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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Nanostructured composite obtained by mechanically driven reduction reaction of CuO and Al powder mixture
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Nanostructured composite obtained by mechanically driven reduction reaction of CuO and Al powder mixture

机译：机械驱动的CuO和Al粉末混合物还原反应获得的纳米结构复合材料

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摘要

The reduction reaction between Al and CuO hasbeen induced by ball milling of the powder mixture. The reaction,in which CuO is believed to be reduced gradually by Al, iscontrolled by diffusion of the atoms and ions. The reduced metalCu reacts with Al spontaneously to form the metastable Al_4Cu_9phase during ball milling, which transforms into the equilibriumCuAl_2 after annealing. Hot pressing is performed to synthesizethe as-received Al-5CuO alloy powders and a nearly full densitynanostructured aluminum matrix composite reinforced withCuAl_2(100-500nm in size ) and Al_2O_3, Al_4C_3 (10-50nmin size) is obtained. The mean grain size of the matrix isdetermined to be 73.6 nm by the whole-pattern least-squares fittingmethod using XRD data, further confirmed by TEM observation. Itis also found that solution of Cu in the Al matrix is inhibited dueto the presence of the fine oxide and carbide particles.Compressive tests reveal that the nanostructured compositeexhibits excellent strength both at ambient and elevatedtemperature, which is attributed to the fine dispersoids and nano-sized grain of the Al matrix.
机译：粉末混合物的球磨引起了Al和CuO之间的还原反应。 CuO被认为会逐渐被Al还原的反应是通过原子和离子的扩散来控制的。还原后的金属铜在球磨过程中与铝自发反应形成亚稳态的Al_4Cu_9相，退火后转变为平衡态CuAl_2。进行热压合成原样的Al-5CuO合金粉末，得到由CuAl_2（尺寸为100-500nm）和Al_2O_3，Al_4C_3（尺寸为10-50nmin）增强的几乎全密度的纳米结构铝基复合材料。使用XRD数据通过全图最小二乘拟合方法将基体的平均晶粒尺寸确定为73.6 nm，并通过TEM观察进一步证实。研究还发现，由于存在细小的氧化物和碳化物颗粒，Cu在Al基体中的溶解受到抑制。压缩试验表明，该纳米结构复合材料在环境和高温下均表现出优异的强度，这归因于细小的弥散体和纳米级Al基体的晶粒。

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