变形方式对Cu-8.3Fe-1Ag形变原位复合材料组织性能的影响

分别采用冷拉拔和冷轧变形并结合中间退火工艺,制备了丝状和带状形变Cu-8.3Fe-1Ag原位复合材料。用SEM、精密万能试验机、显微硬度计和电阻测量仪对两种变形方式下试样的微观组织、力学性能和导电性能进行了比较研究。微观组织观察表明:冷拉拔和冷轧变形试样的横截面组织形貌有显著差异,前者为基体上分布着弯曲、扭折、交叠的蠕虫状相,后者为基体上定向排列着与冷轧方向平行的平直颗粒相。力学性能和导电率测试结果表明:相同应变量下,冷拉拔变形的抗拉强度、硬度均高于冷轧变形,但二者的导电率几乎相同。应变量达到6.70时,二者的抗拉强度/硬度/导电率分别达到838 MPa/149 HV/58%IACS和924 MPa/160 HV/58%IACS。

Effect of deformation ways on microstructure and properties of deformation-processed Cu-8.3Fe-1Ag in-situ composites

Cu-8.3Fe-1Ag in-situ composites with filamentous and flaky reinforcement were prepared by cold-drawing and cold-rolling deformation.Microstructure,mechanical and electrical properties of the composites were investigated by means of SEM,tensile tests,microhardness and electrical conductivity measurements.The microstructure observation shows that the cross-sections of the filamentous and flaky reinforcing phases are significant difference.The cross-section morphology of the filamentous reinforcement Fe is vermiculate in copper matrix and the cross-section morphology of the flaky reinforcement Fe presents strip shape in the copper matrix.Tensile strength,microhardness of the Cu-8.3Fe-1Ag in-situ composites by cold-drawing is higher than that of the cold-rolled ones,however,their electrical conductivity is similar.The tensile strength,microhardness and electrical conductivity are 838 MPa,149 HV and 58%IACS,and 924 MPa,160 HV and 58% IACS,respectively,for the in situ composites prepared by cold-drawing and cold-rolling with strain of 6.7.