温度梯度区域熔化对Al-Cu-Mg合金第二相析出及其性能的影响

发布时间：2018-05-17 19:16

  本文选题：温度梯度区域熔化 + 均匀化　； 参考：《稀有金属材料与工程》2015年11期

【摘要】：采用SEM、EPMA、TEM以及显微硬度测试等手段,研究了温度梯度区域熔化(TGZM)对Al-Cu-Mg合金溶质原子浓度分布、第二相析出以及显微硬度的影响。研究表明:TGZM导致晶界两侧基体中的溶质原子浓度存在显著差异,靠近铸锭边部一侧基体的Cu、Mg溶质原子浓度明显高于靠近铸锭心部一侧基体的溶质原子浓度。在485℃的均匀化处理过程中,晶界两侧晶粒靠近边部一侧有大量第二相析出,而靠近心部一侧则很少或者几乎没有第二相析出。该现象致使同一晶界两侧区域的显微硬度值存在明显差别,并且这种差别无法通过长时间的均匀化处理得以完全消除,在微观上加剧了合金不同区域性能的差异。
[Abstract]:By means of SEM EPMA TEM and microhardness measurement, the effects of melting temperature gradient (TGZM) on solute concentration distribution, second phase precipitation and microhardness of Al-Cu-Mg alloy were studied. The results show that the concentration of solute atoms in the matrix on both sides of the grain boundary is significantly different due to the concentration of solute atoms in the two sides of the grain boundary. The concentration of solute atoms near the side of the ingot edge is obviously higher than that of the solute atom near the side of the ingot core. During the homogenization treatment at 485 鈩，

本文编号：1902532