High-energy ball milling was carried out to disperse 3 vol% TiC nanoparticles (ex situ reinforcement) in a high-pressure inert gas-atomised prealloyed micron-sized 6005A Al alloy (AA6005A), with a Si/Mg atomic ratio of 1.32 powder matrix. Nanocomposite powders were consolidated by hot extrusion in strip shape at 500 °C, followed by a T6 ageing heat treatment. The microstructural features of the consolidated and precipitation hardening nanocomposites specimens were studied using X-Ray diffractometry (DRX), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD). The consolidated nanocomposites consisted of approximately equiaxed grains of different grain sizes with a high fraction of high-angle grain boundaries with average misorientation angles of approximately 35°. The nanocomposites showed remarkably higher hardness, Young’s modulus, yield, and ultimate strengths at room temperature than the extruded profiles of unreinforced milled AA6005A powders obtained through refinement of the Al alloy grain structure and a strong particle–matrix bonding, although with a drop in their ductility. The consolidated nanocomposite showed a weak response to industrial ageing heat treatment, as demonstrated by microstructural analyses and mechanical tests.

中文翻译：

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TiC纳米颗粒增强并通过沉淀硬化强化的挤压6005A铝合金复合材料的组织和力学性能

进行高能球磨，将3％（体积）的TiC纳米颗粒（非原位增强）分散在高压惰性气体雾化预合金微米级6005A铝合金（AA6005A）中，Si / Mg原子比为1.32粉末矩阵。纳米复合粉末通过在500°C下热挤压成条状而固结，然后进行T6时效热处理。使用X射线衍射（DRX），差示扫描量热法（DSC），扫描电子显微镜（SEM），透射电子显微镜（TEM）和电子背散射衍射（EBSD）研究了固结和沉淀硬化的纳米复合材料标本的微观结构特征。固结的纳米复合材料由不同晶粒尺寸的近似等轴晶粒组成，具有高比例的高角度晶界，平均取向差角约为35°。纳米复合材料在室温下的硬度，杨氏模量，屈服强度和极限强度明显高于通过细化铝合金晶粒结构和牢固的颗粒-基体结合而获得的未经增强的研磨AA6005A粉末的挤出轮廓，尽管它们的含量有所下降延展性。固结的纳米复合材料对工业时效热处理表现出较弱的响应，如微观结构分析和力学测试所证实。以及在室温下的极限强度，这是通过细化铝合金晶粒结构和牢固的颗粒-基体结合而获得的未增强的研磨AA6005A粉末的挤出轮廓，尽管延展性有所下降。固结的纳米复合材料对工业时效热处理表现出较弱的响应，如微观结构分析和力学测试所证实。以及在室温下的极限强度，这是通过细化铝合金晶粒结构和牢固的颗粒-基体结合而获得的未增强的研磨AA6005A粉末的挤出轮廓，尽管延展性有所下降。固结的纳米复合材料对工业时效热处理表现出较弱的响应，如微观结构分析和力学测试所证实。