借助S4800扫描电子显微镜、Philips DM420透射电子显微镜、SANS CMT5105电子万能材料试验机和QJ48双臂直流电桥,研究了多道次ECAE动态成型Al-Mg-Si合金导线的组织与性能.结果表明:4道次ECAE动态成型可制备平均尺寸在10 μm左右甚至更小的Al-Mg-Si合金导线晶粒.随着Mg、Si含量的增加,合金导线的抗拉强度增大,伸长率与等效导电率降低.经160~170 ℃/7 h时效处理后,Al-0.59%Mg-0.59%Si合金导线的抗拉强度、伸长率和等效导电率分别为305.71~309.63 MPa,4.7%~5.4%和55.18%IACS~56.33%IACS,与目前国产Al-Mg-Si合金导线(295 MPa,52.5%IACS)相比,导电性能显著提高.
The microstructure and properties of Al-Mg-Si alloy conducting wire prepared by multi-pass ECAE process were studied by means of S4800 scanning electron microscope (SEM), Philips DM420 transmission electron microscope (TEM), SANS CMT5105 electronic universal material testing machine and QJ48 double arm DC bridge.The results show that the grain of Al-Mg-Si alloy conducting wire with an average size of 10 μm or even smaller can be prepared by 4 passes ECAE dynamic forming.The tensile strength of the conducting wire increases with the increase of Mg, Si contents, however, the elongation and equivalent decrease.After soaked at 160-170 ℃ for 7 h, tensile strength, elongation and equivalent conductivity of the Al-0.59%Mg-0.59%Si alloy conductor were about 305.71-309.63 MPa, 4.7%-5.4% and 55.18%IACS-56.33%IACS, respectively.Hence the electric conductivity properties of the Al-Mg-Si alloy conductor are greatly improved compared to traditional Al-Mg-Si alloy conductor (whose tensile strength and equivalent conductivity are 295 MPa and 52.5%IACS, respectively).
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