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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Effect of nano-sized particles on grain structure and mechanical behavior of friction stir welded Al-nanocomposites
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Effect of nano-sized particles on grain structure and mechanical behavior of friction stir welded Al-nanocomposites

机译：纳米颗粒对搅拌摩擦焊接铝纳米复合材料晶粒结构和力学行为的影响

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摘要

Weldability of heat-treatable 6061-T6 aluminum alloy results in deterioration of mechanical properties due to dissolution of strengthening precipitates in the nugget zone of friction stir welded joints. These properties were improved by addition of reinforcement particles in the weld joint line. In the present work, attempts were made to produce 6061-T6 Al-based nanocomposites using the friction stir welding process by incorporating titanium oxide nanoparticles into the aluminum matrix for microstructure refining of the nugget zone and prevent the grain growth in the heat-affected zone. The effect of addition of nanoparticles on the evolution of grains structure and mechanical behavior of friction stir welded samples based on different combinations of rotational and travel speed was studied and discussed. Results revealed that the unreinforced samples were successfully welded at both low and high heat inputs, whereas the reinforced samples are not feasible at tool rotational speed (omega) < 2000 r/min and transverse speed (v) > 70 mm/min, respectively. The significant refining of grains in the nugget zone is possible with addition of nanoparticles via the Zener-pinning effect. A more pronounced increment in tensile strength, microhardness, and wear properties was observed compared to sample without nanoparticles under the same processing parameters due to embedment of nano-sized particles in the weld nugget zone.
机译：可热处理的6061-T6铝合金的可焊性由于搅拌摩擦焊接接头的熔核区域中强化沉淀的溶解而导致机械性能下降。通过在焊接缝中添加增强颗粒可以改善这些性能。在目前的工作中，尝试通过摩擦搅拌焊接工艺将氧化钛纳米粒子掺入铝基体中以细化熔核区的微结构并防止热影响区的晶粒长大，从而生产6061-T6 Al基纳米复合材料。 。研究和讨论了纳米粒子的添加对基于旋转速度和行进速度的不同组合的搅拌摩擦焊接样品的晶粒结构演变和力学行为的影响。结果显示，未增强的样品在低和高热量输入下均成功焊接，而增强的样品分别在工具转速（ω）<2000 r / min和横向速度（v）> 70 mm / min时不可行。通过齐纳钉扎效应添加纳米颗粒，可以在矿块区域内显着细化晶粒。与无纳米颗粒的样品相比，在相同的加工参数下，由于纳米大小的颗粒嵌入熔核区域，与之相比，抗拉强度，显微硬度和磨损性能的增加更为明显。

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