The Effect Of Deformation Temperature On Deformation Mechanism Of Mg-Al-Ca-Mn Alloy

With the increasing concern of energy issues and pollution issues by the international community,the scope of application of light metals has increased,at the same time,the demand for high-performance light metals has also increased.The research and development of new light metal materials at home and abroad attach great importance.The research,development and application of light metal materials in China have become one of the key materials for development during the 13 th Five-Year Plan period.Among the light metal materials,magnesium and its alloys are currently the most widely used in engineering applications,and they have received the attention of researchers as the lightest structural material.Due to its low density,good stiffness,and highest strength-to-weight ratio,it is increasingly used in the automotive and aerospace industries.However,due to the low tensile strength and poor ductility of magnesium alloys,the processing and application of magnesium alloys are also greatly limited.Increasing the mechanical properties of magnesium alloys has become a hot spot and focus of light metal materials research.In order to realize the high performance of magnesium alloys,it is the most basic work to study the deformation behavior of the magnesium alloys and then to explore the corresponding deformation mechanism.Therefore,the Mg-Al-Ca-Mn alloys are studied in this paper,and the stress-strain behavior and corresponding deformation mechanism of the alloys under different deformation temperatures are systematically analyzed.The experimental results show that the Mg-Al-Ca-Mn alloy exhibits a lower yield strength at low temperature deformation,but after the plastic deformation starts,it achieves higher tensile strength and greater plastic deformation with a nearly constant work hardening rate.However,when the deformation temperature is higher than the critical temperature,the yield strength increases,but the work hardening rate decreases significantly with increasing temperature,and above 400°C,there is almost no apparent work hardening,that is,the plastic deformation behavior of the hot tensile of the magnesium alloy is affected by the deformation temperature.At the same time,theexperimental results show that the deformation temperature strongly influences the microstructure of the material.At low temperature,the main microstructure of Mg-Al-Ca-Mn alloy is twin.With the increase of temperature,slip becomes the dominant plastic deformation mechanism.The main microstructure of the alloy is dynamic recrystallization.