What is Amorphous metal?
Polycrystalline grains of varying shapes and sizes
Misaligned planes of atoms slip past each other easily, absorbing energy and allowing dislocations to move, making deformation permanent.
Grain boundaries represent weak spots
Also called Metallic glasses or glassy metals
Cooled faster than atoms can rearrange into a crystal.
Dislocation movement obstructed s
BulkGibbs free energy of formation of the amorphous oxide islarger than that of the corresponding crystalline oxide.
Thin filmThe thin amorphous metal-oxide film on its metal substrate can be stable modification with respect to the corresponding crystalline metal-oxide film the same substrate.
1. Interaction contribution to the - interfacial energy
Following the treat
Abstract
DSC is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference are measured as a function of temperature. Differential scanning calorimetry can be used to measure a number of characteristic properties of a sample.
Glass transitions may occur as the temperature of an amorphous solid is increased. Th
solid): 구성 성분이 매우 규칙적인 배열을 함.
비결정성 고체 (amorphous solid): 구조가 상당히 무질서 함.
단위 세포 (unit cell)
- 결정성 고체에서 구성성분(원자,이온,분자)들의 위치를 지정하는 점들로 이루어진
삼차원 계이며, 격자의 반복되는 가장 작은 단위
격자(lattice)
- 단위 세포를 모든 삼차원 방향으
solid and isotropic (amorphous) fluid.
Tm is the temperature at which the LCP changes from a solid (nematic structure) to an organized fluid.
Structure of solid and nematic fluid are similar (low heat of fusion)
Because of high chain stiffness and chain regularity, LCP have rod like structure retained in the melt as well as strong orientation in the melt.
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