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Study on the Microstructure and Corrosion Behavior of Dissimilar Aluminum Alloy Welded Joints Formed Using Laser Welding.
Materials (Basel)
December 2024
Dongfeng Liuzhou Automobile Co., Ltd., Liuzhou 545005, China.
This study investigates the evolution mechanisms and electrochemical corrosion behavior of laser-welded joints (WJs) between 6063 and 6082 dissimilar aluminum alloys under varying welding powers. The analysis focused on the microstructure of the weld metal zone (WMZ), its grain boundary (GB) features, and its electrochemical corrosion properties. Data from the experiments indicate that a higher laser power (LP) leads to an increase in grain size within the WMZ.
View Article and Find Full Text PDFGrain Boundaries Control Lithiation of Solid Solution Substrates in Lithium Metal Batteries.
Adv Sci (Weinh)
December 2024
Max Planck Institute for Sustainable Materials, 40237, Düsseldorf, Germany.
The development of sustainable transportation and communication systems requires an increase in both energy density and capacity retention of Li-batteries. Using substrates forming a solid solution with body-centered cubic Li enhances the cycle stability of anode-less batteries. However, it remains unclear how the substrate microstructure affects the lithiation behavior.
View Article and Find Full Text PDFGrain rotation mechanisms in nanocrystalline materials: Multiscale observations in Pt thin films.
Science
October 2024
Department of Materials Science and Engineering, University of California, Irvine, CA, USA.
Article Synopsis
- Near-rigid-body grain rotation is significant during processes like grain growth, recrystallization, and plastic deformation in nanocrystalline materials, but its mechanisms have been unclear for decades.
- New evidence shows that grain rotation happens due to the movement of disconnections along grain boundaries in platinum thin films.
- Advanced microscopy techniques reveal a statistical link between grain rotation and changes in grain size, highlighting the role of shear-coupled grain boundary migration in this phenomenon.
Intergranular fracture, grain-boundary structure, and dislocation-density interactions in FCC bicrystals.
Sci Rep
September 2024
Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA.
A dislocation-density based crystalline plasticity (DCP) and nonlinear finite element (FE) analysis were used to predict, and fundamentally understand how and why fracture nucleation and propagation are related to the interrelated microstructural mechanisms of dislocation-density pileups, GB structure, orientation, and total and partial dislocation density interactions within and adjacent for a random low angle grain boundary (LAGB) and a random high angle GB (HAGB). The GB orientations and structures were obtained from micropillar experiments, such that LAGBs and the HAGBs can be accurately represented and used for the modeling predictions. The normal stress, density of pileups, and dislocation-density accumulation along and within the GB were higher for the low angle GB bicrystal.
View Article and Find Full Text PDFIntercritically Annealed Medium-Manganese Steel: Insights into Microstructural and Microtextural Evolution, Strain Distribution, and Grain Boundary Characteristics.
Materials (Basel)
June 2024
Division of Advanced Materials Engineering, Research Center of Advanced Material Development, Jeonbuk National University, Jeonju 54896, Republic of Korea.
Aluminum-incorporated medium-manganese steel (MMnS) has potential for lightweight transport applications owing to its impressive mechanical properties. Increasing the austenite volume fraction and making microstructural changes are key to manufacturing MMnS. However, the grain boundary character and strain distribution of intercritically annealed low-density MMnS have not been extensively scrutinized, and the effects of crystallographic texture orientation on tensile properties remain ambiguous.
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