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首页> 外文期刊>Materials Science and Engineering >Experimental investigation on the effect of process environment on the mechanical properties of AA5083/Al_2O_3 nanocomposite fabricated via friction stir processing
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Experimental investigation on the effect of process environment on the mechanical properties of AA5083/Al_2O_3 nanocomposite fabricated via friction stir processing

机译：工艺环境对摩擦搅拌法制备AA5083 / Al_2O_3纳米复合材料力学性能影响的实验研究

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摘要

Friction stir processing, a lately devised grain refining and also microstructure homogenizing technique, has extensively been used on aluminum alloys. Significance of limiting the grain growth during the process, has made lots of researchers make endeavor to keep, as one of the ways of controlling grain growth, the process temperature low; one way of doing so, is performing the friction stir process under water, which keeps the peak temperature low and increases the cooling rate as well. In the present work, research has been done to make known the effects of doing submerged friction stir processing on mechanical properties of AA5083/Al_2O_(3p) composite. The process was completed on each sample without changing the rotation and traverse speed of the tool. The pin of the tool was a threaded cylindrical one. Tensile and micro-hardness tests were used to evaluate the effect of the process on these properties of the samples. Also to study the microstructure of the samples, optical microscopy (OM) and scanning electron microscopy (SEM) micrographs were used. The results show that, underwater friction stir process is capable of producing defect-free M5083/Al_2O_(3p) nanocomposite. Analyzing the properties of the processed samples showed that, by significantly reducing the grain size, water environment has positive impact on the mechanical properties of the alloy; And that, Hall-Petch effect is more powerful than Orowan mechanism in enhancing the mechanical properties of the samples.
机译：摩擦搅拌处理，最近设计的晶粒细化以及微结构均质化技术已广泛用于铝合金。限制加工过程中晶粒长大的重要性，已使许多研究者努力将加工温度保持在较低水平，作为控制晶粒长大的方法之一。这样做的一种方法是在水下进行摩擦搅拌，这样可以使峰值温度保持较低，并且还可以提高冷却速度。在目前的工作中，已经进行了研究以了解进行浸没式摩擦搅拌处理对AA5083 / Al_2O_（3p）复合材料的力学性能的影响。在不改变工具旋转和移动速度的情况下，完成了每个样品的处理。该工具的销是带螺纹的圆柱销。拉伸和显微硬度测试用于评估工艺对样品这些性能的影响。为了研究样品的显微结构，还使用了光学显微镜（OM）和扫描电子显微镜（SEM）显微照片。结果表明，水下摩擦搅拌工艺能够制备出无缺陷的M5083 / Al_2O_（3p）纳米复合材料。分析加工样品的性能表明，通过显着减小晶粒尺寸，水环境对合金的机械性能产生了积极影响。而且，霍尔-Petch效应在增强样品的机械性能方面比Orowan机制更强大。

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