Papers by Keyword: AA5083

Abstract: The revolutionary method of solid-state joining technique has already attracted significant attention of advance welding and joining research community. The technique has been continuously developing for many alloy systems for similar and dissimilar joints. Recent research in these areas aiming to join complex dissimilar alloy pairs, composite, polymers, ceramics etc. This paper presents a study of friction stir welding between marine-grade aluminum alloy AA 5083 and HSLA steel, configured in a butt arrangement. The study investigates the evolution of Fe-Al series of intermetallic layer formation at the joint interface and its effective management to yield best joint efficiency. The FSW in the said alloy pairs yielded an 83.25% welding efficiency based on the aluminum alloy side strength. XRD analysis along with SEM examination revealed the formation of Al₁₃Fe₄ and Al₅Fe₂ as intermetallic compounds which was confirmed by the EBSD analysis. The obtained results are discussed in the paper considering the effect of the weld joint performance.

Abstract: The influence of Sc on the mechanical properties and microstructure evolution an AA5083 was studied. AA5083/0.33wt%Sc was prepared by stir casting, and then this alloy was subjected to a cryorolling process at-196°C with 50 % rolling reduction. The mechanical properties of the specimens were measured by tensile strength testing and Vickers microhardness test. Furthermore, the microstructure of specimens was analyzed by X-Ray diffraction analysis, scanning electron microscopy (SEM), optical microscopy and electron back scattered diffraction. The ultimate tensile strength (UTS) of the base AA5083 alloy was 238 MPa, which increased to 244 MPa after adding 0.33wt%Sc. After subjecting the as-cast AA5083/0.33wt%Sc to 50% cryorolling reduction, the UTS increased to 404 MPa. The fractured surfaces revealed a large-scale dimpled structure, similar to the ductile fracture mechanism in the starting material. In the cryorolled sample, a fibrous morphology with tiny dimples was observed, corresponding to the low elongation.

Abstract: In the present work, a FEI Sirion FEG-SEM equipped with a Nordlys CCD camera controlled by HKL Channel 5 software has been used to characterize the crystallographic texture of 20mm thick friction stir welded AA6082-T651 and AA5083-O. The crystallogaphic texture has been nvestigated near the top surface of the weld nugget at the shoulder affected region and near the base of the nugget in the probe affected region. The crystallographic texture in the shoulder affected region is complex in terms of determing the local reference frame of deformation and it requires complicated rotations to resemble the ideal simple shear texture. This implies the complex deformation histroy experinced in this region. However, the crystallographic texture in the probe-dominated region is simple shear texture. This implies that the deformation conditions across the whole weld nugget in this region are mianly dominated by the shear deformation generated by the probe rotation with the forward motion of the tool only playing a minor role in determining the local deformation gradient. Alternating bands between (+)and (C) was observed in the NG region of FSWed AA6082. The existence of A component is observed with an existence of strong C texture component which implies that when the C component is strong it can be associated with the A texture components.The crystallographic texture of AA5083 at both the shoulder and the probe dominated region is weak relative to that of the AA6082 .

Abstract: The interest in Multiwall Carbon Nanotube (MWCNT) as reinforcement for Aluminium alloy has been growing considerably because of its significant properties such as high Strength, elastic modulus, flexibility and high aspect ratios which makes the combination for being used in aerospace, automobile and marine applications. This work mainly focuses on the theoretical analysis of Strength and Young’s modulus of MWCNT addition with Aluminium 5083 metal matrix composite for different compositions like 1, 1.25, 1.5 and 1.75 weight %, representing that the MWCNT are effective reinforcement. The predicted value shows that, the addition of MWCNT is increasing the Young’s modulus and Strength for the composite compared to the AA5083 (Aluminium alloy).

Abstract: In recent years there has been a largely unspoken demand for a high strength, non-heat treatable aluminium alloy for superplastic forming applications. This is particularly true for the automotive industry since the high strength, superplastic aluminium alloys, such as AA7475, are both too time consuming (in forming and heat treatment) and too expensive. Compound this with the expense of corrosion protection and almost all aluminium alloys except for AA5083 fall by the wayside for the automobile industry.However, the need for a higher strength alloy has remained. To achieve this Hydro has systematically investigated the basis behind the superplastic forming of AA5083. On this basis a new high strength 5xxx alloy was extrapolated. The resulting alloy was then characterised and benchmarked against the existing SPF alloy, AA5083. The new alloy, an AA5456-type alloy demonstrated a higher strength than AA5083 while improving the formability and rate of forming. This paper will discuss some of the lessons learned during the development of this alloy.

Abstract: The AA5083 alloy is already being used in applications that require lightweight construction and moderate strengths. In order to carry out accurate simulations of the superplastic forming of this alloy, the used constitutive models should be able to predict the deformation and thinning behavior during the forming process. In this paper, we compare the dome height and pole thickness evolution during gas bulge forming using different AA5083 constitutive material models. The models considered have different levels of complexity and are fitted using either tensile or biaxial experimental data. The simulation results are also compared with experimental data from literature. In addition, recommendations are made for developing accurate material models for the considered AA5083 alloy.

Abstract: This paper presents an investigation of research objectives on the effect of tilt angle on microstructure and mechanical properties of dissimilar aluminum alloy sheets between AA5083 and AA6061, 5mm plates by using Friction Stir Welding (FSW) process in butt joint. The base materials of AA5083 and AA6061 were located on the retreating side (RS) and advancing side (AS), respectively. The welding process and the welding parameters such as tool pin profile, tool rotation speed, welding speed and tilt angle influenced the mechanical properties of the Friction Stir Welding joints significantly. For this experiment, the Friction Stir Welding materials joined under five different tilt angles (from 0^oto 4^o) with 86mm/min of welding speed and 910 rpm of tool rotation speed which were set similarly. Microscopic examination on the weld samples showed significant variation in the microstructure especially in the region of heat-affected zone (HAZ), weld nugget or dynamically recrystallized zone (DXZ) and in the base metal.