A computer-aided quality control method for the modification of AlSi12 melts

Veijo Rauta

Research output: Book/ReportReport


The work concentrates on studying the sodium modification of AlSi alloys having silicon contents 9.85 - 13.5 %. Several test pieces including derivative thermal analysis (DERTA) samples, test bars for tensile tests and cylinders with different diameters were cast with different degrees of modification. Relationships between the degree of modification, chemical composition and thermal analysis parameters were studied by correlation analysis with a microcomputer. The results show that mechanical properties (the yield strength, the tensile strength and the elongation) increase in general with increasing degree of modification. A correlation between the degree of modification and the temperature of eutectic recalescence was found. On the basis of the results, a computer-aided quality control method was developed based on derivative thermal analysis. The method can be used to predict the degree of modification of AlSi 12-melts prior to casting. The quality control method has been successfully tested in the laboratory as well as in an industrial foundry.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages29
ISBN (Print)951-38-3411-5
Publication statusPublished - 1989
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports


  • aluminum silicon alloys
  • casting
  • modification
  • quality control


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