Microstructure and Microhardness of Ball Milled/Hot Pressed Aluminium with Mg3n2 Addition

Archives of Metallurgy and Materials

J. Morgiel¹  M. Gajewska¹  J. Dutkiewicz¹ 

[1] Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta str., 30-059 Krakow, Poland

关键词: Keywords : aluminium matrix composites;    high energy ball milling;    magnesium nitride;   

DOI  :  10.2478/amm-2013-0013

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The microstructure and microhardness of a ball milled and hot pressed aluminium powder with 10 vol.% of magnesium nitride (Mg3N2) were investigated. It was expected that the addition of a Mg3N2 as an nitrogen-bearing substrate would allow to obtain an in situ reaction leading to a formation of an aluminium nitride (AlN) strenghtening phase. The powders were milled in a high energy planetary ball mill for up to 40 h and then compacted in vacuum at 400ºC/600 MPa. The material was investigated by means of X-ray diffraction measurements (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and microhardness tests. The performed investigations showed that the composite preparation method provided a significant structure refinement of the material - the average matrix grain size of composite compact was about ˜140 nm. Energy Dispersive Spectrometry (EDS) analysis of Al/Mg3N2 compact combined with X-ray diffraction (XRD) technique indicated a presence of Mg3N2 as well as Mg-Al-O phase, which were probably formed during hot pressing. Microhardness tests showed nearly 40% increase in the hardness of Al/Mg3N2 composite over the non-reinforced aluminium compact.

【 授权许可】

Unknown