Archaeological Arsenical Bronzes and Equilibrium in the As-Cu System

Metallurgical and Materials Transactions B - Understanding the effects of impurities, segregation, undercooling, and solidification velocity is necessary to reconstruct prehistoric As-Cu alloy...     

Investigation of the correlation between growth restriction and grain size in Cu alloys

The growth restriction factor Q of the alloying elements of the Cu-system was determined using thermodynamic software tools to obtain accurate Q-values. A comprehensive list was given for a nominal solute content of 1 wt-%. Based on the calculations, melting experiments were carried out under defined casting conditions given by the TP-1 test to evaluate the correlation between Q and grain size in Cu alloys.     

Evaluation of the effect of artificial re-gassing of aluminium melts after ultrasonic treatment

Ultrasonic treatment of aluminium melts is known as an efficient process to remove dissolved hydrogen. Whereas the degassing efficiency of ultrasonic treatment has been extensively reported, the effect of re-gassing after the ultrasonic treatment is much less studied. The present investigation attempts to evaluate the effect of artificial re-gassing of aluminium melts after ultrasonic treatment was applied. The results show an increase in porosity after artificial re-gassing after ultrasonic treatment compared to artificial gassing before the ultrasonic treatment was applied. An increase in potent nucleation sites for gas porosity after ultrasonic treatment by unfolding and/or break-up of bifilms is supposed.