Microstructure and Mechanical Properties of Commercially Pure Aluminum Processed by Equal Channel Angular Expansion Extrusion with Spherical Cavity (ECAEE-SC)

作者：Wang Xiaoxi^*; Zhang Xiang; Huang Chuanhui; He Min

来源：Rare Metal Materials and Engineering, 2018, 47(6): 1901-1905.

• combined severe plastic deformation
• equal channel angular expansion extrusion with spherical cavity (ECAEE-SC)
• commercially pure aluminum
• microstructure
• mechanical property

Commercially pure aluminum (1060 Al alloy) was subjected to equal channel angular expansion extrusion with spherical cavity (ECAEE-SC) for 1 pass at room temperature. The microstructure development of pure aluminum during processing was investigated using optical microscopy (OM) and electron backscattered diffractometry (EBSD). In addition, the microhardness measurements and tensile tests were conducted for mechanical testing. The results show that the ECAEE-SC process is capable of combined severe plastic deformation and shows high extrusion efficiency; the billet has successfully achieved continuous deformation in a single pass. After 1 pass of ECAEE-SC process, the grains are significantly broken and refined under the combined action of mechanical shear, strain accumulation and hydrostatic pressure. A large number of fine homogeneous equiaxed subgrains form, whose average grain size is 4.6 mu m. Also, the extruded materials show excellent comprehensive mechanical properties. The HV microhardness increases from 366 MPa to 702 MPa with uniform distribution, more than 91.8% improvement over the as-cast condition. The tensile strength is up to 183.8 MPa, while the elongation decreases to 12.7%. The tensile fracture morphology exhibits remarkable ductile fracture characteristics.

• 出版日期2018-6
• 单位徐州工程学院; 中国矿业大学（北京）