polycrystal

简明释义

英[ˌpɒlɪˈkrɪst(ə)l]美[ˌpɒliˈkrɪstl]

n. [晶体] 多晶体

英英释义

单词用法

同义词

反义词

例句

1.The TEM analysis shows that the matrix of composite coating is polycrystal nickel with the finer grain size, and the organization structure is homogeneous and compact.

TEM分析表明：复合镀层的基体为多晶镍，并且复合镀层晶粒细小，组织结构均匀、致密。

2.Thus, the single-crystal manufacturing apparatus can shorten the melting time period of the polycrystal thereby to shorten the cycle time and to reduce the production cost and the power cost.

由此，能够缩短多晶的熔融时间而缩短周期，能够提供一种单晶制造装置，可降低生产成本，同时能够降低电力成本。

3.The microstructure and phases present in hydroxyapatite(HA) reinforced by tetragonal zirconia polycrystal (TZP) were investigated by using transmission electron microscopy(TEM).

用透射电子显微镜对四方氧化锆多晶（TZP）增韧羟基磷灰石（HA）复合材料的微观相结构进行了观察与分析。

4.This paper discusses a few quality problems encountered in the manufacturing of polycrystal diamond composites(PDC), the reasons that causes the problem and the ways to solve them.

本文报道了在研制多晶金刚石复合材料（PDC）时碰到的一些质量问题及其造成的原因和解决办法。

5.However, there is not any report on the relationship between grain edge length and its neighboring ensemble grains edge length average in the polycrystal.

三维个体晶粒棱长是描述晶粒尺寸的重要参量，多晶体中晶粒及其邻接晶粒的棱长之间的关系至今仍是空白。

6.The nanometer tetragonal polycrystal zirconia powder was prepared by the super alkaline method at low temperature.

利用低温超强碱法制备出了纳米四方多晶氧化锆粉体。

7.Numerical calculation shows that the constitutive model given here can well simulate the behavior of polycrystal MT.

数值计算结果表明该本构模型能较好模拟多晶材料的马氏体相变本构曲线形态。

8.The mechanical properties of a polycrystal 多晶体 are significantly influenced by its grain boundaries.

一个多晶体的机械性能受其晶界的显著影响。

9.Researchers studied the thermal conductivity of the polycrystal 多晶体 to improve energy efficiency in materials.

研究人员研究了多晶体的热导率，以提高材料的能效。

10.The fracture mechanics of a polycrystal 多晶体 are complex due to the interaction between grains.

由于晶粒之间的相互作用，多晶体的断裂力学是复杂的。

11.During the experiment, we observed how the polycrystal 多晶体 structure affects light scattering.

在实验过程中，我们观察到多晶体结构如何影响光散射。

12.In metallurgy, the strength of a polycrystal 多晶体 can be enhanced through grain refinement.

在冶金学中，通过细化晶粒可以增强多晶体的强度。

作文

The study of materials science has led to significant advancements in various fields, particularly in understanding the properties of metals and other crystalline structures. One important concept in this domain is that of a polycrystal, which refers to a solid material composed of numerous small crystals or grains. Each grain within a polycrystal can have different orientations, which plays a crucial role in determining the material's overall mechanical properties. This essay will explore the significance of polycrystals in materials science, their formation, and their applications in modern technology.To begin with, it is essential to understand how polycrystals form. When a metal is cooled from its molten state, it undergoes crystallization. During this process, multiple nuclei form, and as they grow, they collide with one another, leading to the formation of grains. The boundaries between these grains are known as grain boundaries, and they are critical in influencing the physical properties of the material. For instance, the size and distribution of grains in a polycrystal can affect its strength, ductility, and resistance to deformation.One of the most significant advantages of polycrystalline materials is their ability to withstand stress. The presence of grain boundaries can impede the movement of dislocations, which are defects in the crystal structure that contribute to plastic deformation. As a result, polycrystalline materials often exhibit higher yield strengths compared to their single-crystal counterparts. This property makes them ideal for various structural applications, such as in the construction of buildings, bridges, and vehicles.Moreover, polycrystals play a vital role in the development of advanced materials used in technology. For example, in semiconductor manufacturing, the performance of devices is heavily influenced by the quality of the polycrystalline silicon used. High-quality polycrystalline silicon can enhance the efficiency of solar cells, making them more effective in converting sunlight into electricity. Additionally, the use of polycrystalline materials in batteries can improve energy storage capabilities, leading to longer-lasting power sources for electronic devices.In the realm of research, scientists continue to investigate the properties of polycrystals to develop new materials with tailored characteristics. By manipulating the grain size, shape, and orientation, researchers can engineer polycrystalline materials that meet specific requirements for various applications. For instance, ultrafine-grained polycrystals have shown remarkable strength while maintaining good ductility, making them suitable for applications in aerospace and automotive industries.In conclusion, the study of polycrystals is fundamental to materials science and engineering. Their unique properties, resulting from the arrangement and interaction of individual grains, make them indispensable in a wide range of applications. As technology continues to advance, the importance of understanding and optimizing polycrystalline materials will only grow, paving the way for innovations that enhance our daily lives. By delving deeper into the world of polycrystals, we can unlock new potentials in material design and application, ultimately leading to a more sustainable and efficient future.

材料科学的研究在各个领域都取得了重大进展，特别是在理解金属和其他晶体结构的性质方面。这个领域中的一个重要概念是多晶体，它指的是由许多小晶体或晶粒组成的固体材料。每个多晶体中的晶粒可以具有不同的取向，这在决定材料的整体机械性能方面起着至关重要的作用。本文将探讨多晶体在材料科学中的重要性、它们的形成以及在现代技术中的应用。首先，了解多晶体如何形成至关重要。当金属从熔融状态冷却时，它会经历结晶过程。在此过程中，多个核形成，并随着它们的生长相互碰撞，从而导致晶粒的形成。这些晶粒之间的边界称为晶界，它们在影响材料的物理属性方面至关重要。例如，多晶体中晶粒的大小和分布可以影响其强度、延展性和抗变形能力。多晶体材料最显著的优势之一是它们能够承受应力。晶界的存在可以阻碍位错的运动，位错是晶体结构中的缺陷，会导致塑性变形。因此，多晶体材料通常表现出比单晶材料更高的屈服强度。这一特性使它们非常适合用于各种结构应用，例如建筑物、桥梁和车辆的建设。此外，多晶体在现代技术中所使用的先进材料的发展中也发挥着至关重要的作用。例如，在半导体制造中，器件的性能受到所使用的多晶硅质量的严重影响。高质量的多晶硅可以提高太阳能电池的效率，使其在将阳光转化为电能方面更有效。此外，在电池中使用多晶体材料可以改善储能能力，从而为电子设备提供更持久的电源。在研究领域，科学家们继续研究多晶体的性质，以开发具有特定特征的新材料。通过操纵晶粒的大小、形状和取向，研究人员可以设计出满足各种应用要求的多晶体材料。例如，超细晶粒多晶体显示出卓越的强度，同时保持良好的延展性，使其适合于航空航天和汽车工业的应用。总之，多晶体的研究是材料科学和工程的基础。由于单个晶粒的排列和相互作用导致其独特的性质，使其在广泛的应用中不可或缺。随着技术的不断进步，理解和优化多晶体材料的重要性只会增加，为促进增强我们日常生活的创新铺平道路。通过深入研究多晶体的世界，我们可以解锁材料设计和应用的新潜力，最终导致一个更可持续和高效的未来。