Dendrite Arm Spacing and Mechanical Properties of Aluminium Alloy Castings

Publisher Website
Google Scholar
Abstract
Experiments were carried out on castings made in conventional sand moulds to study the effect of solidification parameters on properties and structure of different aluminium alloys. From the study it has been concluded that temperature gradient and freezing index are important solidification parameters. These parameters have been related to mechanical properties and dendrite arm spacing, DAS. It is thus obvious that mechanical properties can be predicted just by measuring the DAS. Further, temperature gradient, G and freezing index, Fl can also be estimated from a knowledge of the measured DAS values. Nomograms have been constructed connecting the casting variables with the mechanical properties and structure. It is now possible to select the chill dimension in order to realise the desired DAS or mechanical properties in a casting.