Investigating the Mechanical Behaviour of Magnesium Alloy under Conventional Turning Process

Abstract

Magnesium alloys are mainly used in various architectural applications because of their lightweight, high strength, and excellent damping features. However, in-flammability is constraint in machining the alloy. Conventional turning operation under machining has been performed on AZ91 Mg alloy in current study, to find out response characteristics such as surface roughness (SR), metal removal rate (MRR) and chip morphology. L9 orthogonal array was considered to study the effect of turning process parameters such as depth of cut (D), feed rate (F), and cutting speed (V). The results observed that the turning parameters variation influences the MRR and surface integrity of AZ91 Mg alloy inclusive of chip morphology. Scanning electron microscopy was evaluated to correlate the effect of turning parameters on the machining performance. All process parameters have a synergistic influence on surface roughness. The cutting speed exerts a significant influence on the formation of chip types. As per the results, the most influencing characteristics with the use of the multi-objective optimization grey relational analysis are the cutting speed with reducing SR and maximizing MRR for the low down the degradation behavior of the Mg alloys. The GRA technique suggests that the optimal parametric setting for turning of AZ91 is V1(1500 rpm)- F3(250 mm/min)- D3(0.75 mm) for minimum SR and maximum MRR. This configuration is recommended to ensure the mechanical integrity and degrading behaviour for In-vitro studies.