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采用冷坩埚悬浮熔炼技术冶炼了Cu-18%Ni、Cu-32%Ni、Cu-52%Ni和Cu-72%Ni(原子分数)4种合金铸锭,铸锭经锻造、热轧、冷轧和再结晶退火,最终获得了厚度为80μm的薄带。采用背散射电子衍射(EBSD)技术表征了合金再结晶织构,利用高分辨透射电镜(HRTEM)分析了显微组织结构。结果表明,4种Cu-Ni合金冷轧后的形变织构相似,但随着合金薄带中Ni含量增加,再结晶退火后立方织构的份额减少,晶粒取向变得散乱,晶粒尺寸明显变大;合金成分处于52%~72%Ni范围时,形变合金在回复阶段的调幅分解是引起再结晶织构散乱的主要原因,Cu-Ni合金的单相固溶体是形变-再结晶后获得立方织构的关键因素。
Four types of alloy ingots, Cu-18% Ni, Cu-32% Ni, Cu-52% Ni and Cu-72% Ni (atomic fraction), were smelted by cold crucible suspension melting. Rolling and recrystallization annealing finally obtained a strip thickness of 80μm. The recrystallization texture of the alloy was characterized by backscattered electron diffraction (EBSD) technique and the microstructure was analyzed by high resolution transmission electron microscopy (HRTEM). The results show that the textures of four Cu-Ni alloys are similar after cold-rolling. However, with the increase of Ni content in the alloy ribbons, the proportion of cubic texture after recrystallization annealing decreases and the grain orientation becomes disordered. The grain size Obviously. When the alloy composition is in the range of 52% -72% Ni, the amplitude modulation decomposition of the deformed alloy during the recovery phase is the main reason causing the recrystallization texture to be scattered. The single phase solid solution of the Cu-Ni alloy is obtained after deformation-recrystallization Cubic texture of the key factors.