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对7xxx系Al-7Zn-2.5Mg-1Cu合金在流动氮气气氛下的烧结行为进行实验和计算流体力学模拟研究。3个尺寸为56 mm×10 mm×4.5 mm的长条样品在氮气流量为6 L/min的管式炉中同一批次进行烧结,样品间距为2或10 mm,烧结温度为620°C,烧结时间为40 min。实验结果表明,烧结样品不同截面上的孔隙分布与样品间距及该截面的位置有关。通过建立三维流体力学模型,研究等温烧结过程中3个样品周围的氮气行为。结果表明,每个烧结样品沿样品长度不同横截面的孔隙分布与烧结表面附近的氮气流场密切相关。
The sintering behavior of 7xxx Al-7Zn-2.5Mg-1Cu alloy under a flowing nitrogen atmosphere was experimentally studied and computational fluid dynamics simulations were performed. Three strips of 56 mm × 10 mm × 4.5 mm samples were sintered in the same batch in a tube furnace with a nitrogen flow rate of 6 L / min with a sample spacing of 2 or 10 mm and a sintering temperature of 620 ° C. Sintering time is 40 min. The experimental results show that the pore distribution on different sections of sintered samples is related to the sample spacing and the location of the section. Through the establishment of three-dimensional fluid mechanics model, the behavior of nitrogen around 3 samples during isothermal sintering was studied. The results show that the pore distribution of different cross sections of each sintered sample along the length of the sample is closely related to the nitrogen flow field near the sintered surface.