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first crystallization
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  first crystallization
The activation energies for the first crystallization peak increased from 210 kJ/mol for Al85Y10Ni5 to 280 for Al85Y10Fe5.
      
Continuous DSC results showed that, the first crystallization peak temperature of Al85Y10Fe5 amorphous alloy was about 60 K higher than that of Al85Y10Ni5.
      
The compositional dependence of the first crystallization temperatureTx1 increased in the order of Zr >amp;gt; Nb >amp;gt; V; however, the addition of 1 at.
      
The first crystallization steps were via the formation of metastable phases.
      
The initial stages of the first crystallization (which produces an oxo-fluorapatite), and its composition dependence, are discussed in terms of the results of sinterability, and the classical theory of nucleation.
      
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The crystallization behavior of amorphous lithium ionic conductor 0.3 Li2O-0.67SiO2-0.03V2O5 has been studied under ambient and high pressures. There were two steps for the crystallization of the amorphous material. Li2Si2O5 was formed in the first step at 560C under ambient pressure while the precipitation of SiO2 occurred in the second one. The temperature of the first crystallization step Txt was greatly influenced by pressure. With the increasing pressure, it increased from 560℃ at ambient pressure...

The crystallization behavior of amorphous lithium ionic conductor 0.3 Li2O-0.67SiO2-0.03V2O5 has been studied under ambient and high pressures. There were two steps for the crystallization of the amorphous material. Li2Si2O5 was formed in the first step at 560C under ambient pressure while the precipitation of SiO2 occurred in the second one. The temperature of the first crystallization step Txt was greatly influenced by pressure. With the increasing pressure, it increased from 560℃ at ambient pressure to 620℃. the maximum, at 0.3GPa and then dropped sharply to 528℃ at 0. 4iPa. After that T(?) increased gradually with a rate of 29℃ CiPa up to 2CiPa,the highest pressure applied. An explanation will also be given.

本文应用DTA及X射线衍射法在常压及高压下对—种含SiO_2的锂离子导体玻璃0.3Li_2O-0.67SiO_2-0.03V_2O_5加热时的晶化行为进行了研究。该氧化物玻璃的晶化过程分两个阶段。在常压下,第一晶化过程发生在560℃ 附近,析出相为Li_2O·2SiO_2。对应的晶化温度T_(x1)随压力的升高发生了急剧的变化。从常压到0.3GPa,T_(x1)从560℃升高到620℃;继续升压时T_(x1)突然下降,并在0.4GPa处跌到528℃,呈现一个陡削的峰值。0.4GPa以上,T_(x1)随压力的变化则呈常规行为,比较平稳地、大致线性地升高,一直到最高测定压力2GPa。本文最后对这些行为的可能原因进行了讨论。

The crystallization behaviour of LLDPE and LLDPE/LDPE blends at different conditions of crystallization have been investigated by DSC,DMA and polarization microscope,DSC thermograms show that short branched chains do not take port in crystalline structure of linear molecules in LLDPE samples,so its Tm remains in a same value before and after sample annealing.Cocrystallization can take place betweeen the linear molecules of LLDPE and long chain branched molecules of LDPE when the LLDPE/LDPE blends crystallize...

The crystallization behaviour of LLDPE and LLDPE/LDPE blends at different conditions of crystallization have been investigated by DSC,DMA and polarization microscope,DSC thermograms show that short branched chains do not take port in crystalline structure of linear molecules in LLDPE samples,so its Tm remains in a same value before and after sample annealing.Cocrystallization can take place betweeen the linear molecules of LLDPE and long chain branched molecules of LDPE when the LLDPE/LDPE blends crystallize at a greater cooling rate or in quench,resulting in a single melting peak which value depend on composition of the blends.In the case of step-crystallization from melt of blends,two seperate melting peaks in DSC traces were observed.The higher Tm shift to higher temperature with increasing LLDPE contents while lower Tm keep constant value regardless of compositions.This suggest that cocrystalligation take place between the linear molecules and the branch one at the first crystallization stage,whereas the crystals formed at the second stage are associated with only the single component of LDPE.DMA result support this idea.It seems that LLDPE and LDPE molecules have an ability to crystallize together and form cocrystals but depend on strongly the crystallization conditions.

DSC的研究表明LLDPE高分子量线形分子结晶时,短支化链的链节不参与共晶。当LLDPE/LDPE共混物淬冷或快速结晶时,LLDPE中的线形分子可与LDPE中长支化链的链节产生共晶,其熔融单峰较宽,峰位随LLDPE含量增加而稍向高温移动。在熔体分步结晶时,观察到此共混物的熔融双峰:高温峰仍与LLDPE的含量有关,但低温峰与LLDPE的含量无关。因此可认为是LLDPE线形分子从LDPE支化分子的熔体中结晶时,二者可以产生共晶;反之,LDPE结晶时不产生共晶。

The dynamic emulation of the eutectoid transformation microstructure of nodular cast iron is realized by means of computer simulation in this paper.It includestwo parts: the formation of the graphite structure of the first crystallization and that ofthe eutectoid ferrite and pearlite. The formation of the nodular graiphite iS simulated bythe filling method The formation and growth of the eustenitie grains is by theMonte-carlo method.And the dynamic simulation of the eutectoid transformation processis realized...

The dynamic emulation of the eutectoid transformation microstructure of nodular cast iron is realized by means of computer simulation in this paper.It includestwo parts: the formation of the graphite structure of the first crystallization and that ofthe eutectoid ferrite and pearlite. The formation of the nodular graiphite iS simulated bythe filling method The formation and growth of the eustenitie grains is by theMonte-carlo method.And the dynamic simulation of the eutectoid transformation processis realized by the covering method.The structure at normal atmospheric te mperature is shown in terms of the parameters predetermined, which shows a vast prospect of the controlover the formation of the microstructure and the heat treatment for nodular cast iron.

利用计算机模拟的方法,实现了球墨铸铁共析转变组织(包括一次结晶石墨组织,共析铁素体及珠光体)形成的动态模拟,用填充法形成球墨,用MonteCarlo法模拟铁素体的形成和长大,用覆盖法实现共析组织转变过程的动态模拟,并在给定的组织参数条件下显示出常温组织,为球铁显微组织的形成和热处理提供了控制依据.

 
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