Aluminum Alloys, Processing and Characterization: Microstructure Evolution & Characterization
Sponsored by: TMS Light Metals Division, TMS: Aluminum Committee
Program Organizers: Andre Phillion, McMaster University; Dmitry Eskin, Brunel University

Tuesday 2:30 PM
March 1, 2022
Room: 208B
Location: Anaheim Convention Center

Session Chair: Andre Phillion, McMaster University

2:30 PM  
Computational and Microstructural Analysis to Understand the Correlation between Precipitate Distribution and Mechanical Properties in Al-Cu-Mg-Mn Wire Material: Peer Decker1; Axel Marquardt1; Dominique Cance2; Magali Guizard2; Luisa Marzoli1; Marcel Rosefort1; 1Trimet Aluminium Se; 2Trimet France
     Aluminum alloy development including the proper thermal treatment of materials is a complex matter since many factors e.g. like composition or phase formation amongst others influence the resulting properties. In the given case, an representative Al-Cu-Mg-Mn alloy was calculated and analyzed. The aim was to relate computational and experimental methods to better understand the processes in the material to come up with better modelling parameters that allow for a more precise prediction of materials properties. Initial equilibrium calculations in Thermocalc were compared to x-ray diffraction (XRD) and scanning electron microscopy (SEM) results on physical samples. This data was used as starting point for precipitation simulation with the Thermocalc Prisma module to calculate the mechanical properties.The experimental mechanical properties determined via tensile testing were compared to the computational findings. The correlation between experiment and simulation was then evaluated.

2:55 PM  
NOW ON-DEMAND ONLY - Influence of Heat Treatment on the Electrical Resistivity of Aluminum Alloyed with Zirconium and Scandium: Alexander Alabin1; Dmitry Fokin1; Sergey Valchuk1; 1UC RUSAL
    In the presented work, the effect of heat treatment on the values of the electrical resistivity and the potential level of hardening due to the formation of secondary precipitates of phases of the L12 type of alloys Al-Zr-Sc system for foundry ingots and cold rolled sheets was investigated. By use of the calculated and experimental method carried out quantitative analysis of zirconium and scandium redistribution between the aluminum solid solution and a secondary discharge type L12 after different heat treatment regimes. The positive role of scandium in a more rapid decrease in the values of resistivity in the Al-Zr-Sc system after heat treatment is shown.

3:20 PM  
Micro and Mechanical Characteristic of Hotband Annealed of a Continuous Cast Al-1.5Cu Alloy with Potential Application in High Strength and Low-cost Auto Forming Parts & Sheets: Xiyu Wen1; 1University of Kentucky
    Characteristic and mechanical properties, microstructures including transformation of phases, textures, and formability of hotband annealed of a continuous casting (CC) Al-1.5Cu alloy by using tensile machine, optical & scanning electronic microscopes and X-ray diffraction method were evaluated and studied overall. In addition, the different phases formed during heating were determined by DSC technology. Compared with AA2024, Si and Fe of the alloy were controlled at same level; Mn and Mg were controlled at low limit of AA2024 alloy; Cu is selected at low level (1.1-2.2%). Compared to hotbands of AA5xxx and AA3xxx alloys, characteristic after annealing at different temperatures of the hotband is very different with some interesting findings. The findings would affect potentially and importantly subsequent processing (such as cold rolling, solid solution heat treatment, quenching, forming, and aging) for application (replace AA5xxx-O sheet) in high strength and low-cost auto forming parts and sheets.

3:45 PM  
NOW ON-DEMAND ONLY – Effect of Homogenization on Anodic Film and Electrochemical Behavior of an A535 Alloy after Sealing with Stearic Sealant: Suwaree Chankitmunkong1; Dmitry Eskin2; Chaowalit Limmaneevichitr3; Phromphong Pandee3; Nattarat Kengkla3; Jirakit Athchasiri3; Tanawat Tanawansombat3; Napadol Parnlasarn3; Onnjira Diewwanit3; 1King Mongkut's Institute of Technology Ladkrabang; 2Brunel University; 3King Mongkut's University of Technology Thonburi
    Almag 35 (A535) is a commercial aluminum alloy intended for a number of marine components, which is mainly justified by its excellent castability and corrosion resistance. However, the most important factor for corrosion resistance is the formation of intermetallics that can lead the defects in the oxide film and substrate, as well as activate the corrosion reaction. The characteristics of a sealant on the anodic film was investigated in this work. The alloy was subjected to homogenization at 400 oC for 5 h to improve the uniformity of the anodic oxide film due to the decreased number of intermetallics as a result of dissolving in the matrix. It also improved the hardness of this alloy. Electrochemical measurements were conducted to investigate the corrosion behavior. The effects of intermetallics and stearic sealing on characteristics of the oxide layer are discussed.