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Accelerated design of high-performance Mg-Mn-based magnesium alloys based on novel bayesian optimization

Journal of Magnesium and Alloys 2024年第2期12卷 750-766页

作者： Xiaoxi Mi Lili Dai Xuerui Jing Jia She bjørn holmedal Aitao Tang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Southwest Technology and Engineering Research Institute Chongqing 400039China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Department of Materials Science and Engineering Norwegian University of Science and Technology(NTNU)Trondheim 7051Norway

Magnesium(Mg),being the lightest structural metal,holds immense potential for widespread applications in various *** development of high-performance and cost-effective Mg alloys is crucial to further advancing their commercial *** the rapid advancement of machine learning(ML)technology in recent years,the“data-driven''approach for alloy design has provided new perspectives and opportunities for enhancing the performance of Mg *** paper introduces a novel regression-based Bayesian optimization active learning model(RBOALM)for the development of high-performance Mg-Mn-based wrought *** employs active learning to automatically explore optimal alloy compositions and process parameters within predefined ranges,facilitating the discovery of superior alloy *** model further integrates pre-established regression models as surrogate functions in Bayesian optimization,significantly enhancing the precision of the design *** RBOALM,several new high-performance alloys have been successfully designed and ***,after mechanical property testing of the designed alloys,the Mg-2.1Zn-2.0Mn-0.5Sn-0.1Ca alloy demonstrates exceptional mechanical properties,including an ultimate tensile strength of 406 MPa,a yield strength of 287 MPa,and a 23%fracture ***,the Mg-2.7Mn-0.5Al-0.1Ca alloy exhibits an ultimate tensile strength of 211 MPa,coupled with a remarkable 41%fracture elongation.

关键词： Mg-Mn-based alloys High-performance Alloy design Machine learning Bayesian optimization

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Influence of dispersoids on grain subdivision and texture evolution in aluminium alloys during cold rolling

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2072-2078页

作者：赵庆龙 bj?rn holmedal Department of Materials Science and Engineering Norwegian University of Science and Technology

Al-Mn alloys containing similar amounts of solutes but various dispersoid densities were cold rolled. The grain subdivision and micro-texture were examined by electron backscatter diffraction and orientation imaging microscopy. Macro-texture was measured by X-ray diffraction. It is found that a high density of fine dispersoids enhances the development of the copper and S textures at large strains （～3）, and also induces a higher fraction of high-angle grain boundaries. At smaller strains, the texture and high-angle grain boundaries are not evidently influenced by the density of dispersoids. It is suggested that the texture evolution, which is enhanced by dispersoid pinning effect, contributes to the grain subdivision and the formation of high-angle grain boundaries.

关键词： aluminium alloys grain boundary texture deformation microstructure

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An explicit integration scheme for hypo-elastic viscoplastic crystal plasticity

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2401-2407页

作者： K.ZHANG B.holmedal S.DUMOULIN O.S.HOPPERSTAD Department of Materials Science and Engineering Norwegian University of Science and Technology SINTEF Materials and Chemistry Department of Structural Engineering Norwegian University of Science and Technology Structural Impact Laboratory (SIMLab) Center for Research-based InnovationNorwegian University of Science and Technology

An explicit integration scheme for rate-dependent crystal plasticity （CP） was developed. Additive decomposition of the velocity gradient tensor into lattice and plastic parts is adopted for describing the kinematics; the Cauchy stress is calculated by using a hypo-elastic formulation, applying the Jaumann stress rate. This CP scheme has been implemented into a commercial finite element code （CPFEM）. Uniaxial compression and roiling processes were simulated. The results show good accuracy and reliability of the integration scheme. The results were compared with simulations using one hyper-elastic CPFEM implementation which involves multiplicative decomposition of the deformation gradient tensor. It is found that the hypo-elastic implementation is only slightly faster and has a similar accuracy as the hyper-elastic formulation.

关键词： crystal plasticity hypo-elasticity hyper-elasticity forward Euler integration

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性别差异和动态磁敏感对比增强MRI肿瘤血流量与直肠癌放化疗后的治疗反应和长期生存率相关

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国际医学放射学杂志 2021年第1期44卷 105-106页

作者： K.M.Bakke S.Meltzer E.Gr?vik A.Neg?rd S.H.holmedal K.I.Gjesdal 李晨菲

摘要MRI是直肠癌分期的标准工具,然而有必要进行更精确的诊断试验,以评估决定治疗结果的肿瘤生物学特征。肿瘤血流灌注和缺氧是2个重要的特征,但目前临床应

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