(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 通過TEM和EBSD等技術(shù)，研究Cu-3.6%Al2O3(體積分?jǐn)?shù))彌散強化銅合金細絲冷拉拔變形過程的顯微組織和力學(xué)性能的演變規(guī)律。研究結(jié)果表明：Cu-3.6%Al2O3(體積分?jǐn)?shù))彌散銅合金基體內(nèi)分布著大量的納米級γ-Al2O3彌散強化相，形貌以近球狀為主，還有少量尺寸為100~200 nm的呈棒狀的γ-Al2O3粒子。在冷拉拔變形過程中，晶粒沿著拉拔方向拉長，硬度增加。隨著拉伸的進行，合金的變形織構(gòu)也在發(fā)生轉(zhuǎn)變，當(dāng)冷拉拔變形率達88%時，發(fā)生立方織構(gòu)(Cube)和銅型織構(gòu)(Copper)向黃銅織構(gòu)(Brass)、高斯織構(gòu)(Goss)和剪切織構(gòu)(S)的轉(zhuǎn)變；合金的顯微組織為由位錯纏結(jié)形成的帶狀組織和位錯胞結(jié)構(gòu)。
關(guān)鍵字: Cu-3.6%Al2O3銅合金；形變織構(gòu)；顯微組織
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: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-scale γ-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 and S texture. The microstructures of alloy are composed of banded structure and dislocation cell one formed by dislocation.
Key words: Cu-3.6%Al2O3 alloy; deformation texture; microstructure
