Cu-15Fe-0．1Zr原位复合材料组织和性能的研究

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Filamentous and ribbon deformation-processed Cu-15Fe-0. 1 Zr in-suit composites have been prepared by using melting and forging method in air and the cold-drawing and cold-rolling deformations. The microstrueture, tensile strength and electrical conductivity of deformation-processed Cu-15Fe-0. 1Zr in-suit composites are investigated with a scanning electron microscope （SEM）, a precise universal testing machine and a resistance meter. The microstructure observations show significant differences in the cross-sections of filamentous and ribbon materials. The cross-section morphology of wires shows that the vermieulate second phase Fe is evenly distributed like worms on the copper matrix, while the cross-section morphology of ribbon materials shows slightly curved long strips of the second phase Fe distributed in parallel to the rolling distributing on the copper matrix. The testing results of tensile strength and electrical conductivity show that the tensile strength and electrical conductivity of wires are higher than the strips. The maximum tensile strength is obtained to be 751 MPa for wires and 496 MPa for strips at 400 ℃ aging temperature and the strain of 2.77.The maximum electrical conductivity is obtained to be 50.6% IACS and 49.8% IACS at 500 ℃ aging temperature and the strain of 2.77. The materials start to soften when the aging temperature is at 550 ℃.用大气熔铸法结合冷拔、冷轧两种变形方式，制备了丝状和带状形变Cu．15Fe-0．1Zr原位复合材料．用扫描电子显微镜、精密万能试验机和电阻测量仪对其微观组织、抗拉强度和导电性能进行了研究．微观组织观察表明：经拉拔和轧制所制备的线材和带材的横截面组织形貌有明显差异，带材的横截面形貌为铜基体上均匀分布着蠕虫状第二相Fe；而带材的横截面组织形貌为铜基体上定向分布着与轧制方向平行的略有弯曲的长条状第二相Fe．抗拉强度和导电率的测试结果表明：相同应变量和相同退火温度下，线材的抗拉强度和导电率均高于带材；当应变量为2．77，退火温度为400oC时，二者的抗拉强度达最大值，分别为751MPa和694MPa；退火温度为500℃时，二者的导电率达最大值，分别为50．6％IACS和49．8％IACS；退火温度为550oC时，材料开始软化．