研究热点之一:长周期有序结构LPSO(Long Period Stacking Ordered Structure),并针对Mg-Y(-RE)-Zn和Mg-Gd(-RE)-Zn两个合金系的研究现状进行了阐述;如何提高稀土镁合金的强度、韧性、高温性能和耐蚀性能等方面的同时,解决高成本制备和环境污染问题,建立健全一个绿色的稀土镁合金产业链仍需科研工作者的进一步努力研究。
基金Project(2015TP1035)supported by the Science and Technology Planning Project of Hunan Province,ChinaProject(531107040183)supported by the Fundamental Research Funds for the Central Universities,China
文摘In as-cast Mg?2.1Gd?1.1Y?0.82Zn?0.11Zr(mole fraction,%)alloy,lamellar microstructures that extend from grain boundaries to the interior ofα-Mg grains are identified as clusters ofγ′using a scanning transmission electron microscope equipped with a high-angle annular dark-field detector.Under a total strain-controlled low-cyclic loading at573K,the mechanical response and failure mechanism of Mg?2.1Gd?1.1Y?0.82Zn?0.11Zr alloy(T6peak-aging heat treatment)were investigated.Results show that the alloy exhibits cyclic softening response at diverse total strain amplitudes and573K.The experimental observations using scanning electron microscopy show that the micro-cracks initiate preferentially at the interface between long-period stacking order structures andα-Mg matrix and extend along the basal plane ofα-Mg.The massive long-period stacking order structures distributed at grain boundaries impede the transgranular propagation of cracks.
基金National Natural Science Foundation of China(51571044)National Key Research and Development Program of China(2016YFB0301102)Chongqing Foundation and Advanced Research Project(cstc2015jcyjBX0081)
