Melt treatment is well known to have an important influence on the properties of metallic glasses(MGs).However,for the MGs quenched from different melt temperatures with a quartz tube,the underlying physical origin re...Melt treatment is well known to have an important influence on the properties of metallic glasses(MGs).However,for the MGs quenched from different melt temperatures with a quartz tube,the underlying physical origin responsible for the variation of properties remains poorly understood.In the present work,we systematically studied the influence of melt treatment on the thermal properties of a Zr50Cu36Al14 glass-forming alloy and unveiled the microscopic origins.Specifically,we quenched the melt at different temperatures ranging from 1.1Tl to 1.5Tl(Tl is the liquidus temperature)to obtain melt-spun MG ribbons and investigated the variation of thermal properties of the MGs upon heating.We found that glass transition temperature,Tg,increases by as much as 36 K,and the supercooled liquid region disappears in the curve of differential scanning calorimetry when the melt is quenched at a high temperature up to 1.5Tl.The careful chemical analyses indicate that the change in glass transition behavior originates from the incorporation of oxygen and silicon in the molten alloys.The incorporated oxygen and silicon can both enhance the interactions between atoms,which renders the cooperative rearrangements of atoms difficult,and thus enhances the kinetic stability of the MGs.展开更多
研究结果表明 :微量的Mg和Si均能促进Al Ti C中间合金对工业纯铝和 60 63合金等铝合金的晶粒细化作用 ;在细化温度相同的条件下 ,与Si相比 ,Mg对Al Ti C中间合金细化效果具有更大的促进作用 ;微量的Mg可以抑制Al Ti C中间合金晶粒细化...研究结果表明 :微量的Mg和Si均能促进Al Ti C中间合金对工业纯铝和 60 63合金等铝合金的晶粒细化作用 ;在细化温度相同的条件下 ,与Si相比 ,Mg对Al Ti C中间合金细化效果具有更大的促进作用 ;微量的Mg可以抑制Al Ti C中间合金晶粒细化的“温度效应” ;铝熔体中同时存在微量的Mg和Si时Al Ti C中间合金的细化效果更好。初步探讨了这两种微量元素促进Al Ti C中间合金细化效果的机理。展开更多
Heredity of microstructure in AlTiC master alloy, grain refiners, was analyzed. It is found that, for morphologies and distributions of TiC particles, there are visible heredity which originates from raw materials or ...Heredity of microstructure in AlTiC master alloy, grain refiners, was analyzed. It is found that, for morphologies and distributions of TiC particles, there are visible heredity which originates from raw materials or processing methods of Al melt, and will ultimately be transferred to the solid state structure through the melt stage, and this phenomenon can cause hereditary influences on refinement: formation of chain like TiC morphology results in rapid refinement fading behavior; distribution of TiC along grain boundaries greatly reduces refinement efficiency. Controlling of structural heredity through proper selections of raw materials and processing parameters is of great importance in obtaining ideal microstructures and improving refinement behaviors of AlTiC master alloys.展开更多
基金The work was financially supported by the National Key Research and Development Program of China(Grant Nos.2018YFA0703600,2021YFA0716302,and 2021YFA0718703)the National Natural Science Foundation of China(Grant Nos.51825104 and 52192602)China Postdoctoral Science Foundation(Grant No.2022T150691).
文摘Melt treatment is well known to have an important influence on the properties of metallic glasses(MGs).However,for the MGs quenched from different melt temperatures with a quartz tube,the underlying physical origin responsible for the variation of properties remains poorly understood.In the present work,we systematically studied the influence of melt treatment on the thermal properties of a Zr50Cu36Al14 glass-forming alloy and unveiled the microscopic origins.Specifically,we quenched the melt at different temperatures ranging from 1.1Tl to 1.5Tl(Tl is the liquidus temperature)to obtain melt-spun MG ribbons and investigated the variation of thermal properties of the MGs upon heating.We found that glass transition temperature,Tg,increases by as much as 36 K,and the supercooled liquid region disappears in the curve of differential scanning calorimetry when the melt is quenched at a high temperature up to 1.5Tl.The careful chemical analyses indicate that the change in glass transition behavior originates from the incorporation of oxygen and silicon in the molten alloys.The incorporated oxygen and silicon can both enhance the interactions between atoms,which renders the cooperative rearrangements of atoms difficult,and thus enhances the kinetic stability of the MGs.
文摘研究结果表明 :微量的Mg和Si均能促进Al Ti C中间合金对工业纯铝和 60 63合金等铝合金的晶粒细化作用 ;在细化温度相同的条件下 ,与Si相比 ,Mg对Al Ti C中间合金细化效果具有更大的促进作用 ;微量的Mg可以抑制Al Ti C中间合金晶粒细化的“温度效应” ;铝熔体中同时存在微量的Mg和Si时Al Ti C中间合金的细化效果更好。初步探讨了这两种微量元素促进Al Ti C中间合金细化效果的机理。
文摘Heredity of microstructure in AlTiC master alloy, grain refiners, was analyzed. It is found that, for morphologies and distributions of TiC particles, there are visible heredity which originates from raw materials or processing methods of Al melt, and will ultimately be transferred to the solid state structure through the melt stage, and this phenomenon can cause hereditary influences on refinement: formation of chain like TiC morphology results in rapid refinement fading behavior; distribution of TiC along grain boundaries greatly reduces refinement efficiency. Controlling of structural heredity through proper selections of raw materials and processing parameters is of great importance in obtaining ideal microstructures and improving refinement behaviors of AlTiC master alloys.
基金supported by the National Key Research and Development Program of China(2018YFA0703600 and 2021YFA0718703)the National Natural Science Foundation of China(51825104,52192602 and T2222028)the CAS Projects(2022007 and XDB30000000)。
基金supported by the National Key Research and Development Program of China (2018YFA0703600)the National Science Fund for Distinguished Young Scholars (51825104)+3 种基金the Key Research Program of Frontier Sciences of Chinese Academy of Sciences (QYZDY-SSW-JSC017)the Strategic Priority Research Program of Chinese Academy of Sciences (XDB30000000)the Key Basic and Applied Research Program of Guangdong Province, China (2019B030302010)the National Natural Science Foundation of China (11790291 and 61888102)。
基金supported by the National Key Research and Development Plan(2018YFA0703603)Guangdong Major Project of Basic and Applied Basic Research,China(2019B030302010)+1 种基金the National Natural Science Foundation of China(51822107,11790291 and 61888102)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB30000000)。
基金the National Key Research and Development Program of China(2018YFA0703600 and2017YFB0701900)the National Natural Science Foundation of China(51825104,51801095,11790291 and 61888102)+1 种基金CAS projects(XDB30000000)the Key Basic and Applied Research Program of Guangdong Province of China(2019B030302010)。
