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Share the properties of amorphous materials-

by:Transmart     2022-12-29

As a rigid solid with a special structure, metallic glass has higher strength than ordinary metals (such as amorphous Fe80B20, the fracture strength σF reaches 37kgf/mm, which is more than seven times that of ordinary structural steel); and the size effect of strength is very large. small. Its elasticity is also better than ordinary metals, and its bending deformation can reach more than 50%. The hardness and toughness are also very high (Vickers hardness HV is generally around 1000-2000). The corrosion resistance of low-chromium-containing iron-based metallic glass (such as Fe27Cr8P13C7) is far better than that of stainless steel. Due to the long-range disorder of the atomic arrangement, the contribution of phonons to the scattering of conduction electrons is very small, so that the resistivity is very high, generally above 100 μΩ cm at room temperature, and the temperature coefficient of resistivity is very small (less than ±10K); in It has high residual resistance at 0K. In some amorphous alloys (such as PdSiCr), the resistance has a minimum value when the resistance temperature curve T=Tm, when T<At Tm, the resistance increases with decreasing temperature, similar to the Kondo effect in crystalline dilute alloys, and the mechanism is unclear. There are 15 kinds of amorphous quenched superconducting alloys that have been reported, and their superconducting transition temperature is 1.5-8.71K, which is lower than that of crystalline superconductors, and its characteristic is that the radiation resistance is much stronger than that of crystalline states. Metallic glasses based on transition metals (iron, cobalt, nickel) have excellent soft magnetic properties (see magnetic materials), high magnetic permeability and low AC loss, far superior to commercial silicon steel sheets, comparable to permalloy, Such as (Fe4Co96) (P16B6Al3) amorphous alloy coercive force Hc≈0.13Oe, remanence Br≈4500G, may be widely used in high and low frequency transformers (partially replace silicon steel sheet and Permalloy), magnetic sensors, recording Magnetic heads, magnetic shielding materials, etc. After research, the internal structure of glass does not have the characteristics of 'space lattice', but is similar to the structure of liquid. It's just that the 'like crystal regions' cannot move with each other, causing the glass to have no fluidity. We refer to this state as 'amorphous'. Strictly speaking, 'amorphous solid' is not a solid, because a solid refers to a crystal; it can be regarded as a very viscous liquid. Therefore, 'amorphous state' can be proposed as another state of matter. In addition to ordinary glass, there are many 'amorphous' solids, such as rubber, paraffin, natural resin, asphalt, and polymer plastics.
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