Recycling of LM25 aluminum alloy scraps

Abstract

These days, a lot of metal scraps are generated by the automobile industry since the use of vehicles is increasing globally. As the production of automobile increases, the use of aluminum alloys has been increasing in automobile applications. Since the resources for the production of primary aluminum are getting scarce and the production of primary aluminum is highly expensive, production of components using secondary aluminum alloy in the form of scraps is highly essential. The present study deals with the re-melting of aluminium alloy scraps and the production of secondary aluminum alloy through a gravity die casting process. An investigation of its microstructure, chemical composition and mechanical properties such as hardness, tensile strength and an impact test have been performed and compared with the properties of primary and standard aluminum alloy. Porosity of secondary aluminum alloy is observed macroscopically. In addition a radiograph test was performed to study the internal defects of the secondary aluminum alloy.

Al-12Si Alaşımlarında Yüzey Oksit Uapısının Sr Varlığında Değişimi

“…Mehrabian [17] shown experimentally how trapped air bubble can result in breakaway oxidation and illustrated this mechanism impeccably. Ozer [18] and Bhagyanathan [19] studied the recycling efficiency of aluminum cans and showed that oxidation during remelting is the key parameter for improved melt cleanliness.…”

The effect of Ni addition on microstructure and mechanical properties of cast A356 alloy modified with Sr

“…Al-Si-Mg cast alloys are widely used in the automotive industry due to their good castability, high strength/weight ratio, and corrosion resistance [1][2][3]. The microstructure and mechanical properties of these alloys depend on many parameters such as chemical composition, melting, casting, and solidification conditions [4][5][6].…”

“…However, Ni-containing alloy does not contribute significantly to the mechanical properties because it shows brittle properties in new phases such as Al 9 FeNi formed in the system [2]. Since nickel is an expensive alloying element, it is essential to determine the amount of Ni added to the alloy for good performance [3,8]. One way to improve the mechanical properties of Al-Si-Mg alloys at room temperature is ageing (T6) heat treatment.…”