Abstract:The quasi- crystal is a rotational symmetric solid with a structure between the crystalline and amorphous state. Due to its special structure, the strength, hardness and brittleness of quasi- crystal are very high at room temperature, and its stick- ability, friction coefficient, density and thermal conductivity are low. For the quasi- crystal steel, numerous quasi- crystal precipitates are formed, resulting in the tensile strength as high as 3 000 MPa. Based on the discovery of quasi- crystal and the quasi- crystal in steel, the influencing factors on the phase transition of quasi- crystal steel are discussed, the properties and preparation of quasi- crystal strengthened steel and the properties of the quasi- crystal in steel are summarized. Finally, the present situation and existing problems of quasi- crystal steel and quasi- crystal are analyzed, and the potential applications and future research direction of quasi- crystal steel are prospected.
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