The Effects of Ageing Temperature and Time on Mechanical Properties of A356 Aluminium cast Alloy with Red Mud Addition and Treated By T6 Heat Treatment. (2015)

• Record Type: Journal Article
• Authors: Geetha, B.; Ganesan, K.
• Is Part Of: Materials today. Volume 2:Number 4/5(2015)
• Page Start: 1200
• Page End: 1209
• Publication Date: 2015
• Subjects: A356 -- red mud -- heat treatment -- mechanical propeties -- aging time, aging temperature; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2015.07.032
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: An investigation was carried out to study the effect of addition of different percentage (5%, 10%, 15% and 20%) of red mud with A356 cast alloy subject to T6 Heat treatment. A356 Alloys of appropriate composition were cast into sand moulds by stir casting techniques with the addition of different percentage of red mud. The metal matrix composites were subjected to homogenization for 24 hours at 500 o and solution treatment for 12 hours at 540 o C after natural ageing at room temperature for 24 hours, artificial ageing was carried out at different temperature (100 o, 200 o, 300 o and 400 o C) and different timing (2, 4, 6, and 8 hours). Tensile, Hardness and wear properties were determined by standard tests. During artificial ageing, the ultimate tensile strength and hardness were found to increase with ageing temperature; the maximum being attained at peak aged condition. After peak ageing temperature the ultimate tensile strength and hardness found to be decreased. The ageing time is having less significant effect on ultimate strength. The rate of ultimate strength is higher at initial ageing temperature then started reducing gradually the decrease in ultimate strength might represents over ageing time. The wear properties found to be increase with hardness and ageing temperature and with respect to ageing time the peak age timing which gives highest hardness was found to decrease with increase of the red mud content. The wear rate found to be decreases when the hardness increases. The addition of Red mud resulted in an increase in hardness and tensile strength. The effect of artificial aging on the microstructure is also studied by scanning electron microscopy.