坯

The rate of equiaxed crystals is increased with electric current.

选择合适的电磁搅拌参数可以获得良好的铸坯质量。

Findings indicate that deposit state mostly from by equiaxed grain and the average diameter is 22μm.

研究结果表明，沉积坯主要由等轴晶构成，晶粒平均直径为22pm。

Mainly research results are:(1) Through electromagnetic stirring the crystal grain has been thined and the equiaxed rate enhanced from 85% to 93%.

主要研究结果为：(1)铸坯等轴晶率从未搅拌的平均85%左右提高到电磁搅拌后的平均93%左右。

On the condition of reasonable electromagnetic stirring and casting parameters, the billet can be obtained with almost all equiaxed grains.

在合理的电磁搅拌参数和浇铸参数条件下能够得到几乎为100%等轴晶的铸坯。

In order to increase proportion of equiaxed grain of billet and homogeneity of solidification structure,a great many liquid metal nucleation stirred by vibration experiments were carried out with zinc.

为提高铸坯的等轴晶率和凝固组织的均匀性，以金属锌为研究对象进行了大量的振动激发金属液形核实验。

It was found that more segregations of C, P, S and Mn occurred at the boundaries between the columnar grains and equiaxed grains.

研究中发现，在铸坯柱状晶与中心等轴晶带的边界处，C、F、S、Mn发生较大的正偏析。

The rapid coarsing of precipitates at powder surface through surface diffusion and its application in the improvement of the fracture properties of hipped Rene'95 will be not only important in theory, but also in practice.

粉末表面析出物通过表面扩散快速粗化，以及利用这种粗化改善粉末压坯的断裂性能的发现有很大的实用价值，为利用预处理方法解决Rene′95粉末高温合金中的原始颗粒边界问题，生产低成本高性能的粉末材料奠定了理论基础。

The comparison of composition and precipitates between PHT powder surface and PPB of hipped material, and also the fracture analyses of directly hipped material have shown that the PHT of powder modifies the PPB behavior.

本文通过对预处理表面和热等静压界面成分、析出相结构的对比分析及热等静压压坯的断裂分析，发现了预处理改善原始颗粒边界析出的机理。

The structures and composition of the precipitates at PHT powder surface and at PPB of hipped materials are investigated. The formation of PPB precipitation is directly related to the surface conditions of as-atomized powder. Precipitates at PPB are mainly MC carbides and ZrO〓.

预处理粉末表面及压坯原始颗粒边界的表面成分及析出相分析表明，原始颗粒边界析出的形成是与雾化粉末表面状况直接相关的，表面或界面析出相主要是MC型的碳化物和ZrO〓。

The esterification reactions between organic acids and the hydroxy groups of alumina powder surfaces change the polar hydroxylic surface structure that causes agglomeration of powders into an organic layer surface structure with a modified monomoleculer layer of aliphatic chains.

压制成型以其工艺简单、效率高、成本低、自动化程度高等优点而在传统陶瓷和高性能陶瓷制造中始终占有重要地位。影响坯体均匀性和致密度的因素很多，如粉体的粒度、形状、表面状态，粉体间的相互作用和流动性，成型加压制度等[1] 。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。