Effect of Structural Changes on Microstructure, Mechanical Properties and Fractographical Analysis of Binary Al-12si Base Alloy
- May 20, 2018
- Posted by: RSIS
- Category: Mechanical Engineering
International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IV, April 2018 | ISSN 2321–2705
Devappa1, T. M. Chandrashekharaiah2, D.N. Roopa3, Somashekar Hiremath4
1 Assistant Professor, Department of Mechanical Engineering, JSS Academy of Technical Education, Bengaluru, Karnataka, India.
2Professor and Head, R&D Centre, Department of Mechanical Engineering, Kalpataru Institute of Technology, Tiptur-572201, Karnataka, India.
3Assistant Professor Department of Mechanical Engineering, JSS Academy of Technical Education Bengaluru, Karnataka, India
4Assistant Professor Department of Mechanical Engineering, Shaikh College of Engineering and Technology, Belagavi-591116, Karnataka, India.
Abstract: – Present investigation deals with the influence of grain refinement (Al-1Ti-3B) and modification (Al-10Sr) on the microstructure, mechanical properties such as fracture toughness and fracture behaviour of Al-12Si alloy. The tests like tensile, hardness, impact and fracture toughness are conducted on as cast as well as refined and modified binary Al-12Si alloy. The characterisation of Al-12Si alloy before and after tests are conducted using opticalmicroscope and scanning electron microscope (SEM) techniques. The results showed that improvements in the mechanical properties and fracture toughness with the additions of refiner and modifier when compared to as cast condition. Further, the fractographical analysis shows that brittle fracture with severe damage is observed in case of binary as cast Al-12Si alloy. Whereas grain refined and modified alloys showed less severity in damage due to increase in toughness and strength of the alloys.
Keywords: Al-12Si alloy, Al-1Ti-3B, Al-10Sr, Fracture toughness, Fractographyetc.
I. INTRODUCTION
The uses of aluminium and its alloys are expanding every day in manufacturing sector to make the machine parts. Among the aluminium group of casting alloys especially Al-Si alloys are the lightest engineering material and most widely recognized because of some extremely appealing properties such as specific strength, outstanding castability, lower co-efficient of thermal expansion, excellent thermal conductivity, high resistance to corrosion and also superior mechanical properties [1-10].
