铜包铝线材室温拉变形后的显微组织和力学性能

研究经室温拉变形后的纯铜包覆铝合金的不同线径的线材的显微组织及力学性能。结果表明:显微组织自原始的等轴晶变为细长条纤维状,纤维直径与形变量近似地成反比,纤维长度与形变量的平方近似地成正比;经室温拉变形的铜包铝线的极限抗拉强度随形变量增大而增大,与形变量平方根呈直线关系;延伸率随形变量增大逐渐降低,但延伸率波动较大。根据原始纯铜和合金铝的极限抗拉强度值,可以用复合材料强度的混合法则近似地预测不同线径的铜包铝线的极限抗拉强度。

Microstructure and mechanical properties of copper clad aluminum wire by drawing at room temperature

The microstructure and mechanical properties of pure copper clad aluminum wires in different diameters by drawing at room temperature were studied.The results show that the microstructure of the cladding wire by drawing at room temperature is vimineous grain as fibril shape from prime equiaxed grain.The fibril diameter is in inverse proportion to deformation and the fibril length is in direct proportion to the square of deformation approximately.The ultimate tensile strength of the cladding wire by drawing at room temperature goes up in direct proportion to square root of deformation,whereas the elongation decreases and fluctuates.Based on the ultimate tensile strength of prime pure copper and alloy aluminum,the ultimate tensile strength of the cladding wires with different diameters can be doped out by mix principle of composite material.