Oxidation Inclusion Defects in Large-size 2A14 Aluminium Alloy Ingots
The large-size 2A14 aluminium alloy ingots were analyzed by ultrasonic nondestructive flaw detection,industrial CT,metallurgical microscope(OM),scanning electron microscope(SEM),energy spectrum analysis(EDS),and tensile test to investigate the formation mechanism of defects.The results indicate that defects in 2A14 aluminium alloy ingot are dominated by oxide inclusions,which presents black irregularity and are mainly concentrated in the grain boundary and center of ingot.Oxide inclusion defects are commonly generated in the melting and casting stage,accompanied by hydrogen absorption phenomenon,which is one of the causes of crack sources.The investiga-tion on oxide inclusion defects in aluminium alloys and optimization of production process parameters contribute to defect reduction in aluminium alloys.
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