LI Douxing PING Dehai NING Xiaoguang YE Hengqiang Laboratory of Atomic Imaging of Solids
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Institute of Metal Research
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Academia Sinica
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Shenyang.China Professor
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Institute of Metal Research
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Academia Sinica
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Shenyang 110015
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China
金属学报(英文版)
The characteristic of interface depending on the atomic structure exerts an inportant,and sometime controlling,influence on performance of the interacial materials. The present paper reviews the main studies on fine structure of both the materials inter- faces and interfacial reaction products in semiconductor uperlattice,metal multilayer ceram- ics and composite materials by mean of selected area electron doffraction patterns and high resolution electron microscopy. The following features of interfaces are reviewed:the orientation relationships;the char- acteristic of steps,facets and ronghness of interfaces;atomic bonding across the interface;the degree of coherency,the structure of misfit dislocations and elastic relaxations at the inter- faces:the presence of defects at the onterfaces:the structure of the interfacial reaction prod- ucts as well as the reaction kinetics and reaetion mechanism.
关键词:
fine structure of the interfaces
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null
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null
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null
张占领
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柳永宁
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张柯柯
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孙俊杰
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夏琦
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高莉华
材料热处理学报
研究了含C量1.6%超高碳钢不同淬火条件下马氏体的形貌及其亚结构.结果表明,超高碳钢淬火组织随奥氏体化温度变化而发生显著变化.奥氏体化温度较高时形成粗大孪晶马氏体;奥氏体化温度较低时淬火组织为位错亚结构的板条马氏体、枣核状马氏体和少量孪晶马氏体,以及未溶碳化物.高分辨电镜观察表明,三维形态像枣核状的马氏体的亚结构为高密度位错.这是由于奥氏体化时碳化物分解比铁索体向奥氏体转变慢;碳化物分解过程中在碳化物原位形成位错堆积;淬火时马氏体优先在位错堆积处形核,并以位错滑移机制长大、增厚,最终形成板条马氏体或枣核状马氏体.
关键词:
超高碳钢
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马氏体相变
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高分辨电镜
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位错
王明光
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祁阳
功能材料
利用透射电子显微镜研究了衬底温度600～800℃条件下采用脉冲激光法在（001）LaAlO3（LAO）衬底上制备的La0.7Ca0.3MnO3（LCMO）薄膜的微观结构。结果表明薄膜由大量柱状晶组成且与LAO衬底形成良好外延关系。LCMO薄膜与LAO衬底的取向关系可以描述为：（ⅰ）（100）f∥（001）s、[011]f∥[100]s;（ⅱ）（011）f∥（001）s、[100]f∥[100]s。LCMO显示层状畴结构,即在衬底上初始生长的薄膜为（ⅱ）型畴,在此之上生长的薄膜为（ⅰ）类和（ⅱ）类型畴的混合体。薄膜中可观察到一些反向畴与孪晶等缺陷。薄膜与衬底界面少见错配位错,薄膜以Stranski-Krastanov模式生长。
关键词:
高分辨电子显微术
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取向畴
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孪晶
