Effect of Rotary Extrusion Process on Microstructure and Properties of Heat-resistant Aluminum Alloy
In order to improve the mechanical properties of Al-Si-Fe alloy,a rotary extrusion process is designed in this paper.At the same time of forward extrusion,the material produces a certain pure shear deformation through the rotation of the die.The superposition of deformation can not only refine the structure but also break the original boundary of the alloy powder particles.In the subsequent sintering,a better metallurgical bonding between the particles can be achieved,thereby improving the mechanical properties of the material and achieving continuous preparation of the material.The results show that the density of the alloy material sintered by rotary extrusion reaches 97%of the theoretical density,which is 2.70 g/cm3,the microhardness is 160 HV,and the tensile strength is 396 MPa.
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