Research progress on microstructure and properties of Invar alloy
The expansion and contraction of material caused by the change of ambient temperature is a common problem for precision instruments,optical components,aerospace equipment,etc.Due to the low coefficient of thermal expansion of less than 2.0 ppm/℃ at Curie temperature of 230 ℃ or below,Invar alloys have extremely high dimensional stability,and this unique property makes Invar alloys have an excellent advantage in the field of high-precision and high-stability dimensional change.However,combined with the actual working conditions and specific application environments,Invar alloys need to have other functions,such as high strength,magnet-ism,damping,etc.,under the condition of low expansion characteristics,in order to meet the diversified needs for material properties in different fields.In order to promote the in-depth study of Invar alloys,this paper pro-vides a comprehensive evaluation of the research progress of Invalid alloys,focusing on the six aspects of the strengthening pathways of Invar alloys,namely,precipitation strengthening,deformation strengthening,mag-netism,damping,electrodeposition,and additive manufacturing,and puts forward some opinions on the direc-tion of its development in the hope of providing a certain reference value for the future optimization of Invar al-loy properties.
Invar alloycoefficient of thermal expansiondimensional stabilitystructure property
万方数据
维普
