论文部分内容阅读
研究铁对粉末冶金法制备铝基复合材料微观组织、力学性能及磁学性能的影响。利用机械混合制备含0,5%,10%和15%Fe(质量分数)的铝基复合材料。Al-Fe混合粉末经压制后在真空炉中600°C烧结1 h。XRD结果表明:在含有5%和10%Fe的试样中只有Fe和Al的衍射峰,而含有15%Fe的试样中则存在Al和Al13Fe4的衍射峰。实验结果表明:随着Fe含量的增加,材料的致密度和导热性变差。复合材料中的Fe可以提高其强度和硬度。材料的强化机制包括基体的晶粒细化,Fe颗粒的均匀分布以及Al13Fe4金属间化合物的形成。含有5%Fe试样的磁化强度为0.3816×10-3A·m2/g,对于含有10%Fe的试样,其磁化强度增加至0.6597×10-3A·m2/g,而对于含有15%Fe试样,其磁化强度降低至0.0702×10-3A·m2/g。这是由于在高铁试样中形成了反磁性的Al13Fe4金属间化合物导致磁化强度降低。
The effect of iron on the microstructure, mechanical properties and magnetic properties of aluminum matrix composites prepared by powder metallurgy was studied. Aluminum-based composites containing 0, 5%, 10% and 15% Fe (mass fraction) were prepared by mechanical mixing. The Al-Fe mixed powder was pressed and sintered in a vacuum furnace at 600 ° C for 1 h. XRD results show that there are only diffraction peaks of Fe and Al in the samples containing 5% and 10% Fe, and diffraction peaks of Al and Al13Fe4 in the sample containing 15% Fe. The experimental results show that with the increase of Fe content, the density and thermal conductivity of the material deteriorate. Fe in composites can increase its strength and hardness. The strengthening mechanism of the material includes grain refinement of the matrix, uniform distribution of Fe particles and formation of Al13Fe4 intermetallic compound. The magnetization of the sample containing 5% Fe was 0.3816 × 10 -3 A · m 2 / g, and the magnetization of the sample containing 10% Fe was increased to 0.6597 × 10 -3 A · m 2 / g, whereas for the sample containing 15% Fe The magnetization of the sample decreased to 0.0702 × 10-3A · m2 / g. This is due to the formation of a diamagnetic Al13Fe4 intermetallic compound in a high-speed rail sample resulting in a decrease in magnetization.