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first crystallization
The nanocrystalline structure is formed at the first crystallization stage and contains crystals of magnesium and the metastable phase.
      
Minimum ages for the first crystallization stage in individual xeno liths are 2584?±?7 Ma, 2629?±?8 Ma, 2633?±?3 Ma, whereas an approximate crystallization age for a fourth sample is 2788?±?57 Ma.
      
First crystallization leads to the formation of magnetically harder ferromagnetic material.
      
We discuss structural changes induced by annealing below and within the first crystallization stage.
      
From the DTA, we have identified the crystallization of the non-magnetic phase during the first crystallization step in microwires.
      
Such a heat treatment causes significant structural changes featuring a formation of nanocrystalline bcc-Fe grains during the first crystallization step.
      
The abnormally high value of Avrami exponent in Co-Ni glass indicates very high nucleation rate during first crystallization.
      
Presence of nanocrystalline bcc-Fe phase was detected during the first crystallization stage.
      
The first crystallization reaction corresponds to the precipitation of hexagonal Te and the second one to the crystallization of the matrix into zinc blende Ga2Te3 phase.
      
The first crystallization stage can not be traced for any of the amounts of Cu content examined, while the second stage is observed only when the Cu content is 1 at%.
      
The values of n for the first crystallization stage ranges between 1.66 and 2.57 indicating diffusion-controlled transformation in agreement with earlier reports.
      
The values of n for the first crystallization stage ranges between 1.66 and 2.57 indicating diffusion-controlled transformation in agreement with earlier reports.
      
The DTA data of the samples showed that the first crystallization temperature, Tx1, increases and the second crystallization temperature, Tx2, decreases by increasing the Er concentration.
      
This suggests that the growth mechanism is diffusion-controlled and three-dimensional parabolic growth takes place near the first crystallization temperature.
      
At the first crystallization stage, nucleation of the metastable phase MS I, with hexagonal structure and lattice parametersa = 4.49 ? andc = 5.85 ?, takes place.
      
It is proved experimentally by transmission electron microscopy that the first crystallization of METGLAS? 2826A is a two-stage process, called MSI and MSII, rather than one-stage as described by Chang and Sastri.
      
Crystallization of the Fe3B phase was related to the formation of the iron-silicon phase which was produced during the first crystallization stage.
      
After an initial decrease, attributed to structural relaxation, the linewidth increases linearly with the transformed fraction of the first crystallization phase.
      
The activation energy for the first crystallization phase is estimated from the times to reach 5 to 40% transformation to be 306 kJ mol-1.
      
The first crystallization takes place by the simultaneous formation of α-(Fe,Si) and Fe3B having the shapes of dendrite and spherulite, respectively.
      
 

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