Among them , the equal - channel angular pressing ( ecap ) technique has been proved to be an effective method for the fabrication of various bulk ufg materials without residual porosity 在目前通过强烈塑性变形制备超细晶材料的几种方法中， ecap变形法已经证明是制备无残余孔隙块状超细晶材料的有效方法。
Various present methods of preparation nanostructured materials are summarized and the theoretical analyses are made of preparation ultra - fine - crystalline and nanocrystalline metal using the rapid solidification method in this thesis 本文对国内外的各种制备纳米固体材料技术进行了综述，并对快速凝固法制备超细晶、纳米晶金属进行了理论分析。
5 ) the hardness and plasticity of the prepared ultra - fine grain materials are advanced generally ; the elastic modulus is raised slightly ; and the damping capacity increases 30 ~ 50 percent ; however , the improvement in the intension is not distinct ( 5 )所研究的超细晶材料的硬度、塑性普遍提高，弹性模量有所提高，阻尼性能提高30 50 ，但强度未有明显提高。
Severe plastic deformation ( spd ) processing , especially equal - channel angular processing ( ecap ) of steel and other iron - based alloys , has achieved increasing interest recently because of the potential for obtaining ultrafine grains and improving the properties 近年来，强烈塑性变形特别是钢和铁基合金的等径弯曲通道变形因为具有获得超细晶组织和改善性能的潜力，引起了各国研究人员的很大兴趣。
The methods and mechanism of the microstructure refinement in steel materials are introduced in the paper . a new method of microstructure refinement - equal channel angular pressing ( ecap ) is discussed with emphasis 本文首先综述了钢铁材料组织细化的方法及细晶强化机制，重点论述了制备超细晶材料的新方法? ?等径弯曲通道变形( equalchannelangularpressing ，简称ecap )的基本内容及在钢铁材料中的研究现状。
All main ways of metal strengthening including grain refining strengthening , dislocation strengthening , grain boundary and substructure strengthening , second phase strengthening , solid solution strengthening , as well as trip strengthening and so on , have totally found expression in the adi 金属强化的几种主要方式：细晶强化，位错强化，晶界与亚结构强化，第二相强化，固溶强化，细晶强化以及trip强化等都在等温淬火球铁中得到了体现。
The lath martensite nanometer structure can play the role of fine - particle strengthening and dislocation strengthening as well as coordinate the distribution of dislocation . it is hopeful that the strength and toughness of material with this structure can be increased at the same time 板条马氏体组织纳米化结构，可起到纳米晶粒的细晶强化与位错强化的联合作用，并可协调位错分布，有望使具有这种组织的材料强度和韧性同时得以提高。
The main intention of this study is to investigate 95 alumina substrates by tape casting process , which will be used as ceramic packages in kinds of integrate circuit ( ic ) . high bending strength and fine surface were required as the basic properties of ceramic substrates . in this thesis , based on the research of the tape casting used in ceramic substrates at home and abroad 本文综述了国内外研究现状，着重研究细晶氧化铝的制备和流延工艺参数的控制，以及细晶95al2o3瓷的制备，研究al2o3原料（包括种类和粒度） 、掺杂改性剂、流延浆料、有机配方等对95al2o3瓷基片性能的影响，获得最佳流延配方，流延基片综合性能良好，成功制备了细晶氧化铝瓷基板。
The influence of burning system on the properties and structure of the ceramic capacitors has been studied under the certain temperature system , the optimum sintering temperature of the ceramics was primarily decided by the content of bi2o3 ? 3tio2 . the sintering temperature dropped with the adding of bi2o3 ? 3tio2 . at the range of suitable sintering temperature , slow heating and low temperature sintering can obtain fine grain and dense structure . it results in the improving of the breakdown voltage for the middle - high voltage ceramic capacitors 研究了烧成工艺制度对电容器陶瓷性能和结构的影响，结果表明：在一定的升温保温时间下，瓷料的最佳烧结温度主要取决于组成中bi _ 2o _ 3 ? 3tio _ 2的含量， bi _ 2o _ 3 ? 3tio _ 2含量的增加将降低烧结温度；在合理的烧结温度范围内，慢速升温和低温烧结将有利于得到细晶致密结构，从而改善中高压陶瓷电容器的耐压强度。
We find that the petrology characteristic of all the samples have no characteristic of meteoric water such as geopetal structure , infiltrative sand , ( uniform cement and gravitational cement on base of the research of the dolomite in the regions . on the dot diagram of combination of mgco3 ( mol % ) and sr , the dot are all close to the line of seawater whether they are microlite - crystalline penecontemporaneous dolostone or diagenetic dolostone of various crystals . the 87sr / 86sr value of dolostone or matrix is less than the one of sparry calcite in cave or vein , and close to the value of seawater 通过本区白云岩的研究发现：已有的白云岩样品的岩石学特征没有显示出如示底构造、渗滤沙、新月型胶结物和重力胶结物等大气淡水作用的特征；在白云石mgco _ 3mol百分数和白云石sr含量的投点图中，无论是准同生成因的泥?微晶白云岩，还是粉?细晶(或中晶，或细晶以上的不等晶)的成岩白云岩，均投在海水线的附近；白云岩(或基质)的~ ( 87 ) sr / ~ ( 86 ) sr比值显著低于与孔洞或脉中充填的亮晶方解石，且与海水值十分接近， ~ ( 13 ) c和~ ( 18 ) o值显著高于孔洞或脉中充填的亮晶方解石，也偏向于海水值； mn含量则显著低于孔洞或脉中充填的亮晶方解石。
