卓海鸥
,
唐建成
,
叶楠
稀有金属材料与工程
通过力学性能测试和TEM观察,对液相原位反应法制备的Cu-0.9Y2O3(体积分数,％)复合材料的凝固机理和强化机制进行研究.结果表明:在液相线温度上,熔融的Cu-Y合金在等温凝固的条件下,原位生成的纳米级Y2O3粒子均匀弥散分布在铜基体上,并没有在晶界附近聚集长大;通过不同强化机制定量计算Cu-0.9Y2O3复合材料的抗拉强度为593 MPa,与实测值568MPa相当,其中,Orowan机制和切割机制作为主要的强化机制是共同存在的,其产生的强度增值分别为174和207MPa,晶界强化作为辅助强化机制对材料的强度也有贡献.
关键词:
Cu-Y2O3复合材料
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液相原位反应
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凝固机理
,
强化机制
魏丽颖
,
刘姚君
,
汪澜
,
颜碧兰
硅酸盐通报
综述了水泥工业处置废弃物过程中常见的几种重金属元素(Cr、Cu、Zn、Pb、Cd)在水泥熟料矿物中的固溶机理.一些重金属离子更容易固溶进入硅酸盐矿物,一些重金属离子更容易固溶进入中间相矿物,并因固溶量的不同而稳定不同的矿物晶型,超过极限固溶量时形成新的矿物.重金属离子在水泥熟料矿物相中的固溶方式和极限固溶量都与其矿物相的晶体结构有关.应进行深入研究,以便于水泥工业无害化利用产业废弃物.
关键词:
重金属
,
熟料矿物
,
晶型
,
固溶机理
J.F. Li
,
G.C. Yang and Y.H. Zhou(State Key Laboratory of Solidification Processing
,
Northwestern Polytechnical University
,
Xi'an 710072
,
China)
金属学报(英文版)
The solidification behavior of bulk undercooled Ni50Cu50 alloy was systematically investigated. Double recalescences were discovered for the first time in a single phase Ni-Cd alloy, in which there is no solid phase transition at elevated temperature. When the alloy melt was undercoolcd below the solidus temperature, the effect of nonequilibrium solidification could make the solid with the norminal composition C0 of the alloy nucleate and grow till tempemture approached To (the temperuture at which the free enengies of solid and liquid with C0 are equal). Following it, the nucleation and growth of the solid with more high melting point component were required, so the secondary recalescence took place. The concentration distribution in crystals was also analysed.
关键词:
undercooled Ni-Cu alloy
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null
,
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