In this research, the feasibility of adding mechanically activated nano-crystalline Al 2 O 3 particles into aluminum matrix was investigated. For this purpose, Al 2 O 3 powder was milled in a high-energy ball mill for 20h. Subsequently, 1wt.% of Al 2 O 3 powder was added to molten Al. Then microstructure, powder characterizations and mechanical and wear properties of this composite were studied. Peak broadening of the diffraction patterns clearly showed that Al 2 O 3 crystallites were in the nanometer scale after milling. Furthermore, distributing a small amount of Al 2 O 3 particles on the aluminum matrix was a heterogeneous feature and the grain size of the matrix consequently decreased. Due to the existence of hard particles and hence smaller crystalline size, hardness, yield strength and wear resistance of Al–Al 2 O 3 composite significantly rised.
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机译：在这项研究中，研究了将机械活化的纳米Al 2 O 3纳米粒子添加到铝基体中的可行性。为此，将Al 2 O 3粉末在高能球磨机中研磨20小时。随后，将1重量％的Al 2 O 3粉末添加到熔融的Al中。然后研究了该复合材料的微观结构，粉末表征以及机械和磨损性能。衍射图的峰展宽清楚地表明，研磨后Al 2 O 3晶粒处于纳米级。此外，少量的Al 2 O 3颗粒分布在铝基质上是不均匀的特征，因此基质的晶粒尺寸减小。由于存在硬质颗粒，因此晶体尺寸较小，Al-Al 2 O 3复合材料的硬度，屈服强度和耐磨性显着提高。
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