Main Article Content
An Aluminum alloy casting mainly used in industrial engineering as the technique can fabricate the products with complex shape in lower superheat in a simple processing run. As the use of Aluminum alloy is more it is required to improve its mechanical properties and grain structure. In this review study the influence of mechanical vibration on the mechanical properties and micro-structure of Aluminum Alloy during gravity die casting has been discussed. Gravity die castings of AC4C Aluminum alloy (AlSi7Mg) under mechanical vibration (0-120 Hz) were conducted using the actual casting machine.
A part of mold (vibrating mold) was oscillated by a vibrator. Mechanical vibration imposed before pouring, and stopped at 40s after pouring. Columnar rod specimens (25 mm in diameter and 210 mm in length) were cast to investigate the effects of mechanical vibration on grain size, inner defect, and mechanical property. The grain size of columnar rod specimen decreased from 1800 µm (0 Hz) to 750 µm (100 Hz) by imposition of mechanical vibration. The internal defect of specimen decreased by mechanical vibration of frequency 70 Hz or less. But the vibration of 80 Hz or more led to increase of internal defect. As a result, specimens cast with the vibration of frequency 70 Hz showed higher UTS (ultimate tensile strength) compared with the specimen cast under other vibration conditions.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.