Late News Poster Session: Light Metals
Program Organizers: TMS Administration

Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC


E-34: A Comparative Study on the Homogenization Process of the Aluminum Billets in the Batch and Continuous Homogenizing Furnace Using with CFD Simulations and Microstructure Analysis: Murat Dogan1; Deniz Guler1; Deniz Urk1; Gokcen Gokce1; Akin Obali1; 1Sistem Teknik Industrial Furnaces LTD
    Vertical direct chill casting is a conventional method for producing wrought aluminum alloy billets. The homogenization process must be carried out in cast billets because of β-AlFeSi intermetallic particles, often held responsible for surface defects and poor extrudability, are replaced by the more spherical discrete α AlFeSi particles during soaking. Homogenization is a three-step heat treatment that occurs after casting: heat-up, soak, and cooldown. In comparison to batch type furnaces, continuous homogenization can provide homogenization temperature uniformity, reduce soak time, and increase cooling rate. The cooling rate has a significant impact on the size of Mg2Si particles precipitated in aluminum billets. In this case, Mg2Si particle size of a continuous homogenization furnace is finer than batch type. In this study, the CFD analysis was conducted for different homogenizing furnace. However, microstructures analysis for each furnace’s products were investigated optical microscopy and SEM for understanding β→α transition and Mg2Si particles size.

E-32: Combining In-situ Diffraction, In-situ Acoustic Emission and High-resolution Digital Image Correlation to Study Tension-compression Asymmetry in the WZ21 Alloy: Gerardo Garces1; Pablo Pérez1; Edurne Laurin1; Judit Medina1; Andreas Stark2; Norbert Schell2; Alberto Orozco3; Kristian Mathis4; Paloma Adeva1; 1Cenim-CSIC; 2Helmholtz-Zentrum Hereon; 3Universidad Politécnica de Madrid; 4Charles University
    The combination of in-situ synchrotron radiation diffraction, in-situ Acoustic Emission and high-resolution digital image correlation has been used to study the deformation behavior under tension and compression of an extruded Mg-2%Y-1%Zn(wt.%) alloy. The microstructure of extruded Mg-Y-Zn alloy is composed of areas with DRXed grains and areas consisting of very coarse non-DRXed grains which are highly oriented with their basal plane parallel to the extrusion direction. The volume fraction of DRXed and non-DRXed areas are 80% and 20%, respectively. This microstructure induces the typical tension-compression asymmetry of extruded magnesium alloys. Results conclude that DRxed grains deform by the activation of the basal slip system independently of the stress mode, tension or compression. Non-DRXed grains behaves as reinforcement under tensile tests bearing an additional load transferred by soft grains. At high stresses non-basal slip systems are also activated. Under compression, however, non-DRXed grains deformed easily by the activation of tensile twinning.

Current State of Technology of Next-Generation Ceramic Foam Filter: Jochen Schnelle1; Elisabeth Wischhoff1; Ragnhild Aune2; 1Drache; 2NTNU
     In Aluminium casthouse using ceramic foam filters (CFF) is the well-established technology for reducing inclusion levels in billets and rolling ingots. Reduction of dissolved hydrogen in Aluminum melts in reduce porosity is typically done by a gas purging process using Argon or Nitrogen, possibly mixed with Chlorine. With a novelty CFF material it is possible to remove inclusions plus to reduce dissolved hydrogen in the melt.The poster presentation describes the current state of technology of the filter. To further characterize and compare the new filter generation to the current technology, trials testing permeability and strength while casting have been performed. Various casting trials using different alloys had been carried out to rate the performance and measure the reduction of hydrogen in the melt.

E-39: Effect of Fine Precipitates on the Mechanical Properties of Lightweight Mg-Li Alloy with Rare Earth Addition: Yong-Ho Kim1; Byeong-Kwon Lee1; Eun-chan Ko1; Hyeon-Taek Son1; 1Korea Institute of Industrial Technology
    Magnesium alloys are attractive as structural materials for transportation systems, electrical components, and provide excellent damping with low density (1.74 g/cm3) and high strength-to-weight ratio. However, the hexagonal close-packed (HCP) structure limits the use of Mg due to insufficient plasticity. Therefore, it is an important problem in the development of a new Mg alloy with high formability and improved production capacity. Among Mg alloys, when Li is added to the Mg alloy system, the crystal structure changes to body-centered cubic(BCC) along with HCP, resulting in more slip systems. In this study, Mg-10wt.%Li-1wt.%Al-1wt.%Zn alloys adding with RE(rare earth) were extruded at 200 °C. The effect of RE addition on the microstructure and mechanical properties of the extruded alloy was investigated. In order to improve mechanical properties, a sample was additionally prepared through a rolling process. Differences in tensile properties depending on the RE content were investigated by metallographic observation.

E-36: Effect of Mg Addition on the Mechanical Properties and Microstructure of Al-Li-Ce Alloys: Byeongkwon Lee1; Eun-Chan Ko1; Yong-Ho Kim1; Hyeon-Taek Son1; Sung-Kil Hong2; 1Korea Institute of Industrial Technology; 2Chonnam National University
     The Al-Li alloy is light and has high specific strength and specific modulus, and is widely used in the aerospace field. Since Al-Li alloy can be applied not only to the aerospace field but also to the automobile industry and defense industry that require alloys with high specific strength, many studies are being conducted to improve the properties. In this study, Al-2Li-1Ce-xMg (x=0, 2, 4 and 6wt.%) alloy was gravity casted, the cast billet was hot-extruded with a rod at an extrusion ratio of 37:1, and the extruded alloy was 1.7mm thick. After processing, a rolled material of 0.65 mm was manufactured through multi-stage rolling. XRD, FE-SEM, XRD, and EBSD were observed to analyze each alloy, and a tensile test was performed to analyze mechanical properties.lithium

E-38: Effects of Mg Contents on Microstructure and Mechanical Properties of the Rolled Al-xMg-0.12Mn-0.12Cr Based Alloy with Thin Plate: Hyeon-Taek Son1; Yong-Ho Kim1; Byong-Kwon Lee1; En-Chan Ko1; 1Korea Institute of Industrial Technology
    Lightweight Aluminum alloys, particularly 5xxx series Al-Mg alloys, are now widely used in aerospace, maritime, and automotive industries due to the superior strength-to-weight ratio, excellent corrosion resistance and recyclability. Mg has a high solubility in the Al matrix and solute Mg can appreciably improve the work-hardening ability of Al-Mg alloys. In this study, effects of Mg addition in the rolled Al-xMg-0.12-0.12Cr based alloys with thin sheet (0.2mm) on microstructure and mechanical properties. In first, Al-xMg-0.12-0.12Cr (x = 2, 4, 6, 8, 10 and 12wt.%) alloys were prepared by gravity cast process. This Al alloys were hot-extruded into a sheet that was 4mm in thickness and 50mm in width at 500℃. The extruded alloys were rolled with a thickness of 0.2 mm at room temperature. The microstructure of specimens was examined by OM, XRD, SEM and EBSD. The mechanical properties of the Al alloys were maintained by a tensile test.

Evaluation of Yield in the Production of Machined vs High Pressure Die Cast A360: Deniz Cil1; Ceren Ciytak1; Kerem Dizdar2; Hayati Sahin3; Derya Dispinar3; 1GP HPDC; 2Istanbul Technical University; 3Foseco
    A product was originally produced by machining in CNC operations from a block of A360 aluminum alloy. In this work, a case study was developed with the aim to produce the part by high-pressure die casting. The production yield of comparison between machined and high-pressure die-cast parts was evaluated. It was found that an 80% yield was achieved by changing the production method from machining to high-pressure die casting. PQ2 simulation tool was used to optimize the casting parameters.

Machine Learning for Joint Quality Performance-A Comparison Study of the Relationship between Process Parameters and Weld Microstructure of Al/Steel Resistance Spot Welds: Alejandro Ojeda1; Moses Obiri1; 1Pacific Northwest National Laboratories
    The qualities of resistance spot welding (RSW) of aluminum to steel are being explored in order to reduce vehicle weight and hence boost fuel efficiency. Resistance spot welding of Al and steel results in a layer of brittle intermetallic compounds along the Al and steel sheets' contact. Previous research has described the parameters of microstructure variables (fracture mode, hardness, and thickness) in the intermetallic layer formed by RSW of Al - steel welds. In contrast, the role of weld process parameters in the weld intermetallic layer has yet to be well studied. For two Al types, we employ supervised machine learning algorithms to determine essential welding parameters that result in excellent weld microstructure and intermetallic layer characteristics. The results are compared between the two different types of aluminum, and they are utilized to plan intelligent experiment design in a subset of the parameter space, which ultimately leads to production optimization.