Heat Treatment for an Recycling Aluminum Aa6061 Using Milling Process at Various Holding Aging Time

Abstract

Abstract-In this investigation, AA6061 milled particle size was fabricated by milling machine and later compacted by hydraulic press in room temperature. Seven specimens were chosen for the heat treatment process. For reference, one specimen was treated solely by the quenching and another one was treated by the aging only, On top of that, there were five specimens were subjected to various holding times during the aging. The experimental results show that the maximum value of compression strength was 300.47 MPa for the specimen subjected to quenching and aging of holding time 4 hours and the maximum value for microhardness was 100.44 Hv for the same specimen. While the density value was decreased with increasing the holding time. The maximum value of the density was 2.61 g/cm 3 for the specimen (Quenching only). X-ray inspection was detected some of chemical compound were created such as (Al86Fe14) and (Cr13Ni5Si2). Keyword-Aging process, Milling process, Powder metallurgy, Recycling aluminium, AA6061.I. INTRODUCTION 6xxx Al-Mg-Si alloys have been widely used in automotive body panels as main substitute materials for weight reduction [1]. The industry has been focused on the materials as recycling, specifically the materials have been used more and more costly. These recycling offers several advantages which include their relatively lower production costs, isotropic properties and the possibility of using conventional shaping methods (e.g. Extrusion, forging, and rolling) for component manufacturing [2]. Among the various physical and chemical methods, a mechanical ball-mill technique is recognized as a simple and cost-effective method to produce fine and homogeneous powders [3]. During the past 20 years, high energy ball milling has extensively been utilized as a versatile method to produce a variety of advanced compound powders. The main difference between high energy milling by the planetary ball mill, Spex, Attritor mill, etc. and conventional milling is that the former applies much larger doses of energy to particles over time [4]. This large input energy makes high energy mills capable of producing materials with special properties that could not be synthesized by other methods. The milling process produces considerable strain hardening in the Al powder, which is directly reflected on the final properties of the composite powders, therefore, it is needed to treat with heat treatment process [5]. A commercial AA6061 aluminum alloy is one of the Al, Mg, Si(Cu) system alloys that can be significantly hardened by a proper heat treatment. Because of its medium strength, excellent corrosion resistance, and weldability, the AA6061 alloy has been widely used as structural material for construction, transportation and sports [6]. (Lipeng et.al.2015) has been treated aluminium AA6022 by various aging temperature (80, 100, 130 and 170 °C) and various holding times (2,3,4 hrs). He has concluded that the 100 °C by 3hrs is the best attempt. Other than that, there were researchers had been published some other research ...

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