A method of pre-regulating the lamellar long-period stacking ordered(LPSO)phase was introduced to enhance the hot plasticity of rare earth magnesium alloys.Additionally,low-temperature extrusion was used to achieve a ...A method of pre-regulating the lamellar long-period stacking ordered(LPSO)phase was introduced to enhance the hot plasticity of rare earth magnesium alloys.Additionally,low-temperature extrusion was used to achieve a comprehensive improvement of alloy performance with small deformation,providing a new approach for the preparation of high-performance large components.The strengthening−toughening mechanism under low-temperature extrusion with an extrusion ratio of 3.6꞉1 was investigated by comparing the microstructure and performance of pre-regulated Mg−Gd−Y−Zn−Zr alloy at three different extrusion temperatures(420,450,and 480℃).Results show that the alloy extruded at 420℃exhibits a yield strength of 341 MPa,tensile strength of 419 MPa,and elongation of 7.2%.The increase in strength is mainly caused by the strong texture and internal dislocation pinning of the undynamic recrystallization(un-DRX)zone,and a lower volume fraction ofβdynamic precipitation phase is beneficial to improving the ductility of the alloy.展开更多
基金financial support by the Innovative Talents Support Program of Higher Education Institutions in Shanxi Province,China,and Project of Science and Technology by the North University of China in 2022(No.20221878).
文摘A method of pre-regulating the lamellar long-period stacking ordered(LPSO)phase was introduced to enhance the hot plasticity of rare earth magnesium alloys.Additionally,low-temperature extrusion was used to achieve a comprehensive improvement of alloy performance with small deformation,providing a new approach for the preparation of high-performance large components.The strengthening−toughening mechanism under low-temperature extrusion with an extrusion ratio of 3.6꞉1 was investigated by comparing the microstructure and performance of pre-regulated Mg−Gd−Y−Zn−Zr alloy at three different extrusion temperatures(420,450,and 480℃).Results show that the alloy extruded at 420℃exhibits a yield strength of 341 MPa,tensile strength of 419 MPa,and elongation of 7.2%.The increase in strength is mainly caused by the strong texture and internal dislocation pinning of the undynamic recrystallization(un-DRX)zone,and a lower volume fraction ofβdynamic precipitation phase is beneficial to improving the ductility of the alloy.
