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grain slide
相关语句
  颗粒滑移
     The Characteristics of Grain Slide and Pore Fractal Dimension Variation of Coral Sandy Soil in Loading Process
     珊瑚砂土在加载过程中颗粒滑移与孔隙分维变化特征
短句来源
     In this paper, the variation of microstructure and the complete process of grain slide during loading of the coral sand are observed with the optical microscope and the self-developed loading device.
     采用自行研制的加载装置,配装在光学体视显微镜下,观测了珊瑚砂土在加载过程中微结构的变化及颗粒滑移的全过程。
短句来源
     The statistical calculation of geoxnetric fractal dimension is conducted by the aid of the computer system, and the characteristics of grain slide and fractal dimension variation during loading are obtained.
     通过图像处理分析仪对其孔隙变化进行了几何分维数的统计计算,得到砂土在加载过程中颗粒滑移与孔隙分维的变化特征。
短句来源
  相似匹配句对
     ON GRAIN POLICIES
     粮食政策略论
短句来源
     GRAIN REGULATION
     我国的粮食宏观调控
短句来源
     About Slide Making
     浅谈幻灯片的制作
短句来源
     The Characteristics of Grain Slide and Pore Fractal Dimension Variation of Coral Sandy Soil in Loading Process
     珊瑚砂土在加载过程中颗粒滑移与孔隙分维变化特征
短句来源
     Summary of Slide Gate
     滑动水口综述
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For layer structure compounds,such as Bi_2PbNb_2O_9,Bi_2WO_6,Bi_2MoO_6 andBi_4Ti_3O_(12),we have prepared the ceramic materials with excellent oriented grains,bymeans of hot-forming methods(hot-pressing,hot-forging and hot-extrusion)combinedwith the molten salt synthesis of powder.Up to 99% grain orientation of(001)planes was obtained for the hot-forged sample.The study was mainly based on TEM technique.These TEM microphotographsshow several interesting features:first,all the hot-pressed and hot-forged...

For layer structure compounds,such as Bi_2PbNb_2O_9,Bi_2WO_6,Bi_2MoO_6 andBi_4Ti_3O_(12),we have prepared the ceramic materials with excellent oriented grains,bymeans of hot-forming methods(hot-pressing,hot-forging and hot-extrusion)combinedwith the molten salt synthesis of powder.Up to 99% grain orientation of(001)planes was obtained for the hot-forged sample.The study was mainly based on TEM technique.These TEM microphotographsshow several interesting features:first,all the hot-pressed and hot-forged samplesare very dense,and nearly free of pore:second,grains have grown quite well,andbasis the plate-like grains have aligned along the forging direction,and formed stronglytextured microstructure in the hot-forged samples:finally,the grain size and thicknessof the hot-forged Bi_2PbNb_2O_9 samples measured are 1-3μm and less than 0.5μmrespectively.The possible mechanism for the high level grain orientation behaviour of theselayer structure compounds during the hot-forging process may be interpreted on theof the following results.It appears that in the early stage of hot-forging process,the grain sliding occurs associated with significant deformation because of the shearstress between the plate-like grains caused by the uniaxial hot-forging pressing,thedie design,and the volume change caused by phase transition etc.,and in the laterstage,the grains grow and improvement of grain orientation proceeds because of theasymmetrical growth of the plate-like grains in the hot-forging condition.

利用热成型技术(热压、热锻和热挤)结合粉料的熔盐合成工艺,加工含铋层状结构化合物 Bi_(?)PbNb_2O_(?)、Bi_2WO_6,Bi_2MoO_(?)和 Bi_4Ti_3O_(12),制得了晶粒取向良好的陶瓷材料。在热锻样品中(001)晶面取向度高达99%。本实验的主要工作是在 TEM 上进行的。对热成型样品的研究,得到了下列一些结果:(1)所有的热压和热锻样品的微观结构都非常致密,几乎不存在气孔;(2)晶粒生长良好,热锻样品的片状晶粒沿着锻压方向的一致排列产生了强烈的织构化的微观结构;(3)热锻 Bi_2PbNb_2O_(?)样品的片状晶粒尺寸和厚度分别为1~3μm 和<0.5μm。根据上述结果,结合样品制备过程中所观察到的一些现象,对层状结构化合物在热锻过程中的晶粒取向可以作出下述解释:在热锻的初期阶段,片状晶粒在热锻的单向压力作用下产生的剪切应力,加上热锻模具的特殊构造以及这些化合物相转变所引起的体积变化等因素,促使晶粒发生横向滑移,这一滑移过程伴随着显著的形变;在热锻的后期阶段,在热锻条件下晶粒的非对称生长过程进一步改善了陶瓷的晶粒取向度。

Superplastic pressure welding of steel 40Cr-5CrMnMo, with prior surface after pretreatment,was performed in electro-furnace under the conditions of 710 ̄730℃、2 ̄3×10-4s-1, 50 ̄80MPa,3 ̄5min.The joints were examined to have similar strength to the steel 40Cr, The microstructure of bonding zone was analyzed by SEM. The micromechanism for superplastic bonding of steels was suggested as the disappearance of original bond interfaces caused by atomic diffusion and grain sliding superplastic deformation.

采用预先处理及表面处理,40Cr-5CrMnMo钢在空气炉中可实现超塑性固相压接.压接工艺条件为:温度710~730℃,应变速率2~3×10-4s-1、压力50~80MPa.时间3~5min.压接强度达到基材40Cr钢强度。通过接头显微组织分析,提出了钢超塑性固相压接机制为超塑变形的晶粒滑动和原子扩散造成的原始界面消失。

Solid-state joining between TiAl based alloy samples with various microstructures was investigated. When joining between coarse-grained TiAl based alloys, a fine recrystallized microstructure, which was different from those of the substrates, formed in the joining interface. When joining between a coarse-grained TiAl based alloy and an alloy of fine duplex microstructure, the coarse-grained part was penetrated by the fine-grained part due to its high superplasticity, and good joining interface was obtained....

Solid-state joining between TiAl based alloy samples with various microstructures was investigated. When joining between coarse-grained TiAl based alloys, a fine recrystallized microstructure, which was different from those of the substrates, formed in the joining interface. When joining between a coarse-grained TiAl based alloy and an alloy of fine duplex microstructure, the coarse-grained part was penetrated by the fine-grained part due to its high superplasticity, and good joining interface was obtained. When solid joining between fine-grained parts, because both parts had high superplasticity, perfect joining interface with the microstructure of substrate was obtained through grains sliding in thermal plastic deformation, and the joining component had high mechanical properties (σba=533 MPa and δ≈2%). So all the fracture occurred away from the joining interface.

研究了各种显微组织TiAl基合金材料之间自体固态焊接实验结果表明,粗晶TiAl基合金与粗晶TiAl基合金作焊接对偶件时,在结合面上形成与基体组织不同的再结晶细晶组织.这种显微组织的差异及结合面上微孔隙的残存,导致焊接组构件的断裂主要发生在结合面上.如采用粗晶TiAl合金与细晶双态组织TiAl基合金对焊时,由于细晶TiAl基合金具有较好超塑性变形能力、在热压力作用下此部分材料可镶嵌入焊接对偶另一侧,得到较好的结合采用细晶TiAl基合金材料作对偶进行固态焊接时,由于对偶材料都具有良好的超塑性,因此,可以仅仅通过晶界滑移进行超塑性变形,得到完全结合的焊接界面,结合面上的显微组织与基体一致、焊接对偶件材料得到高的室温力学性能,其值高达σb=533MPa;δ≈2%;此时,所有的拉伸试样的断裂都发生在非结合面上.

 
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