通过TEM和EBSD等技术,研究Cu-3.6%Al2O3(体积分数)弥散强化铜合金细丝冷拉拔变形过程的显微组织和力学性能的演变规律.研究结果表明:Cu-3.6%Al2O3(体积分数)弥散铜合金基体内分布着大量的纳米级γ-Al2O3弥散强化相,形貌以近球状为主,还有少量尺寸为100~200 nm的呈棒状的γ-Al2O3粒子.在冷拉拔变形过程中,晶粒沿着拉拔方向拉长,硬度增加.随着拉伸的进行,合金的变形织构也在发生转变,当冷拉拔变形率达88%时,发生立方织构(Cube)和铜型织构(Copper)向黄铜织构(Brass)、高斯织构(Goss)和剪切织构(S)的转变;合金的显微组织为由位错缠结形成的带状组织和位错胞结构.
The microstructure and mechanical property evolution of Cu-3.6%Al2O3 (volume fraction) alloy fine wire during cold drawing were studied by TEM and EBSD. The results show that the massive nano-scaleγ-Al2O3 particles with near spherical like dispersively distribute on the matrix of the alloy strengthening phase, meanwhile, some rod-like particles with size of 100?200 nm also appear. During cold drawing, the grains are elongated and the hardness increases. With drawing process, the deformation texture of alloy changes, as the deformation reduction approaches 88%, the cube texture and copper texture transform to Brass texture, Goss texture andS texture. The microstructures of alloy are composed of banded structure and dislocation cell one formed by dislocation.
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