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首页> 外文期刊>Materials and Manufacturing Processes >Study of Boride-Reinforeed Aluminum Matrix Composites Produced via Centrifugal Casting
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Study of Boride-Reinforeed Aluminum Matrix Composites Produced via Centrifugal Casting

机译：离心铸造制备硼化物增强铝基复合材料的研究

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摘要

The redistribution of AlB_2 and AlB_(12) reinforcing particles in functionally graded Al-B-Mg composites was investigated as a function of centrifugal casting time, rotational speed, and pouring temperature of the melt. The microstructure was characterized both qualitatively and quantitatively on four different sections along the main axis (centrifugal force direction) of the cylindrical casting. The resulting aluminum matrix composite showed an evident gradient of particles concentration, with more particles at the external zone than at the internal zone of the casting. Processing temperature was found critical for its direct effect on the viscosity of the liquid, which regulates the segregation of the reinforcements. As expected, the higher concentration of particles on the external regions of the castings raised the measured superficial Rockwell hardness and Vickers microhardness of the composite. Finally, complementary energy dispersive spectroscopic analysis indicated that Mg dissolved in the AlB_2 dispersoids but not in the AlB_(12) particles.
机译：研究了功能梯度Al-B-Mg复合材料中AlB_2和AlB_（12）增强粒子在离心浇铸时间，转速和熔体浇铸温度下的重新分布。沿圆柱形铸件的主轴（离心力方向）在四个不同的截面上定性和定量地表征了显微组织。所得的铝基复合材料表现出明显的颗粒浓度梯度，在铸件的外部区域比内部区域的颗粒更多。发现加工温度对其直接影响液体粘度至关重要，该温度可调节增强材料的偏析。如预期的那样，在铸件外部区域上较高的颗粒浓度提高了复合材料的表观洛氏硬度和维氏显微硬度。最后，补充能量色散光谱分析表明，Mg溶解在AlB_2分散质中，而不溶解在AlB_（12）颗粒中。

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