查询词典 solidification

The primary phase formation and phase evolution during growth processes related to the undercooling D T and solidification velocity V were systematically investigated by the means of high undercooling and laser resolidification techniques.

由于材料的最终组织取决于凝固初期的相选择和凝固后期的组织演化过程，因此对非平衡条件下包晶合金中的相形成规律研究具有相当重要的理论意义和应用前景。

The formation of secondary phase in the non-equilibrium peritectic reaction was observed by precise transmission electron microscopy analysis. The microstructural evolution and phase selection regularities under different solidification velocities were constructed from the laser resolidification experiments. A new phenomenon involving two-phase coupled growth was firstly detected in the rapidly solidified Ti-Al peritectic alloy. The Ti-45Al-2Cr-2Nb alloy with fully lamellar structure ( a 2+ g ) was taken as an object to investigate the possible preparation of bulky metastable g phase materials based on both adjusting the competing nucleation relation and changing the growth kinetics condition.

首先通过过冷合金微观组织分析界定了各包晶合金熔体中各竞争相以初生相出现的过冷度区间；结合高温区的相图计算，从各相形核孕育时间角度揭示了过冷熔体中亚稳相与稳定相的竞争形核关系；通过精细微观组织分析，阐明了远离平衡时包晶反应中次生相的形成机理；在激光重凝快速凝固实验中建立了不同凝固速度下合金的组织与相形成规律，并对包晶合金中两相共生生长行为进行了深入分析；最后选取初生相为 a 的全层片 Ti-45Al-2Cr-2Nb 合金，从调整各相竞争形核关系和改变晶体生长动力学条件两个方面探索了块状亚稳 g 相材料的制备和控制。

And the PLA/Chitosan/ACP barriers with additional 2 wt% chitosan still maintain 56.58 % antibacterial ability after eightieth day. The different composition of PLA/Chitosan/ACP composites was prepared by water washing solidification from NMP/water/lactic acid consolvent. After storing at room temperature for 48 hours and taking it out to obtain a shapable composites. To investigate the influence of ratio of composition with the shapable property of composites, it was analyzed by Rheometer, TGA, AFM, XRD. The result of the different APC content had different effect both water content and yield stress of composite materials. The yield stress decreased with ACP content while increases. It was derived that ions, released from ACP interact with amide groups of chitosan to form water-absorbing ionic clusters through chelating or electrostatic attraction.

另外，以聚乳酸/几丁聚醣作为基材并添加不同比例的非晶型磷酸钙，经过水洗固化后可得白色片状沉淀物，於室温下静置48小时后，复合材之体积呈现膨胀且具有可塑形之特性，以热重分析仪与流变仪分析样品之含水率与屈伏应力，结果显示不同ACP含量对复合材含水率与屈伏应力具有消长变化，而PLA/Chitosan/ACP之可塑程度与其所吸收之水份多寡有关，推测可能机制为ACP磷酸钙盐解离后之金属离子与几丁聚醣之胺基透过螯合作用或静电吸引之交互作用，形成具吸水性之离子团簇分散於疏水性之聚乳酸基材中。

Because of the lower density of the rejected solute during the horizontal solidification of NH4Cl-70%H2O, channels grow slantways and upwards and A type segregates form in the upper region of mush.

NH4Cl-70%H2O侧向凝固时，析出的溶质密度较小，偏析通道倾斜向上生长，在糊状区上部形成A偏析。

The directional solidification under negative temperature gradient with unstrained cooling and superrefined directional microstructure are observed.

并在△T〓≤△T＜△T〓过冷度区间完成了无外界冷速约束的负温度梯度下的定向凝固，获得了快速凝固条件下的超细定向组织。

A simplified model was proposed to simulate material microstructure according that metal solidification is a Monte Carlo process. First, use the point of"putting randomly, growing uniformly"to generate grain boundary, then recognize grain boundary trifurcate points, eliminate bad trifurcate points, and distinguish the connections among these points, thus obtain straight grain boundary picture.

根据金属凝固过程是—Monte Carlo过程，建立了金属材料显微组织的简化Monte Carlo方法，采用&随机投放，等速生长&的方法形成矩齿形晶界图，并通过逐点判断法识别出晶界三重点，剔除奇异三重点，并识别出晶界及晶界间相邻关系，从而获得晶界结构的直线近似形态图，为细观组织短裂纹的数值模拟作好准备。

A continuum model integrated with heat, mass, momentum transport behavior is applied to simulation of solidification process of continuous casting billets, and the effects of undercool degree on simulation are considered in particularly.

将连铸坯凝固过程三个区（固相区、固液两相区、液相区）的三个场的定量描述统一在同一组微分方程中，实现了连铸坯凝固过程温度场、流场和溶质场的数值模拟。

There is granular material on the top and the edge of the spikes induced by nanosecond laser pulses in air atmosphere, which is formed by solidification of the droplets. The micro-structures formed in air are different from the slender whiskerlike structures created by excimer laser and also different from the conical microstructures with dendritic nanostructures formed under femtosecond laser irradiation.

部分锥形上还有二次尖峰形成，空气中纳秒激光诱导的锥形尖峰微结构顶端和边缘有由液滴固化形成的粒状物质，不同于利用准分子纳秒激光诱导的细长须状结构和飞秒激光辐照下产生的具有表面枝蔓状纳米结构的锥形微结构。

The solidification process of the atomized Al-Pb alloy drop was discussed in details.

结果表明，快速凝固，特别是喷射成形技术在偏晶合金制备

On the basis of model above, effects of suspension casting on solidification process of billets are discussed in detail.

悬浮剂是否可以促进钢液生核，取决于这些颗粒的引入是否会降低体系形核所要求的能量。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。