The effect of holding and stirring time on porosity of aluminium copper alloy in rheocasting process Maruf maruf1,2, Rudy Soenoko3, Wahyono Suprapto3, Ahmad As^ad Sonief3
1Mechanical Engineering Department, Lambung Mangkurat University, Banjarmasin, Indonesia
2Doctoral Program of Mechanical Engineering Department, Brawijaya University, Malang, Indonesia
3Mechanical Engineering Department, Brawijaya University, Malang, Indonesia
Abstract
Aluminum and its alloys are among the most used materials in design and engineering applications after steel. The most widely used copper aluminum alloys are those containing 4 to 10% Cu. Aluminum-copper alloy can reduce the castability or flowability of the alloy. This deficiency can lead to porosity defects, thereby reducing product quality, and the rheocasting process is expected to improve castability. This research aims to investigate effect of holding and stirring time on porosity of aluminium copper alloy in rheocasting process. Casting process using rheocasting with variation of holding and stirring time. the specimens were tested for elemental composition using spectrometry. The percentage value of specimen porosity is done by comparing apparent density using the picnometry method and true density using ASTM E252-84. Based on the research that has been done regarding the effect of holding time, stirring time on porosity, it can be concluded as follows: The longer the stirring time and the holding time, the lower the porosity value. The current article is to highlight the implication of rheology are effect of several process and metallurgical parameters, fraction solid of the primary phase and its morphology, size and distribution micro structure
