【摘要】 通过冷变形拉拔结合中间热处理,制备了纤维相增强的Cu-12Ag(质量分数, ％)合金,采用不同温度退火研究了合金导电性能和抗拉强度随显微组织变化的关系.合金双相纤维复合组织在200℃热处理时无明显变化,强度略有降低,硬度和导电性能略有升高;当热处理温度超过400℃时,纤维组织演变为晶粒沿变形方向排列的等轴组织,合金强度及硬度显著下降,电导率显著上升.在热处理过程中,如果再结晶晶粒仅局限于原纤维组织内部生长而使得整体组织仍能保持完整的纤维形态,则合金能够表现出良好的强度与导电性匹配.更多还原

【Abstract】 Cu-12Ag (mass fraction, %) filamentary composite was prepared by cold drawing combined with intermediate heat treatments. The microstructure, mechanical properties and elec trical conductivity were investigated for the heavy drawn alloy subjected to annealing at different temperatures. For the alloy annealed at 200 ℃, the microstructure shows an insignificant change or basically retains the morphology of double-phase fibers formed during cold deformation. The strength slightly decreases while the hardness and conductivity slightly increase. For the alloy annealed at above 400 ℃, the filamentary microstructure evolves into the equiaxial grains aligned along the wire axis. The strength and hardness significantly decrease while the conductivity significantly increases. It is possible to obtain the expected combination of better strength and conductivity for the alloy when the propagation of recrystallized grain is limited inside the fibrous phases and the morphology of complete filamentary can still be kept down during annealing at a suitable temperature.更多还原