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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Structural evaluation and mechanical properties of AZ31/SiC nano-composite produced by friction stir welding process at various welding speeds
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Structural evaluation and mechanical properties of AZ31/SiC nano-composite produced by friction stir welding process at various welding speeds

机译：通过摩擦搅拌焊接工艺生产的AZ31 / SiC纳米复合材料的结构评价和机械性能

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摘要

A metal matrix composite made of AZ31 containing SiC nano-particles was successfully produced by friction stir welding (FSW), and the effect of processing parameters such as rotational and transversal speeds on the microstructure (grain size) and mechanical properties (tensile and hardness tests) were investigated. Prior to friction stir welding, nano-sized SiC particles were incorporated into the joint line and then different rotational (600, 800 and 1000 r/min) and transversal speeds (25, 75, 125 and 175 mm/min) were tested. The results indicated that the grain size of the matrix and SiC nano-particles are two key parameters controlling different characteristics of the developed composite. Both parameters, in turns, are dependent on the heat generated during the FSW process. The increase of rotational speed and decrease of transversal speed result in high amount of heat and homogeneous distribution of SiC nano-particles. The former leads to grain growth and decrease of strength and hardness, while the latter causes grain refinement and increases of strength and hardness. Accordingly, the heat input has opposite effects on matrix grain growth and homogeneous distribution of particles. Therefore, optimum values of rotational and transversal speeds were found (800 r/min and 75 mm/min) to produce the best microstructure and mechanical properties.
机译：通过摩擦搅拌焊接（FSW）成功制造了由含AZ31的AZ31制成的金属基质复合物，以及加工参数，例如旋转和横向速度的效果，在微观结构（晶粒尺寸）和机械性能（拉伸和硬度测试）被调查了。在摩擦搅拌焊接之前，将纳米大小的SiC颗粒掺入接合线中，然后测试不同的旋转（600,800和1000 r / min）和横向速度（25,75,125和175mm / min）。结果表明，基质和SiC纳米粒子的晶粒尺寸是控制显影复合材料不同特性的两个关键参数。依次的参数依赖于FSW过程中产生的热量。转速的增加和横向速度的降低导致SiC纳米颗粒的热量和均匀分布。前者导致籽粒生长和强度和硬度降低，而后者会导致晶粒细化和增加的强度和硬度。因此，热输入对基质晶粒生长和颗粒均匀分布具有相反的影响。因此，发现旋转和横向速度的最佳值（800 r / min和75mm / min），以产生最佳的微观结构和机械性能。

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