Abstract
Steady-state directional solidification studies are described for Sr- and Sb-treated commercial purity Al-7 Si-0.5 Mg (LM25) casting alloys. The minor additions refine the secondary dendrite arm spacing which can be described by the equations: for Sr treated alloys and for Sb treated alloyswhere tf is the total solidification time.Specimens quenched during solidification are used to follow the coarsening of secondary dendrite arms during solidification. It is shown that coarsening behaviour can be described by an average coarsening parameter, , in the equation If the geometrical constant B is assumed to be 33, the value of calculated from spacing measurements is 20.80 and 15.22 (μm s−1) for Sr- and Sb-treated alloys, respectively. Both additions reduce the rate of coarsening. The influence of the additions on the growth temperatures of the primary Al phase and the eutectic phase is discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
