Microstructure evolution and densification behaviour of powder metallurgy Al-Cu-Mg-Si alloy
Microstructure evolution and densification behaviour of powder metallurgy Al-Cu-Mg-Si alloy
复制标题
粉末冶金Al-Cu-Mg-Si合金的显微组织演变及致密化行为
DOI：
10.1080/00325899.2020.1719688
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发表时间：
2020-01-01
影响因子：
1.4
通讯作者：
Qu, Xuanhui
中科院分区：
文献类型：
--
作者：
Qiu, Tingting;Wu, Mao;Qu, Xuanhui
采用传统的压制烧结粉末冶金方法，使用元素 Al 粉末制备 Al-Cu-Mg-Si 合金。详细研究了Al-Mg、Al-Si合金和Cu在烧结过程中的相变过程。研究发现合金中发生一系列相变，破坏了Al颗粒的氧化膜，增强了致密化过程。烧结样品的相对密度达到98%。除MgAl2O4相外，在晶界处发现了新的Al-Mg-Cu-O化合物，推测氧化膜的破坏也与除Mg以外的其他合金成分有关。此外，尽管在流动的氮气气氛下烧结，但在晶界区域没有发现可检测到的AlN化合物，这得益于生坯的高密度以及液相与铝之间优异的润湿性。
An Al-Cu-Mg-Si alloy was prepared by conventional press-sintering powder metallurgy using elemental Al powder. The phase transformation process of Al-Mg, Al-Si alloy and Cu during the sintering process was investigated in details. It was found that a series of phase transitions take place in the alloy to disrupt the oxide film of Al particle and enhance the densification process. The relative density of the sintered samples reached 98%. A new Al-Mg-Cu-O compound was found at the grain boundaries except the MgAl2O4 phase, it is speculated that the disruption of the oxide film was also associated with the other alloy compositions except for Mg. Furthermore, no detectable AlN compound was found at the grain boundary region although sintering with flowing nitrogen atmosphere, which is benefit from the high density of the green compact and the excellent wettability between the liquid phase and the aluminium.