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异质形核
相关语句
  heterogeneous nucleation
     Heterogeneous Nucleation of α-Mg, Mg_2Si in Mg Alloys and Development of Relevant Master Alloys
     镁合金中α-Mg、Mg_2Si相的异质形核机制与相关中间合金研究
短句来源
     Al2O3 acts as the nucleus of heterogeneous nucleation.
     位于夹杂物中心的Al2O3起着TiN异质形核核心的作用;
短句来源
     Mg_3Sb_2 had the same close-packed hexagonal structure as a-Mg, which conformed to the fundamental of heterogeneous nucleation, and was the favorable nucleating center.
     生成的Mg_3Sb_2相与α-Mg基体具有相同的密排六方结构,满足非均匀形核的基本条件,是良好的异质形核核心;
短句来源
     Characleristics of the substrates with lower θ PLU were studied starting from heterogeneous nucleation theory and Fowkes theory on estimating interfacial energy.
     本文从异质形核理论和估算两相间界面能的Good -Girifalco极性理论出发 ,研究了具有较低θPLU的结冰基体的性质 ,提出了选择方法。
短句来源
     It is considered that there are two modification mechanisms for eutectic Al-Si alloys treated by Al-P-Si master alloy, one is heterogeneous nucleation and refining of primary Si phase by AlP particles, the other is P atoms dissolved in Si phases and modify the structure and morphology of Si phases.
     但研究发现Al-P-Si中间合金对共晶和过共晶Al-Si合金变质机理存在差异:过共晶Al-Si合金变质是AlP异质形核机理,而对于共晶Al-Si合金而言,一方面需要AlP异质晶核促使初晶的析出,另一方面还需要部分P原子以固溶形式存在,以影响Si相的结构和形态。
短句来源
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  heterogenous nucleation
     Nucleation analysis shows that heterogenous nucleation would take place in the two quaternary Ni-Cu-Co-Fe alloys even at the maximum undercooling obtained in the experiments. With the increase of undercooling, the transition of the microstructure of a-Ni phase from dendrite to equiaxed grain, accompanied by the grain refinement was discovered in all the four Ni-based multicomponent alloys.
     对电磁悬浮条件下的Ni-10%Cu-10%Co-10%Fe与Ni-40%Cu-10%Co-10%Fe两种合金中的形核机制的分析表明,在实验达到的最大过冷度条件下两种合金仍然发生异质形核
短句来源
  “异质形核”译为未确定词的双语例句
     The Cr2Ti particle in Al7.2(Cr2Ti)3.3 refiner not only acts as heterogeneous nucleus of the primary Mg2Si but also distributes around Mg2Si boundaries to restrain the growth of Mg2Si, so that the morphology of Mg2Si changes into regular spherical or granular shapes.
     Al_(7.2)(Cr_2Ti)_(3.3)细化剂中的Cr_2Ti质点一方面作为Mg_2Si的异质形核核心,另一方面分布在颗粒的边界上,抑制了Mg_2Si相的长大,使Mg_2Si相的形状向规则的球、粒状转变,尺寸明显减小。
短句来源
     The catalytic factors f(θ) of Ni3Si and α(Ni) were 0.069 and 0.28 respectively,calculated with the experimental data and the kinetic model of heterogeneous surface nucleation.
     根据实验数据和表面异质形核速率模型,求得Ni3Si和α(Ni)相异质形核时的异质形校因子f(θ)分别为0.069和0.28;
短句来源
     Addition of a proper amount of Si can effectively enhance the glass-forming ability by suppressing the formation of primary Ni(TiZr)and(TiZr)(CuAl)2 phases.
     Si显著增加玻璃形成能力主要是抑制引起异质形核的Ni(TiZr)相和(TiZr)(CuAl)2相的形成。
短句来源
     The Mg3(P04)2 compound which was formed after adding P element into the alloy becomes the heterogeneous nucleus of the primary Mg2Si, and it not only makes Mg2Si refined but also improve the elongation and UTS of Al-20Mg2Si alloy.
     P元素在合金中形成了充当初晶Mg_2Si异质形核核心的Mg_3(PO_4)_2化合物而使其得到了细化,提高了Al-20Mg_2Si合金的延伸率和抗拉强度;
短句来源
     The heterogeneous nuclcation mechanism of α-Mg and Mg_2Si in Mg alloys was investigated to clarify the grain refinement and modification.
     探讨了α-Mg、Mg_2Si相的异质形核机制。
短句来源
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  heterogeneous nucleation
Given the expression for the nonequilibrium work of bubble (droplet) and the distribution of heterogeneous centers, the obtained result may be readily generalized to the case of heterogeneous nucleation.
      
The specific features of heterogeneous nucleation and the subsequent phase transformations during transition to the equilibrium are studied in the vicinity of the boundaries.
      
The oxygen-containing precipitates and precipitate dislocation pileups formed in the silicon wafer bulk during multistage heat treatment are efficient heterogeneous nucleation sites of dislocations under the action of thermal or mechanical stresses.
      
Heterogeneous nucleation of martensite at dislocations and the martensitic-transformation kinetics in shape memory alloys
      
The heterogeneous nucleation of martensite at dislocations is shown to increase the characteristic temperature of the martensitic transition and its temperature smearing.
      
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  heterogenous nucleation
We consider the mechanism of heterogenous nucleation of ice, taking into account the effect of critical phenomena in supercooled water on the rate of ice crystal formation.
      
Classical massive-transformation heterogenous nucleation occurs at α:α grain boundaries with an orientation relationship of [111]γ//[0001]α and .
      
It was believed that the formation of the AgZn3 compound at the interface occurs through heterogenous nucleation during solidification.
      
  heterogeneous nucleation site
The relaxation of the stressed structures of the polyether moiety might serve as a calcium trap and a heterogeneous nucleation site for calcification.
      
Results of an elementary model for heterogeneous nucleation also exhibit a similar bifurcation nature, here the potency of a heterogeneous nucleation site replacing the role of the temperature in the phase diagram of a van der Waals fluid.
      
The roles of cooling rate, heterogeneous nucleation site density, and grain multiplication in structure refinements are well known.
      
These Cu clusters develop to fcc-Cu, which provides heterogeneous nucleation site for -Fe primary crystals.
      


Liquid-quenching apparatus was used to investigate the inoculation process in cast iron. The following results were obtained: the original shape of flake graphite is circular or spheroid; the major effect of inoculation is to reinforce the capacity of heterogeneous nucleation of graphite.Using WDX and EDAX to examine the original graphite, we have found: there are three types of compounds which can be served as substrates of graphite nucleation, that is, MnS(including complex sulphides),SiO2,CaC2. Among these,...

Liquid-quenching apparatus was used to investigate the inoculation process in cast iron. The following results were obtained: the original shape of flake graphite is circular or spheroid; the major effect of inoculation is to reinforce the capacity of heterogeneous nucleation of graphite.Using WDX and EDAX to examine the original graphite, we have found: there are three types of compounds which can be served as substrates of graphite nucleation, that is, MnS(including complex sulphides),SiO2,CaC2. Among these, the complex sulphides are the most effective heterogenous nuclei.

采用液淬法研究了铸铁的孕育过程。指出:片墨的初始形态为团球状。孕育的作用主要是增强石墨的异质形核能力;对石墨雏晶用谱仪检测表明:可作为石墨结晶的异质核心有MnS(包括复合硫化物),SiO_2,CaC_2三种类型,其中复合硫化物是最为有效的异质晶核。

Ni-32.5%Sn eutectic alloy has been undercooled by up to 302K(0.215T_E)throughdenucleating with a special boron-silicate glass 70% Na_2SiO_3+17.7% Na_2B_4O_7+12.3%B_2O_3.Its rapidsolidification behaviour during recalescence was studied by means of high speed cinematography andrapid infrared pyrometry,It is found that interface heterogeneous nucleation takes place in preferenceto homogeneous nucleation even at an undercooling above the previously accepted critical undercool-ing 0.2T_mfor homogeneous nucleation,and...

Ni-32.5%Sn eutectic alloy has been undercooled by up to 302K(0.215T_E)throughdenucleating with a special boron-silicate glass 70% Na_2SiO_3+17.7% Na_2B_4O_7+12.3%B_2O_3.Its rapidsolidification behaviour during recalescence was studied by means of high speed cinematography andrapid infrared pyrometry,It is found that interface heterogeneous nucleation takes place in preferenceto homogeneous nucleation even at an undercooling above the previously accepted critical undercool-ing 0.2T_mfor homogeneous nucleation,and that the transient solidification velocity attains 784mm/s.

以特制的无机盐玻璃70%Na_2SiO_3+17.7%Na_2B_4O_7+12.3%B_2O_3作为净化剂,去除液态Ni-32.5%Sn 共晶合金中的异质晶核,使过冷度达302K(0.215T_E)。采用高速摄影及快速红外测温技术研究了深过冷熔体的快速凝固行为。发现尽管过冷度超过了以往认为的均质形核临界过冷度0.2T_m,但是 Ni-32.5%Sn 共晶合金仍然优先发生界面异质形核,再辉过程中瞬时凝固速度最大可达784mm/s。

Large undercooling up to 397 K (0.283T_E) have been obtained for Ni-32.5%Sn eutectic alloy melt by superheating-cooling cycles and denucleating withinorganic glasses. The predominant dissipation of heat for highly undercooled alloymelt is through radiation. An approximate method was consequently derived to cal-culate its mean specific heat from measured cooling curves. With the aid of highspeed cinematography, it was revealed that the surface or interface heterogeneousnucleation takes place in preference to...

Large undercooling up to 397 K (0.283T_E) have been obtained for Ni-32.5%Sn eutectic alloy melt by superheating-cooling cycles and denucleating withinorganic glasses. The predominant dissipation of heat for highly undercooled alloymelt is through radiation. An approximate method was consequently derived to cal-culate its mean specific heat from measured cooling curves. With the aid of highspeed cinematography, it was revealed that the surface or interface heterogeneousnucleation takes place in preference to homogeneous nucleation even though theundercooling exceeded 0.2T_E.

本文采用循环高温过热和无机盐玻璃净化剂去除液态Ni-32.5%Sn共晶合金中的异质晶核,获得高达397K(0.283T_E)的过冷度,发现深过冷熔体主要以辐射方式散热,从而导出一种根据冷却曲线近似计算其平均比热的方法,采用高速摄影技术研究了其再辉过程,发现即使过冷度超过0.2T_E,液态合金仍然优先发生界面异质形核

 
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