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高压退火
相关语句
  high pressure annealing
     EFFECT OF HIGH PRESSURE ANNEALING ON MICROSTRUCTURAL TRANSFORMATION OF NANOTUBES
     高压退火对碳纳米管微结构转变的影响
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  “高压退火”译为未确定词的双语例句
     Br=1.11 T, Hci=816.0 kA·m-1 and (BH)max=188.8 kJ·m-3 are achieved in the ribbons with Pr8Dy1Fe74.5Co10Nb0.5B6 annealed under high pressure.
     通过对Pr8Dy1Fe74.5Co10Nb0.5B6合金薄带高压退火,获得了Br=1.11T,Hci=816.0kA·m-1和(BH)max=188.8kJ·m-3的高性能。
短句来源
  相似匹配句对
     ANNEALING OF GLASS
     玻璃的退火
短句来源
     HIGH PRESSURE HEAT EXCHANGER
     高压换热器
短句来源
     After welding of high pressure vessels,annealing is necessary to remove theresidual stress which is induced during the welding.
     高压容器在焊接以后,必须进行去应力退火
短句来源
     EFFECT OF HIGH PRESSURE ANNEALING ON MICROSTRUCTURAL TRANSFORMATION OF NANOTUBES
     高压退火对碳纳米管微结构转变的影响
短句来源
     Mechanochemical Effects of Nanostructure Alumina by Annealing
     纳米氧化铝的退火
短句来源
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  high pressure annealing
High pressure annealing was carried out in Bridgman anvils apparatus.
      


It was proposed ninety years ago, that after condensation of vapor it is necessary for the condensation to pass through possible high temperature phases until the equilibrium phase is reached. However, it was in general impossible for metals and alloys to freeze a structure of liquid or metastable phase for the reasons of technologies at that time.After then, by the other way, high pressure method has been used to synthesize the metastable phase, in which diamond is one of the succeeded examples as known is...

It was proposed ninety years ago, that after condensation of vapor it is necessary for the condensation to pass through possible high temperature phases until the equilibrium phase is reached. However, it was in general impossible for metals and alloys to freeze a structure of liquid or metastable phase for the reasons of technologies at that time.After then, by the other way, high pressure method has been used to synthesize the metastable phase, in which diamond is one of the succeeded examples as known is to all. with energy situated between liquid and equilibrium states.During the past decade, the studies on amorphous and other metastable alloy were earned out intensively, because of the improvements of techniques to solidify liquid alloys at large undercooling, such as small dropler processing and liquid quench. In the former case, formation of a meiastable phase is dominated by "static" undercooling.From thermodynamic studies, it was shown that the nucteation of a metastable phase becomes more likely than that of the stable phase. With an increase in undercooling, some metastable phases with lower melting points, which have beer, exposed at high pressure, were solidified under atmospheric pressure by using small droplet processing. But for alloys wilh higher melting poinis the metasiabte phases have never been prepared in the same way as carrier medium is limited for dropiets. In the case of liquid quenching the metastable phases are formed by a kinetic process. Although the quenching rate to freeze liquid fnto the metallic glasses is usually lower than to transform which, into a crystalline metastable phase, the latter is more difficult to exposure owing to its strict quenching condition.Simitar to the solidification of liquid, the crystallization of an amorphous alloy may yields some metustable phases before the equilibrium state was formed. However, the me-lastble phases are not able to discover due to the fast kinetics of crystallization in many eases. Recently, the idea to expose meiasiable phase kinectically by high pressure was proposed on the basis of the investigations on crystallization processes of the amorphours alloys under high pressure According to the generd transformation diagram for amorphours alloys heaied under pressure, there are three types for transformation mode: a process to decompose muluphase.s at lower pressure, a process form single phase metallic compound at higher pressure and a process to yield disorder solid solution at ultra pressure. Differences in the mode were attributed to an effect of high pressure on the alomic rearrangements occured in the interfaces between amorphours and crystalline phases. In general, diffusion for rearranging atomic positions is suppressed by pressure, so the meiasiable phase accompaned wilh smaller entropy change and alomic rearrangemenl during its forming should be preferred to form kinetically.

很久以前,便有人指出,气态冷凝成固态时,要连续经历液相及各种高温相,才达到平衡结晶相。但是,液态及高温相往往需靠很大的冷却速度才能冻结下来,这在当时对绝大多数合金,是不可能的。 近些年,随着超急冷等技术的进步,关于非晶等亚德相的研究十分活跃。当超过一定临界冷却速度时,液态合金可固化为非晶态。虽然,亚稳结晶相较非晶应更容易冻结,但是,由于产生各种亚稳相所需的过冷条件各不相同,以及对冷却速度的选择不能是任意的,因此有时它们较非晶还难于形成。 与波相凝固过程相似,非晶合金的晶化也服从构形最小重排原理,即在晶化完成之前,存在某些亚稳相变态阶段。但是,限于热力学上的不稳定性及动力学因素,在常压下这些亚稳相同样是难以发现的。 作者根据对多种合金系的研究,提出高压暴露亚稳相的设想,并利用非晶等亚稳相的高压变态过程,将进行液态急冷时的速度控制方式,改为便于掌握的高压退火方式,来获得新亚稳相。 本文对压力暴露亚稳相的原理和实践,加以论述。

This paper reports the results of crystallization of bulk metallic glassy sphere of Pd40-Ni40P20 (with diameter range from 0.1 to 1.0 mm) under 4GPa pressure. Compared with the result obtained at ambient pressure, the crystallization temperature of the glass increased with pressure at the rate of 15K/GPa. As annealing temperature under pressure closed to the melting temperature of the sample, the single supersaturated solid solution phase with f.c.c. structure was obtained. The same phase was also obtained by...

This paper reports the results of crystallization of bulk metallic glassy sphere of Pd40-Ni40P20 (with diameter range from 0.1 to 1.0 mm) under 4GPa pressure. Compared with the result obtained at ambient pressure, the crystallization temperature of the glass increased with pressure at the rate of 15K/GPa. As annealing temperature under pressure closed to the melting temperature of the sample, the single supersaturated solid solution phase with f.c.c. structure was obtained. The same phase was also obtained by annealing a cast Pd40Ni40P20 alloy under high pressure. This result indicates that the new phase is a high pressure phase.

本文中研究了Pd_(40)Ni_(40)P_(20)金属玻璃小球(直径在0.1—1.0mm的范围)在4GPa压力下的晶化过程。与常压晶化实验相比,高压下样品的晶化温度以15K/GPa的速率增加。在接近熔点进行高压退火时,获得单相过饱和固溶体。其晶体结构为面心立方。将铸态Pd_(48)Ni_(48)P_(20)合金在高压下进行退火,同样得到了该固溶相,表明该相为一新的高压相。

The crystallization of bulk metallic glass of Pd40Ni40P20 was investigated under 4GPa high pressure and atmosphere. The time-temperature transition curves were obtained. The results showed that the crystallization.temperature of the glass increases with pressure at the rate of 15K/GPa. The long-range diffusion-controlled growth and the viscous flow of the phase-separated melt were suppressed by the pressure. As high pressure annealing temperature close to the melting temperature, a new single phase of supersaturated...

The crystallization of bulk metallic glass of Pd40Ni40P20 was investigated under 4GPa high pressure and atmosphere. The time-temperature transition curves were obtained. The results showed that the crystallization.temperature of the glass increases with pressure at the rate of 15K/GPa. The long-range diffusion-controlled growth and the viscous flow of the phase-separated melt were suppressed by the pressure. As high pressure annealing temperature close to the melting temperature, a new single phase of supersaturated solid solution was obtained, for which the lattice constant is 0.369nm.

本文研究了Pd_(40)Ni_(40)P_(20)块状非晶在4GPa及常压下的晶化过程。得到了时间-温度转变图。结果表明:高压下样品的晶化温度明显升高,压力对原子的长程扩散及相分离熔体的粘性流动均有抑制作用。在接近熔点进行高压退火时,获得了单相过饱和固溶体。其晶体结构为面心立方。

 
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