Effects of Annealing on Microstructure and Properties of Cu-00Cr20Al6 Composite Wire
Cu-00Cr20Al6 composite bars were manufactured by the process of surface plating copper coating and hot melt press roll copper strip,and then the φ4.0 mm Cu-00Cr20Al6 composite wire was obtained by cold pull machining.The effect of annealing treatment on the properties of composite wire was studied by optical microscope,X-ray diffractometer,HV-1000A hardness tester and MTS tensile testing machine.The results show that the grain size of the tensile Cu-00Cr20Al6 composite wire is 15-20 nm,and the grain size of the annealed wire can reach 10-15 µm.The Vickers hardness of copper layer and 00Cr20Al6 alloy wire is 290.4 and 384.3 HV respectively,the hardness in tensile state is higher.When the annealing holding time is 10 min,the hardness of copper layer decreases to 50 HV after annealing above 560 ℃.When it is annealed above 680 ℃,the hardness of 00Cr20Al6 alloy wire decreases greatly,and the hardness decreases below 250 HV.When 00Cr20Al6 wire is annealed below 620 ℃,its microstructure is mainly silk texture,while it is annealed above 680 ℃,the microstructure of 00Cr20Al6 wire transforms from silk texture to equiaxed grain by recrystallization.After annealing in the range of 680-740 ℃ and holding for 10 min,the tensile strength of Cu-00Cr20Al6 composite wire is less than 500 MPa,and its elongation after breaking is more than 20％.The tensile strength and elongation reach the best match of plastic processing.
万方数据
维普
