Abstract
The effect of different scheduled artificial ageing hardness on the tensile and impact properties of Al-6Si-0.5Mg-2Ni alloy was studied. The solution treated Al-6Si-0.5Mg-2Ni alloy was aged isochronally for 1 hour at temperatures up to 300oC. The precipitation stages during ageing were monitored by hardness measurements. Tensile and impact properties were determined by standard tests. During artificial ageing, the yield and ultimate tensile strength were found to increase with ageing hardness; the maximum being attained at peak hardness. Ductility and impact toughness of the alloy, on the other hand decreased with ageing hardness, reaching the minimum at the highest hardness. The strength of Al- 6Si-0.5Mg-2Ni alloy was best at highest hardness but exhibits poor ductility and impact strength. KEYWORDS: Al-6Si-0.5Mg-2Ni alloy; ageing; hardness; tensile properties; impact strength;
Highlights
Age hardened Al alloys are widely used in engineering applications due to the considerable improvements in their yield strength and hardness by controlled thermo mechanical treatments [1]
The aim of this paper is to evaluate the effects of ageing hardness on the tensile properties and Charpy impact strength of Al-6Si-0.5Mg-2Ni alloy with applications in automotive engineering
The hardness values of the aged Al-6Si-0.5Mg-2Ni alloy increased with ageing temperatures up to 225oC (92.6 HRF).Its hardness was observed to decrease sharply for temperatures in the range of 225-400oC
Summary
Age hardened Al alloys are widely used in engineering applications due to the considerable improvements in their yield strength and hardness by controlled thermo mechanical treatments [1]. Al-Si based multi-component foundry alloys provide several advantageous characteristics such as good castability, high corrosion and wear resistance, as well as high thermal conductivity and adequate strength at elevated temperatures [2]. Al-Mg-Si alloys have been widely used in transportation systems owing to their fair strength, weldability and corrosion resistance. The accelerated need for weight reduction, leads to higher mechanical and thermal loading of these aluminum castings in future vehicles, requiring improved Al-Si foundry alloys concerning strength at elevated temperatures [1,2,3, 5]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
