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Search Results: 1 - 10 of 20946 matches for " 界面晶粒生长 "
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Theory of abnormal grain growth in thin films and analysis of energy anisotropy
薄膜中异常晶粒生长理论及能量各向异性分析

Zhang Jian-Min,Xu Ke-Wei,Zhang Mei-Rong,
张建民
,徐可为,张美荣

物理学报 , 2003,
Abstract: A theoretical model is proposed for the abnormal grain growth in thin films of columnar grains. In addition to the grain boundary energy usually considered for the grain growth in bulk materials, the influences of surface energy, interface energy and strain energy are also considered in the model. A reviewed analysis is given out for the anisotropy of energy. For fcc- and bcc- metal films, surface energy minimization generally favours (111) and (110) textures, while strain energy minimization generally favours (110) and (100) textures.
Nickel-disilicide-assisted excimer laser crystallization of amorphous silicon
Liao Yan-Ping,Shao Xi-Bin,Gao Feng-Li,Luo Wen-Sheng,Wu Yuan,Fu Guo-Zhu,Jing Hai,Ma Kai,
廖燕平
,邵喜斌,郜峰利,骆文生,吴 渊,付国柱,荆 海,马 凯

中国物理 B , 2006,
Abstract: Polycrystalline silicon (poly-Si) thin film has been prepared by means of nickel-disilicide (NiSi$_{2})$ assisted excimer laser crystallization (ELC). The process to prepare a sample includes two steps. One step consists of the formation of NiSi$_{2}$ precipitates by heat-treating the dehydrogenated amorphous silicon (a-Si) coated with a thin layer of Ni. And the other step consists of the formation of poly-Si grains by means of ELC. According to the test results of scanning electron microscopy (SEM), another grain growth model named two-interface grain growth has been proposed to contrast with the conventional Ni-metal-induced lateral crystallization (Ni-MILC) model and the ELC model. That is, an additional grain growth interface other than that in conventional ELC is formed, which consists of NiSi$_{2}$ precipitates and a-Si. The processes for grain growth according to various excimer laser energy densities delivered to the a-Si film have been discussed. It is discovered that grains with needle shape and most of a uniform orientation are formed which grow up with NiSi$_{2}$ precipitates as seeds. The reason for the formation of such grains which are different from that of Ni-MILC without migration of Ni atoms is not clear. Our model and analysis point out a method to prepare grains with needle shape and mostly of a uniform orientation. If such grains are utilized to make thin-film transistor, its characteristics may be improved.
扩散界面场变量模型模拟晶粒长大过程
陈大钦,郑子樵,刘祖耀,李世晨
金属学报 , 2003,
Abstract: 采用扩散界面场变量模型模拟二维晶粒长大的动力学过程,利用该模型可以避免常规方法中由于格点离散化带来的晶粒长大各向异性,并能过建立晶界能与梯度能量系数间的关系模拟得到了异常晶粒长大过程的微观组织演化图.模拟结果得出的晶粒形态、动力学和拓扑学结构特征等与已有的实验结果和理论分析一致.
Effect of Strontium Addition on Dendrite Growth and Phase Precipitation in AZ91D Magnesium Alloy
Sr对AZ91D镁合金枝晶生长和相析出的影响

ZHOU Jixue,WANG Bin,TONG Wenhui,YANG Yuansheng,
周吉学
,汪 彬,童文辉,杨院生

金属学报 , 2007,
Abstract: 加入微量Sr(0.01%-0.1%,质量分数)可明显细化AZ91D镁合金晶粒,随Sr含量增加,初生相α-Mg尺寸逐渐减小,而二次枝晶间距变化不大,同时β-Mg17Al12析出相增多.Sr添加量为0.1%时,针状或块状Al4Sr相依附在枝晶间的β-Mg17Al12相上析出.Sr在AZ91D合金凝固固-液界面前沿富集,并且优先在曲率较大的枝晶端面富集,从而抑制晶粒长大,细化了合金中初生相α-Mg;同时,Sr在枝晶的尖端富集降低了初生相α-Mg的尖端生长优势,改变了初生相形貌.
纳米掺铁二氧化钛的sol-gel法制备与表征(ⅱ)纳米掺铁二氧化钛的微晶特性与晶体生长
水淼?,徐铸德?,岳林海?
无机化学学报 , 2001,
Abstract: 本文结合透射电镜分析研究了sol-gel方法制备的纯二氧化钛和掺铁二氧化钛干凝胶的晶化过程。计算了在不同的煅烧温度下二氧化钛微晶的晶胞参数,晶粒度,畸变等参数的变化关系。应用非晶物质晶化晶核生长速率方程计算的晶粒生长活化能表明晶粒生长分为两个阶段,临界点大约为相变温度。纯的和掺铁的二氧化钛在两个阶段的晶粒生长活化能分别约为20.8kj·mol-1,70.9kj·mol-1和26.6kj·mol-1,78.8kj·mol-1。这个差别可能是由于相变过程首先发生在小晶粒上,导致小晶粒生长较为困难所致。
GROWTH OF INTERFACE WITH AN EXTERNAL FIELD
外场存在时界面生长的重整化群研究

HAN FEI,MA BEN-KUN,
韩飞
,马本堃

物理学报 , 1993,
Abstract: The dynamics of a growing interface with an external field is investigated. The nontrivial fixed point is found and the exponents are calculated. The result shows that the external field tends to smoothen the interface and does not break the Galilean invariance.
水热条件下钛酸钡晶粒生长基元模型研究(Ⅱ)——生长基元稳定能计算及晶粒的成核与生长
施尔畏,元如林,夏长泰,王步国,仲维卓
物理学报 , 1997,
Abstract: 报道了BaTiO3晶粒生长基元稳定能计算的结果,并以此说明了水热条件下BaTiO3晶粒成核及生长过程
Growth Behavior of α Phase in Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo-0.35Si-0.7Nd Titanium Alloy
Shangzhou,ZHANG,Yuan,GAO,Guodong,WANG,Yuyin,LIU,Rui,YANG
材料科学技术学报 , 2006,
Abstract: The thermal stability of the microstructure of a near-α titanium alloy after aging at 750℃ was investigated using optical microscope and transmission electron microscope as well as composition analysis. Aging treatment brings about significant coarsening of grain boundary α and α platelets within the colonies for martensitic microstructure. The observed changes are related to the growth steps or ledges of the interface and lamellar termination presented in the microstructure. The composition analysis of the coarsened α plate is consistent with the growth kinetics. The α Widmanstaetten plates were coarsened due to the movement of α /β interface for Widmanstaetten microstructure, and the phase boundaries of primary α(αp) phase directly moved into the transformed β for bimodal microstructure.
STABILITY ENERGY OF GROWTH-UNIT AND MORPHOLOGY OF SPHALERITE CRYSTALLITES
硫化锌晶粒生长基元稳定能及生长形态

YUAN RU-LIN,SHI ER-WEI,WANG BU-GUO,XIA CHANG-TAI,LI WEN-JUN,ZHONG WEI-ZHOU,
元如林
,施尔畏,王步国,夏长泰,李文军,仲维卓

物理学报 , 1997,
Abstract: The zinc-based compound crystals, which are composed of zinc-anion coordinate tetrahedrons have two kinds of structure:one is wurtzite and the other is sphalerite.In this article the formation process and the ideal morphology of the sphalerite crystals are studied by calculating the stability energy of the crystal growth unit on the basis of the model of anion coordination polyhedron.The favorable growth unit for the growth of the sphalerite crystal is the tetrahedron.Thus the ideal morphology of sphalerite crystals is tetrahedron.The growth rate of the positive polar plane is different from that of the negative polar plane.It is proved by the calculation that zincoxide crystals are impossible to exist in sphalerite,so are zincsulphide crystals in wurtzite.
3种相分布模型中纳米复合永磁体矫顽力与晶粒尺寸的关系
冯维存,李卫,朱明刚,韩广兵,高汝伟
金属学报 , 2008,
Abstract: 建立了3种物理模型,研究了纳米复合永磁材料中晶粒尺寸、两相分布及体积分数与矫顽力间的变化关系.计算结果表明不同的两相分布导致晶粒接触界面分数变化,从而引起晶间交换耦合作用的涨落;相分布影响纳米复合永磁体矫顽力的大小,但没有改变其随晶粒尺寸变化的关系;设计理想的相分布并且适当控制晶粒尺寸,是实现纳米复合永磁材料高矫顽力的可能途径.
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