What Are Crystals and Grains? - Materials Science & Engineering
网页2022年11月24日 · Crystals are materials that have a repeating arrangement of atoms. Single crystals, like gemstones, have a single grain so the periodic array of atoms is never interrupted. Polycrystals, like metal, have many grains which are usually too small to see. Crystal structure is one of the most basic properties of a material.
晶粒 - 维基百科，自由的百科全书
网页晶粒（crystallite、crystal grain）是指微小的或微米尺度的晶体。 多晶体由许多不同大小和取向的晶粒组成，視不同之成長與加工過程，多晶體中的晶粒取向可能都均勻地隨機分佈形成隨機織構，也可能表現出多數晶粒都朝某一特定取向，而形成特定的 擇優取向 。
Researchers unveil a secret of stronger metals | MIT News ...
网页2022年5月20日 · MIT researchers determined exactly what happens as crystal grains in metals form during an extreme deformation process, at the tiniest scales, down to a few nanometers across. The findings could lead to better, more consistent properties in metals, such as hardness and toughness.
Crystal Grain - an overview | ScienceDirect Topics
网页Normal stainless steel consists of large crystal grains with different sizes. Meanwhile, crystal grains are reduced in the fine-grained steel, which are manufactured by repeating plastic deformation and reverse phase transformation. The average grain sizes are 9.1 μm in the normal-grain steel and 1.52 μm in the fine-grain steel, respectively.
Grains and grain boundaries in highly crystalline monolayer
网页2013年5月5日 · The large-grain, highly crystalline MoS 2 monolayers, with optical properties equivalent or superior to exfoliated samples, enable new experiments studying the growth, structure and properties of...
Ultra-large-scale phase-field simulation study of ideal grain …
网页2017年7月3日 · Grain growth, a competitive growth of crystal grains accompanied by curvature-driven boundary migration, is one of the most fundamental phenomena in the context of metallurgy and other...
A novel mechanism to generate metallic single crystals
网页2021年12月29日 · The first step is a standard grain selection process due to directional solidification, leading to a pronounced fiber texture. The second and new mechanism bases on successive thermo-mechanically...
Sculpted grain boundaries in soft crystals | Science Advances
网页2019年11月29日 · Solid-solid grain boundaries—two-dimensional (2D) defects at the intersection of regions of a polycrystalline material having different orientations—are of fundamental importance in determining the bulk physical properties of crystalline solids, including ductility, strength, conductivity, and optical response (1 – 3).
New technique provides detailed views of metals’ crystal structure
网页2016年7月6日 · The method combines optical microscopy techniques (left, in pink) with electron backscatter diffraction (right, in green) to measure characteristics of the boundaries between crystal grains, which help determine the material’s overall properties. Researchers at MIT and elsewhere have developed a new combination of methods that can provide ...
From Single Crystal to Polycrystal Plasticity: Overview of Main ...
网页2022年2月26日 · This chapter provides a brief overview of the different continuum mechanics approaches used to describe the deformation behavior of either single crystals or individual grains in polycrystalline metallic materials.
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