查询词典 equiaxed

The primary phases of Al-10% Cu, Al-20% Cu Al-40% Cu alloy are nearly equiaxed spherical or rose spherical by semi-solid processing. Compared with the coarse arborization of Al-10% Cu, Al-20% Cu Al-40% Cu alloy of conventional casting, the structure of alloy is extremely improved and the appropriate grain size for the engineering application is obtained.

结果表明：利用半固态加工，可以使Al-10%Cu、Al-20%Cu、Al-40% Cu合金的初生相呈近等轴的球状或蔷薇球状，与普通铸造Al-10% Cu、Al-20% Cu、Al-40%Cu合金较粗大的树枝状相比，合金的组织得到显著的改善，达到了工程应用晶粒大小。

On the basis of twin-roll thin strip continuous casting experiments and solidification structure characteristic analysis of thin strip and combining with the simulation results of effects of technological parameters, the forming mechanism of solidification structure zone (especially equiaxed crystal zone) on 1Crl8Ni9Ti stainless steel twin-roll thin strip was investigated.

在双辊薄带连铸实验和薄带凝固组织特征分析的基础上，结合对薄带凝固组织区的模拟预测结果，研究了1Cr18Ni9Ti不锈钢双辊薄带凝固组织区的形成机理。结果表明：1Cr18Ni9Ti不锈钢双辊薄带凝固组织中的等轴晶区不但在凝固类型为半固态时形成，在轧制或理想型时也能形成。其形成机理为，熔池中悬浮游离晶体的沉积、聚集以及在枝晶生长前沿的长大和薄带离开二铸辊最小间隙后，薄带/空气界面换热系数骤然降低抑制了柱状枝品的生长，并促使薄带中部未凝固熔体中游离晶体的择优长大

In the simulation, the flow rule of melt metal in mold of horizontal continuous casting with electromagnetic stirring is measured using ultrasonic Doppler velometer, and the result is inter confirmed with the solidification characteristics is tics of zinc cupronickel thin slab in industrial product, some advantageous results are obtained that, when the current is 400 A the inner micro-pores disappear, when the current is 500 A the center equiaxed crystal layers occur and when the current is to 800 A the inner-segregation decreases to zero.

在模拟实验中，用超声波多普勒测速仪测量该电磁搅拌下水平连铸结晶器内金属液的流动规律，并与生产实验中锌白铜板带的凝固特征相互印证，发现搅拌电流达到400 A时，板带内部气孔消失，电流达到500 A时板带出现等轴晶带，电流达到800 A时板带坯偏析率趋于零。

Under the high frequency vibrating action, the crystal grain formed on the surface of the crystal nucleus eradiation equipment would be broken and peeled off, thereby ejected to zinc molten pool continuously and served as crystal nucleus source of equiaxed grain during solidification.

结果表明，当一种带有冷却结构且进行高频振动的晶核发射器插入锌液内时，锌液在晶核发射器表面迅速形核且长大，在高频振动作用下表面形成的晶粒将被折断剥离，从而连续不断地弹射到锌液中，成为凝固过程中形成大量等轴晶的晶核来源；采用带有水冷和气冷结构的晶核发射器对锌液进行振动激发形核处理后，锌凝固组织中的等轴晶率可分别提高到65%和80%。

The key to solve these problems is enlarging equiaxed grain zone and fining grain size.

解决这一问题的关键是扩大铸坯等轴晶区比例，细化晶粒。

The results show that the equiaxed zone ratio of the casting billet is greatly increased,with its soidification structure is obviously improved,and the momentum values of the electromagnetic forces both parallel to and perpendicular to the direction of the traveling magnetic field pulsate periodically with time.

采用三相通入不同电流的非平衡线性电磁搅拌技术进行了铸坯的静态浇铸实验，并对电磁搅拌过程中钢液内的电磁力各分量的瞬时值进行了理论分析·结果表明，当采用将电磁搅拌器的三相通入不同电流的非平衡线性电磁搅拌时，在钢液内所产生的电磁力是脉动的，其大小呈周期性变化，尤其是垂直于磁场运动方向上的电磁力，其脉动的幅度很大·由此认为，当采用将搅拌器的三相通入不同电流的非平衡线性电磁搅拌时，所产生的垂直于磁场运动方向上的脉动电磁力是提高等轴晶比率，改善铸坯凝固组织的一个重要原

In fact, these solidified structure is composed of equiaxed polyhedral crystal with the size of about 100nm.

实验还发现上述各种凝固组织均由尺寸为100nm左右的等轴状多面体结晶颗粒组成。

Moreover, the hot compressive deformation behavior of the RS/PM AZ91 magnesium alloy and AZ91 alloy matrix composite were also investigated, the conclusions are drawn as follows:1. The processing parameters of the atomization-twin rolls quenching technology were optimized as follows: the diameter of the nozzle 1mm, the wheel velocity 25m/s, the pressure of atomization gas 0.3MPa and Ar gas for melt injection 0.1MPa. The RS AZ91 alloy flakes exhibited fine and uniform microstructures. When the flakes were extruded at 673K, extruded velocity of 0.1mm/min and extrusion ratio of 25:1,the magnesium alloy rods with clean surface, uniform dimension and excellent mechanical properties were obtained.2. The RS AZ91 magnesium alloy powders prepared by atomization-twin rolls quenched technology exhibited fine equiaxed grains with the grain size of 1-3μm, the phase constituent included supersaturate solid solution phaseα-Mg and miner fineβ-Mg_(17)Al_(12) phase. The as-extruded materials also exhibited equiaxed grains with the size of 5-7μm and a large number of fineβ-Al_(12)Mg_(17) and fewer AlMg_2Zn phases were detected in the alloy.

本文还研究了快速凝固/粉末冶金AZ91镁合金热压缩变形流变应力行为，快速凝固/粉末冶金法原位生成Mg_2Si增强AZ91镁基复合材料，经过系统的研究，获得如下结论：1、雾化-双辊急冷法在下列工艺参数组合下：双辊线速度25m/s；喷嘴直径1mm；熔体压射压力0.1MPa；雾化气体压力0.3MPa。，可获得宏观尺寸细小、微观组织均匀细小、综合性能优良的的快速凝固AZ91镁合金细碎箔带，快速凝固箔带在挤压温度为673K、挤压速度为0.1mm/min，挤压比为25：1时，可获得的外表光洁、尺寸均匀、组织性能优异的镁合金棒材。2、雾化-双辊急冷法制备的AZ91镁合金粉末态为细小等轴晶组织，晶粒尺寸1-3μm，组织为α-Mg过饱和固溶体和微量的细小β-Mg_(17)Al_(12)相组成；粉末挤压棒材为等轴晶组织，晶粒尺寸5-7μm，组织中含有大量细小的β-Al_(12)Mg_(17)以及AlMg_2Zn析出相，室温力学性能，抗拉强度383MPa，屈服强度275MPa，断后伸长率7.5%。

Equiaxed and bigger grains are produced after C.P.Ti is deformed under the high temperature. Besides, many tiny subgrains were found in some of the metallurgical structure. The dislocation reaction caused by the deformation under the high strain rate generates ductile cellular metastructures, while the equiaxed cellular metastructures are generated under the low strain rate. The metallurgical structure of TC4 alloy including lath-shaped hexagonal martensite and trimetric martensite only exists in the higher temperature. The homogeneous, tiny and reticular grain shown after extreme high temperature deformation.

在高应变速率下变形引起的位错反应形成拉长的胞状亚结构，而低应变速率下变形则形成等轴的胞状亚结构；TC4合金在特高温变形条件下其金相组织呈网篮状，显微组织几乎全部为均匀细小的晶粒，同时出现了板条状六方马氏体；在温度尤其高的情况下还形成了斜方马氏体，变形引起的位错反应形成六方位错网络，在1200℃以下的变形易产生孪晶。

Phase identification and microstructure observation of the composites were performed by X-ray diffraction, Electron Probe Microanalyses and transmission electron microscopy. The results show that ZrB2 phase is equiaxed or near equiaxed, which is hexangular and less 1μm in size. ZrAl3 phase is long strip-shaped. The in-situ reinforcements are distributed uniformly in the matrix and the interface is clean,without any other chemical products.

借助于X射线衍射仪、电子探针和透射电镜对复合材料的物像和增强相进行了观察，结果表明ZrB2颗粒呈等轴或等轴颗粒状，为六方结构，尺寸大部分小于1μm，ZrAl3相大部分呈长条状，两种增强相整体分布较为均匀，且与Al的界面光滑洁净，没有其它界面生成物。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。