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.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||29|
|Publication status||Published - 1989|
|MoE publication type||D4 Published development or research report or study|
|Series||Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports|
- aluminum silicon alloys
- quality control