PT Journal
AU Michna, S
   Honzatko, R
   Cais, J
TI Analysis of Causes of Al2MgO4-Type Spinel Inclusions Formation in Al-Mg Alloys during Low-Pressure Casting
SO Manufacturing Technology Journal
PY 2013
BP 361
EP 368
VL 13
IS 3
DI 10.21062/ujep/x.2013/a/1213-2489/MT/13/3/361
DE spinel inclusions; low-pressure casting; AlMg3 alloy; EDS analysis; macroscopic and microscopic analysis
AB The aim of the research was to identify and analyze the nature and causes of black inclusions formation on a cast surface of AlMg3 alloy. Forms used in tires production are made of AlMg3 alloy by low-pressure casting technology. Four areas with the same shape and coloring of inclusions are marked on the figure Fig. 1. These areas underwent macroscopic and microscopic analysis. In regions of inclusions appearance several surface EDS analyzes were performed with the aim to determine chemical composition of the inclusions. EDS analyzes showed that the inclusions are in fact Al2MgO4-type spinel inclusions which appear for Al-Mg alloys with higher amount of Mg (above 1 - 2 %). As far as the theory of the problem is concerned, possible causes of spinel inclusions formation are described in the literature [1, 2, 3, 4]. Other possible causes of spinel inclusions formation considering low-pressure casting of AlMg3 alloy found during long-term research of low-pressure casting of Al-Mg type alloys are mentioned in [5].
ER