Research Progress of Low Thermal Strain Magnesium Alloys

Magnesium and magnesium-based alloys are important lightweight metal materials, which are widely used in automobile, communication, aviation, aerospace and other fields. Due to the high thermal expansion coefficient of magnesium alloy, the assembly precision and mechanical properties of magnesium alloy are easily reduced when it is applied to precision devices. Therefore, low thermal strain magnesium-based materials need to be developed to meet the requirements of related applications. In this paper, the methods and principles of reducing the thermal expansion coefficient of magnesium alloy were reviewed, such as alloying, composite materials and special processing technology. The methods of reducing the thermal expansion coefficient of magnesium alloys, such as alloying with high melting point elements, doping with high hardness particles, doping with fibers with low thermal expansion coefficient and heat treatment combined with extrusion processing, were summarized, and the future research trends in this field were prospected.