晶核形成

The results show that the glass-ceramics with fibroid structure is produced after definite heat treatment, the main crystallization phase is hedenbergite and anorthite is the minor crystallization phase. The optimal process of heat treatment shows as follows: the nucleation temperature is 850 ℃ and hold time is 100 min, and the crystallization temperature is 980 ℃ and hold time is 80 min. With increasing heat treatment temperature, the FT-IR absorption bands appear obvious split, the aluminum-oxide polyhedron in the glass network changes from [AlO4] to [AlO6]. The titanium ion in the glass network gradually transforms to the 6-coordinated, moreover forms minicrystal of MgTi2O5 and Fe2TiO4 which provides the position of heterogeneous nucleation for the growth of crystal.

结果表明：在一定的热处理条件下可以以基础玻璃制备出主晶相为钙铁透辉石，次晶相为钙长石的纤维状结构的微晶玻璃；最佳的热处理工艺为：850 ℃核化100 min，980 ℃晶化80 min；随着热处理温度的升高，红外吸收带发生明显的分裂；玻璃结构中的[AlO4]向[AlO6]转化；网络结构中的钛离子逐渐转变为六配位，形成微晶相——钛酸镁和钛铁晶石，为晶体的生长提供非均匀形核位置。

The basic reason is that the pulse pressure, produced by the pulse current, affects the nucleation and growth of the alloy.

其主要原因是脉冲电流产生的脉冲压力对晶核的形成和长大产生了影响。

The results show that a large number of fine crystal grain are formed on the surface of a crystal nucleus eradiation equipment with cooling system while the vibrating bar of the equipment is inserted into 30% NH4Cl aqueous solution.

结果发现：当一种带有冷却结构和高频振动的晶核发射器棒体插入氯化铵溶液时，在棒体表面将迅速形成大量的细小晶粒。

It was concluded that P2O5 was an effective nucleating agent for this glass system. The nucleation density of this glass system was too low to form tiny crystal after heat-treatment, when it contained no P2O5, and the major crystal phase was lithium silicate. Adding P2O5 resulted in major tiny crystal phase of lithium disilicate after heat-treatment.

结果发现P2O5是该玻璃体系的有效成核剂，未添加P2O5的玻璃体系成核密度低，热处理后不能形成微晶体，且主晶相为硅酸锂；添加P2O5使玻璃在热处理后形成以二硅酸锂为主晶相的微晶玻璃。

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。

Many nanotwins were formed in this triangular region. HREM observations showed that nanotwinning dislocations were nucleated at noncoherent twin boundaries with the local stress concentration, and the nucleation is related to the dislocation dissociations at the boundary ledges. The proceeding of these nanotwins is the homogenous shears of 1/6 [11〓] twinning dislocations, which is that the trailing 1/6 [112] twinning dislocations repel the leading twinning dislocations to proceed in the (111) planes. Therefore, twinning dislocations at the twin tip appear to be on one side of twin, forming a noncoherent twin boundary with a semilenticular shape.

在此三角区域内发现许多纳米孪晶的存在，通过高分辨电镜手段观察到纳米孪晶中的孪生位错是在具有原位应力集中的非共格入射孪晶界上形核的，纳米孪晶的形核与界面的台阶位错及其位错分解反应有关，纳米孪晶的行进是1/6[11〓]孪生位错均匀切变机制，即每一个（111）孪生面上对应一个孪生位错，其中拖尾的1/6[11〓]孪生位错将会推动领先的孪生位错行进，于是在形变孪晶头部位置的孪生位错排列常常出现在形变孪晶的一侧界面，形成一个半透镜状的非共格孪晶界。

The Ni-S deposits obtained from bath containing sulphosalicylic have higher sulphur contents, obvious amorphous textures and much smaller grain sizes than those from the bath without additive.

结果表明，磺基水杨酸在电沉积过程中既促进了晶核的形成，又阻碍了晶粒的长大，导致Ni-S沉积层的晶粒细化、非晶态化程度和硫含量的提高。

The Ni-S deposits obtained from bath containing sulphosalicylic have higher sulphur contents, obvious amorphous textures and much smaller grain sizes than those from the bath without additive.

结果表明，磺基水杨酸在电沈积过程中既促进了晶核的形成，又阻碍了晶粒的长大，导致Ni-S沈积层的晶粒细化、非晶态化程度和硫含量的提高。

Above the transformation temperature,the director softening mechanism is dynamic recovery at low strain rate of 0.001s~(-1),dynamic recrystallization is the primary softening mechanism at 0.01-10s~(-1),and the recrystal grain generated priority at the cross point and grain boundary.

应变速率0.01-10s~(-1)变形时发生了动态再结晶以及部分α相球化，其中α相的再结晶主要与亚晶的形成、转动和聚合成核有关。

With iron carbide, we have grown diamond layers on the surface of diamond and cBN seeds. The iron carbide not only nucleated and formed diamond crystal, but also grown diamond layers on different substrate under HPHT.

以铁碳化合物为原料在金刚石和立方氮化硼籽晶表面外延金刚石的实验表明，铁碳化合物不但可以在高温高压下成核形成金刚石颗粒，而且可以在同质或者异质基底上外延生长金刚石层。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。