Faculty Scholarly Dissemination Grants

Title

Investigation of the Effects of Solidification Rate and Hydrogen Concentration on Porosity Formation in Aluminum Alloy 2024

Department

School of Engineering

College

Padnos College of Engineering and Computing

Date Range

2010-2011

Abstract

The effects of solidification rate, initial melt hydrogen concentration, and grain refining on porosity formation in aluminum alloy 2024 have been investigated with unidirectionally cooled laboratory-size ingots. The ingots were prepared from melts containing hydrogen concentration of 0.059-0.27 cm3/100 g and solidified at 0.2-37 oC/s. As expected, the amount of porosity, average pore size, and pore number density increased with increase in melt hydrogen concentration and decrease in solidification rate. However, the effect of solidification rate was greater at the very low melt hydrogen concentration (0.059 cm3/100 g). These results are consistent with reported effects of solidification rate and melt hydrogen content on porosity formation in other aluminum alloys. Interestingly, addition of grain refiner slightly increased the amount of porosity and the average pore size, especially at solidification rates above 1oC/s.

Conference Name

TMS 2011-140th Annual Conference of The Minerals, Metals, and Materials Society

Conference Location

San Diego, California



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