组合时效对高强导电Cu-Ti-Fe-Cr合金箔组织与性能的影响

Microstructure and Properties Evolution of High-strength Conductive Cu-Ti-Fe-Cr Alloy Foils Treated by Combined Aging Process

采用硬度、导电率测试和OM、SEM观察等方法,研究了组合时效对时效强化型Cu-3Ti-0.2Fe-0.2Cr合金箔组织与性能的影响。结果表明,经过900℃固溶4 h后水冷+50%初冷轧+450℃初时效4 h+95.6%终冷轧+450℃再时效1.5 h后,Cu-3Ti-0.2Fe-0.2Cr合金箔的综合性能最优,硬度、抗拉强度、延伸率和导电率分别为3546 MPa、1062 MPa、1.9%和17.1%IACS,与未经初时效样品的峰时效性能相比,其力学性能相近,并具有更高的导电率,该状态下合金箔的断口形貌为扁平面、河流状花样和韧窝组成的混合断裂形貌。

Effects of combined aging process on microstructure and properties of age-hardenable Cu-3Ti-0.2Fe-0.2Cr alloy foils were investigated by hardness test, tensile test, conductivity test, OM and SEM. Results show that after the optimized combined aging treatment of pre-rolling with the reduction of 50%, pre-aging at 450℃ for 4 h, re-rolling with the reduction of 95.6% and re-aging at 450℃ for 1.5 h, the hardness, tensile strength, elongation and electrical conductivity of Cu-3Ti-0.2Fe-0.2Cr alloy foil are 3546 MPa, 1062 MPa, 1.9% and 17.1%IACS, respectively. Compared with the specimen treated with Pre-0h+CR+Re-2 h, the alloy foil treated with optimized combined aging process has similar mechanical properties but higher electrical conductivity. The fractograph of the studied alloy foil treated with optimized combined aging process is composed of flat facets resembling cleavage, river pattern and dimples, manifesting a mixed-rupture mode.