Journal of Magnesium and Alloys最新文献_第6页

Interpretable machine learning design for concurrent and significant enhancement of the mechanical properties and corrosion resistance of low-density Mg-Li alloys 同时显著提高低密度Mg-Li合金力学性能和耐腐蚀性的可解释机器学习设计

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.10.014

Lei Jiang , Wentao Zhoutai , Xinbiao Zhang , Zheng Shi , Zhilin Han , Yujie Cui , Jianxin Xie

Designing low-density, high-strength Mg-Li alloys is a major challenge in achieving extreme lightweighting of high-end equipment. This study proposes an interpretable machine learning strategy to simultaneously enhance the mechanical properties and corrosion resistance of Mg-Li alloy. Key alloy factors (KAFs) influencing ultimate tensile strength (UTS), elongation (EL), and corrosion rate (CR) were identified through alloy factor construction and screening. Using KAFs and processing parameters as inputs, gradient boosting regression models for UTS, EL, and CR were established, achieving the coefficients of determination of test-set above 0.85. Then, SHapley Additive exPlanations (SHAP) analysis quantified the impact of KAFs, and an element evaluation method was established to identify Al, Si, Ca, and Zn as candidates for alloy design. Finally, three new alloys were designed via multi-objective optimization. In the hot-extruded state, they exhibited UTS of 253∼273 MPa, EL of 18.4%∼27.9%, CR of 0.55∼1.61 mg/(cm²·day), and ρ of 1.49∼1.54 g/cm³. Compared to LAZ103, the new alloys show 34%∼44% higher UTS, 35%∼79% lower CR, and comparable ρ. Microstructural analysis revealed increased α-Mg, decreased β-Li, reduced coarse secondary phases, and fine Ca-/Si-rich precipitates which are conducive to grain refinement and dislocation density increasing, synergistically enhancing comprehensive property.

设计低密度、高强度Mg-Li合金是实现高端设备极轻量化的主要挑战。本研究提出了一种可解释的机器学习策略，以同时提高Mg-Li合金的力学性能和耐腐蚀性。通过合金因子构建和筛选，确定了影响合金极限抗拉强度（UTS）、伸长率（EL）和腐蚀速率（CR）的关键合金因子（KAFs）。以KAFs和加工参数为输入，建立了UTS、EL和CR的梯度增强回归模型，实现了测试集的决定系数在0.85以上。然后，SHapley加性解释（SHAP）分析量化了KAFs的影响，并建立了一种元素评价方法来识别Al， Si， Ca和Zn作为合金设计的候选元素。最后，通过多目标优化设计了三种新型合金。在热挤压状态下，它们的UTS为253 ~ 273 MPa， EL为18.4% ~ 27.9%，CR为0.55 ~ 1.61 mg/(cm2·day)， ρ为1.49 ~ 1.54 g/cm3。与LAZ103相比，新合金的UTS提高了34% ~ 44%，CR降低了35% ~ 79%，ρ也相当。显微组织分析表明，α-Mg含量增加，β-Li含量降低，粗次生相减少，富Ca / si细相析出，有利于晶粒细化和位错密度增加，协同提高综合性能。

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引用次数: 0

Recent advances in magnesium and magnesium alloys for next-generation high-energy-density lithium rechargeable batteries 下一代高能量密度锂电池用镁及镁合金研究进展

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.10.020

Dong Hoon Kim , Minhe Kim , Changhoon Choi , Hee Jo Song , Dong-Wan Kim

Lithium metal has been considered the ultimate anode material in Li rechargeable batteries because of its exceptionally high theoretical specific capacity (3860 mAh g⁻¹) and extremely low redox potential (−3.04 V vs. standard hydrogen electrode). However, the uncontrollable formation of dendritic Li during Li plating/stripping cycling processes generates electrochemically disconnected Li chunks from the electrode, which consumes an active Li source in the electrolyte, thus degrading the electrolyte and leading to low Coulombic efficiency and safety concerns in Li rechargeable batteries. Therefore, the development of stable Li-metal anodes (LMAs) is required for highly reversible Li plating/stripping on the anode side. In this regard, magnesium metal and Mg-based alloys have attracted considerable attention as new LMAs because of their good compatibility with Li and high lithiophilicity. In this review, we introduce the recent advances and strategies for Mg-metal- and Mg-based alloy materials to achieve high durability in next-generation Li-ion batteries and all-solid-state batteries. In addition, we discuss the challenges in the development of Mg-based alloys and their future perspectives. The comprehensive understanding of Mg-metal- and Mg-based alloy materials for LMAs in this review will offer the reader the inspiration to establish an effective strategy for future research.

由于其极高的理论比容量（3860 mAh g - 1）和极低的氧化还原电位（与标准氢电极相比为- 3.04 V），锂金属一直被认为是锂可充电电池的终极阳极材料。然而，在锂电镀/剥离循环过程中，树枝状锂的不可控形成会从电极上产生电化学分离的锂块，这会消耗电解液中的活性锂源，从而降低电解液的性能，导致锂可充电电池的库仑效率低和安全性问题。因此，开发稳定的锂金属阳极（LMAs）是实现阳极侧高可逆镀/剥离锂的必要条件。金属镁和镁基合金具有良好的锂离子相容性和较高的亲石性，作为新型LMAs受到了广泛的关注。本文介绍了镁金属和镁基合金材料在下一代锂离子电池和全固态电池中实现高耐久性的最新进展和策略。此外，我们还讨论了镁基合金发展面临的挑战和未来的展望。本文通过对镁金属和镁基合金材料的全面了解，为今后的研究提供了有效的策略。

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引用次数: 0

Clarifying interfacial microstructures of Ti particle reinforced Mg-Zn-Mn composites to achieve good strength-ductility synergy 澄清Ti颗粒增强Mg-Zn-Mn复合材料的界面微观结构，实现良好的强度-延性协同

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.03.030

Jichuan Fan , Hong Yang , Wenlong Xie , Gong Chen , Yunxuan Zhou , Kaihong Zheng , Jun Xu , Jun Tan , Xianhua Chen , Fusheng Pan

In the field of particle reinforced magnesium (Mg) matrix composites (MMCs), the interfacial microstructures between reinforcements and Mg matrix are a subject of interest for most researchers. In this work, the 2 wt.% Ti particle reinforced Mg-6Zn alloy composites with different contents (0, 0.5, 1, 1.5, 2 wt.%) of Mn were prepared using semi-solid stirring assisted ultrasonic treatment followed by hot extrusion. With the increment of Mn element, the characteristics of mixed-grain structure became obvious and the DRX was inhibited. Meanwhile, the interfacial product gradually changed from MgZn₂ to Mn₂Ti. The tensile test demonstrated that the 2Ti/Mg-6Zn-1.5Mn composite exhibited an excellent strength-ductility synergy, achieving the highest yield stress (YS), ultimate tensile stress (UTS) of 239 MPa, 366 MPa, respectively, along with a notable elongation (El.) of 20.6%. The increased strength is mainly due to the grain refinement, the precipitation strengthening, the HDI strengthening and the strong interfacial bonding including the tightly Ti/Mn₂Ti bonding and the Mn₂Ti/Mg coherent orientation relationship. The ideal El. is the result of fine/coarse bimodal structure and the proper interfacial reaction, which can reduce the occurrence of cracks.

在颗粒增强镁基复合材料（MMCs）中，增强材料与镁基之间的界面微观结构一直是研究人员感兴趣的课题。采用半固体搅拌辅助超声处理和热挤压法制备了Mn含量分别为0、0.5、1、1.5、2 wt.%的2 wt.% Ti颗粒增强Mg-6 Zn合金复合材料。随着Mn元素的增加，混合晶粒结构的特征变得明显，DRX受到抑制。同时，界面产物由MgZn2逐渐转变为Mn2Ti。拉伸试验表明，2Ti/Mg-6Zn-1.5Mn复合材料具有良好的强度-塑性协同效应，最高屈服应力（YS）为239 MPa，极限拉伸应力（UTS）为366 MPa，延伸率（El）为20.6%。强度的提高主要是由于晶粒细化、析出强化、HDI强化和强界面结合，包括紧密的Ti/Mn2Ti结合和Mn2Ti/Mg共格取向关系。理想的El。是细/粗双峰结构和适当的界面反应的结果，这可以减少裂纹的发生。

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引用次数: 0

Comparison of the insertion-extraction of Ca and Mg ions in amorphous CaMn2O4 post-spinel-based cathodes in aqueous media 水介质中无定形CaMn2O4尖晶石后阴极中Ca和Mg离子的插拔比较

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.09.022

Carmen Miralles, Teresa Lana-Villarreal, Roberto Gómez

Nowadays, multivalent batteries are not widely commercialized in contrast with monovalent batteries because their development faces more obstacles, which partly derive from the typically higher charge density of multivalent ions. This property results in poor capacity retention and reversibility, and low coulombic efficiency since the insertion of multivalent ions strongly destabilizes the host structure. To overcome these issues, a close-to-amorphous cathode material has been prepared containing cations (Ca) larger than those to be inserted (Mg). Specifically, low-crystallinity CaMn₂O₄ (CMO) has been prepared and tested as a cathode for aqueous magnesium and calcium batteries. Employing XPS and ICP-OES, calcium and magnesium ions are shown to be inserted-extracted into-from the cathode, the performance being better for magnesium insertion because of its higher diffusion coefficient. In situ Raman analysis reveals that CMO evolves into a birnessite-type structure during the initial electrochemical cycles in both aqueous magnesium and calcium media. The gravimetric capacity obtained for cycle 50 at 263 mA g^-1 in aqueous 1.0 M Mg(NO₃)₂ has a value of 93 mAh g^-1, while for aqueous 1.0 M Ca(NO₃)₂, it is only of 46 mAh g^-1. The results obtained for the magnesium electrolyte compare well with other cathode materials based on manganese oxides.

目前，与一价电池相比，多价电池的发展面临着更多的障碍，部分原因在于多价离子通常具有更高的电荷密度。这种性质导致容量保持和可逆性差，库仑效率低，因为多价离子的插入会强烈破坏宿主结构的稳定性。为了克服这些问题，已经制备了一种接近无定形的阴极材料，其中含有比要插入的阳离子（Mg）更大的阳离子（Ca）。具体地说，制备了低结晶度CaMn2O4 (CMO)，并对其作为镁钙水电池的阴极进行了测试。利用XPS和ICP-OES分析表明，钙离子和镁离子从阴极插入-提取，镁离子的插入性能较好，因为镁离子具有较高的扩散系数。原位拉曼分析表明，CMO在镁水和钙介质中初始电化学循环过程中均演变为birnite型结构。在1.0 M Mg(NO3)2水溶液中，在263 mA g-1下循环50的重量容量为93 mAh g-1，而在1.0 M Ca(NO3)2水溶液中，其重量容量仅为46 mAh g-1。所得结果与其他基于锰氧化物的正极材料比较良好。

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引用次数: 0

Magnesium for hydrogen energy: Prospects and challenges 氢能源用镁：前景与挑战

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.12.001

Min Zhu

引用次数: 0

Insight into the hot deformation behavior and recrystallization mechanism of Mg-Y-RE alloys based on machine learning 基于机器学习的Mg-Y-RE合金热变形行为及再结晶机理研究

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.09.027

Zheng Wu , Zheng Wang , Jian Zeng , Minglei Zhang , Kang Yao , Xiaoya Chen , Quanan Li , Baosheng Liu

The hot deformation behavior of magnesium (Mg) alloys is significantly governed by the multi-physics coupling effects of temperature (T), strain rate (

\dot{ε}

) and strain (ε), resulting in flow behavior that exhibits pronounced nonlinearity and multi-scale complexity. This study systematically investigates the hot deformation behavior of Mg-Y-Nd-(Sm)-Zr alloys. Sm alloying promotes recrystallization. The flow stress of Sm-containing alloys declines sharply towards a steady state after reaching its peak value. To overcome the limitations of the Arrhenius-type constitutive (AC) model in predicting complex nonlinear flow behavior, the AC and data hybrid informed neural network (ACINN) model is developed. This approach enhances the predictive accuracy and extends the applicability of the traditional AC model. The evolution of microstructure and recrystallization behavior under hot deformation conditions are investigated based on results from electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The relationship between the power dissipation factor (η) and recrystallization behavior is further examined using K-means clustering analysis. The results demonstrate that dynamic recrystallization (DRX) behavior varies with the η value, comprising four distinct regimes: dynamic recovery (DRV), discontinuous dynamic recrystallization (DDRX) dominance, continuous dynamic recrystallization (CDRX) dominance and complete dynamic recrystallization. This analysis presents a new perspective for studying the hot deformation processes of Mg alloys.

镁合金的热变形行为受温度(T)、应变速率（ε˙ε˙）和应变（ε）的多物理场耦合影响，导致流变行为表现出明显的非线性和多尺度复杂性。本研究系统地研究了Mg-Y-Nd-(Sm)- zr合金的热变形行为。Sm合金促进再结晶。含sm合金的流变应力在达到峰值后急剧下降，趋于稳定。为了克服arrhenius型本构（AC）模型在预测复杂非线性流动行为方面的局限性，提出了AC与数据混合通知神经网络（ACINN）模型。该方法提高了预测精度，扩展了传统交流模型的适用性。利用电子背散射衍射（EBSD）和透射电子显微镜（TEM）研究了热变形条件下的显微组织演变和再结晶行为。利用k均值聚类分析进一步研究了功率耗散系数（η）与再结晶行为之间的关系。结果表明：动态再结晶（DRX）行为随η值的变化而变化，表现为动态恢复（DRV）、不连续动态再结晶（DDRX）为主、连续动态再结晶（CDRX）为主和完全动态再结晶4种模式。这为镁合金热变形过程的研究提供了一个新的视角。

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引用次数: 0

Indexation of coordinated bursts of plasticity in Mg-4Zn via high-energy X-rays 高能x射线对Mg-4Zn塑性协调爆发的指标化

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.09.037

Jun Wang , Alban de Vaucorbeil , Sitarama R. Kada , Andrew Stevenson , Peter A. Lynch , Matthew R. Barnett

Our understanding of grain-level bursts of plasticity in polycrystals remains limited by current techniques. By employing a modified Synchrotron transmission X-ray Laue diffraction method (beam size larger than the grain size), we tracked grain rotations for the first 1 % of tensile strain, in 4400 time steps. We indexed 33 grains and quantified the magnitude and frequency of intermittent bursts of grain rotation. We interpret these events in terms of bursts of plastic deformation. The events are highly coordinated amongst nearby grains, and their frequency and magnitude, as well as the number of grains participating, peaked at around the onset of full plasticity. At this point, 7 out of the 10 indexed grains with orientations favorable for twinning showed significant drops in diffracted intensity (a mean value of 8 %), due to twin induced re-orientation. For other orientations, 20 out of 23 grains displayed bursts attributable to lattice dislocation glide (interpreted in terms of basal and prismatic 〈a〉 slip). The mean value of the magnitude of these bursts is ∼0.08°, implying accumulated shear strains of the order of 3 × 10^–3. These bursts, in many cases, were due to the activation of more than a single slip/twin system within the grain, and co-ordination amongst neighboring grains also involved collaboration between slip and twinning events.

我们对多晶中晶粒级塑性爆发的理解仍然受到当前技术的限制。通过采用改进的同步加速器透射x射线劳埃衍射法（光束尺寸大于晶粒尺寸），我们在4400个时间步长中跟踪了拉伸应变前1%的晶粒旋转。我们对33种粮食进行了索引，并量化了粮食轮作间歇爆发的幅度和频率。我们用塑性变形的爆发来解释这些事件。这些事件在附近的颗粒之间高度协调，它们的频率和强度以及参与的颗粒数量在完全可塑性开始时达到峰值。此时，由于孪晶诱导的再取向，10个取向有利于孪晶的晶粒中有7个的衍射强度显著下降（平均值为8%）。对于其他取向，23个晶粒中有20个显示出可归因于晶格位错滑动的破裂（根据基面和棱柱面< a >滑移来解释）。这些爆发幅度的平均值为~ 0.08°，意味着累积的剪切应变为3 × 10-3数量级。在许多情况下，这些爆发是由于颗粒内多个滑移/孪晶系统的激活，相邻颗粒之间的协调也涉及滑移和孪晶事件之间的协作。

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引用次数: 0

Synergistic improvement of strength and ductility in graphene nanoplatelets/Mg-14Li-1Al composites via heterogeneous phase regulation 非均相调控对石墨烯纳米片/Mg-14Li-1Al复合材料强度和延展性的协同改善

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.11.004

Xiaoyan Feng , Chen Xu , Bin Sun , Ruizhi Wu , Zhe Yu , Xiaochun Ma , Wenbin Liu , Huajie Wu , Legan Hou , Jun Wang

This study innovatively proposed a synergistic processing strategy combining accumulative roll bonding (ARB) and friction stir processing (FSP), and successfully prepared graphene nanosheets/Mg-14Li-1Al (GNPs/LA141) composites with both high strength and high plasticity. The multi-scale heterogeneous synergistic strengthening mechanism of the composite material was systematically revealed. During the FSP process, GNPs stimulates dynamic recrystallization (DRX) and restricts grain growth, achieving significant grain refinement. An α-Mg/β-Li phase structure with Burgers orientation relationship was formed in the matrix, among which the plate-like α-Mg phase was first reported in the LA141 alloy. By optimizing the orientation distribution of GNPs through the rolling process, the GNPs/LA141 composite exhibits excellent mechanical properties: a yield strength of 237 MPa, a tensile strength of 259 MPa, an elongation of 12.1% and a specific strength reaching 195 kN·m/kg. The α-Mg phase, in synergy with Al-rich precipitates, strengthens the composite through the Orowan mechanism, while micro–nano layered GNPs enhance its strength via the load transfer mechanism. Meanwhile, during the crack propagation process, the bridging and pull-out behavior of GNPs increases the energy required for fracture and effectively coordinates the synergistic improvement of strength and plasticity. This work provides an integrated control strategy of structure and performance for the design of multi-scale reinforced metal matrix composites (MMCs).

本研究创新性地提出了累积滚合（ARB）和搅拌摩擦加工（FSP）相结合的协同加工策略，成功制备了高强度、高塑性的石墨烯纳米片/Mg-14Li-1Al （GNPs/LA141）复合材料。系统地揭示了复合材料的多尺度非均相协同强化机理。在FSP过程中，GNPs刺激动态再结晶（DRX），限制晶粒长大，实现显著的晶粒细化。在基体中形成具有Burgers取向关系的α-Mg/β-Li相结构，其中在LA141合金中首次报道了类板α-Mg相。通过轧制工艺优化GNPs的取向分布，GNPs/LA141复合材料的屈服强度为237 MPa，抗拉强度为259 MPa，伸长率为12.1%，比强度达到195 kN·m/kg。α-Mg相通过Orowan机制与富al相协同增强复合材料的强度，而微纳层状GNPs则通过载荷传递机制增强复合材料的强度。同时，在裂纹扩展过程中，GNPs的桥接和拉拔行为增加了断裂所需的能量，有效地协调了强度和塑性的协同提高。本研究为多尺度增强金属基复合材料的结构和性能设计提供了一种综合控制策略。

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引用次数: 0

Microstructure, mechanical properties and damping behavior of novel Mg-Ga-Zn alloys fabricated by medium-high strain rate rolling 中高应变率轧制新型镁-镓-锌合金的微观结构、力学性能和阻尼行为

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2024.09.009

Wensen Huang , Jihua Chen , Hongge Yan , Weijun Xia , Fei Zhao

This study examines the grain characteristics, dynamic precipitation phase characteristics, and texture evolution of Mg-Ga-xZn alloys produced through medium-high strain rate rolling. It investigates the impact of Zn on the mechanical and damping properties of Mg-Ga sheet. The addition of Zn reduces the solid solubility of Ga in α-Mg, facilitating dynamic precipitation, grain refinement, and weakening of the basal texture of the sheet, ultimately enhancing strength and damping performance. The yield strength of the sheet initially increases and then decreases with increasing Zn content. The Mg-5Ga-0.6 Zn alloy demonstrates the best overall mechanical properties, with a yield strength, tensile strength, and elongation of 221 MPa, 304 MPa, and 28.6%, respectively, primarily attributed to fine-grained strengthening. Damping performance at low strain amplitudes also follows a similar trend with increasing Zn content, with Mg-5Ga-0.6 Zn showing the highest damping values. The study suggests that the decrease in damping performance due to Zn can be linked to the reduced solid solubility of Ga in α-Mg. Specifically, at a strain amplitude of 1 × 10^–3, the damping values Q^-1 of Mg-5Ga, Mg-5Ga-0.6 Zn, and Mg-5Ga-1.2 Zn alloy sheets are 0.0167, 0.0152, and 0.0174, respectively. These findings have implications for the development of bio-implantable magnesium alloys with high damping properties.

本研究探讨了通过中高应变率轧制生产的 Mg-Ga-xZn 合金的晶粒特征、动态沉淀相特征和纹理演变。研究还探讨了 Zn 对 Mg-Ga 板材机械性能和阻尼性能的影响。Zn 的加入降低了 Ga 在 α-Mg 中的固溶性，促进了动态析出、晶粒细化和薄片基底纹理的弱化，最终提高了强度和阻尼性能。薄片的屈服强度最初会随着锌含量的增加而增加，然后降低。Mg-5Ga-0.6 Zn 合金的整体机械性能最好，屈服强度、抗拉强度和伸长率分别为 221 兆帕、304 兆帕和 28.6%，这主要归功于细晶粒强化。随着锌含量的增加，低应变振幅下的阻尼性能也呈类似趋势，Mg-5Ga-0.6 Zn 的阻尼值最高。研究表明，Zn 导致的阻尼性能下降与 Ga 在 α-Mg 中的固溶性降低有关。具体来说，在应变振幅为 1 × 10-3 时，Mg-5Ga、Mg-5Ga-0.6 Zn 和 Mg-5Ga-1.2 Zn 合金薄片的阻尼值 Q-1 分别为 0.0167、0.0152 和 0.0174。这些发现对开发具有高阻尼特性的生物植入性镁合金具有重要意义。

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引用次数: 0

New insights into combined thermal and vibration softening of magnesium alloy in rotational vibration assisted incremental sheet forming 镁合金在旋转振动辅助增量板料成形中的热和振动联合软化新见解

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-12-01 DOI: 10.1016/j.jma.2025.09.016

Hui Zhu , Xiaohan Zeng , Hui Long , João Quinta da Fonseca

With the generation of both localised thermal and vibration in incremental sheet forming (ISF) by novel tool designs, rotational vibration assisted ISF (RV-ISF) can achieve significant force reduction and material softening. However, the combined thermal and vibration softening in RV-ISF is unclear. By evaluating the similarities and differences of friction stir ISF (FS-ISF) and RV-ISF, this study develops a novel approach to decouple and quantify the thermal and vibration softening effects in RV-ISF of AZ31B-H24, providing new insights into underlying thermal and vibration softening mechanism. Experimental results reveal that in RV-ISF of AZ31B-H24 the thermal softening due to frictional heating dominates with 45 ∼ 65 % of softening, while the vibration effect only contributes up to 15 % of softening, from the conventional ISF, depending on the tool designs and tool rotational speed. The double-offset tool (T2) produces greater vibration softening than the three-groove tool (T3) owing to the higher vibration amplitude of the T2 tool. An increase in tool rotational speed primarily enhances thermal softening with only marginal changes to the vibration effect. Microstructural analysis suggests that with average grain size of 0.94 µm at the top layer, RV-ISF with T3 and 3000 rpm is more effective for microstructure refinement than that by FS-ISF, especially on the tool-sheet contact surface, which confirms the occurrence of surface shearing. This refinement is a result of the reduced recrystallisation degree, 71.8 % at the top bottom layer. Compared with FS-ISF, RV-ISF can lead to not only higher geometrically necessary dislocation density, but also higher fraction of low-angle grain boundaries, indicating that softening mechanism due to localised vibration effect is resulted from the enhanced rearrangement and annihilation of dislocations. These findings contribute to new understanding of the thermal and vibration softening effects in RV-ISF of AZ31B-H24 and offer a theoretical foundation for the tool design and process optimisation.

随着新型工具设计在增量板成形（ISF）过程中产生局部热和振动，旋转振动辅助ISF （RV-ISF）可以实现显著的力减小和材料软化。然而，RV-ISF的热和振动联合软化机理尚不清楚。通过对摩擦搅拌ISF （FS-ISF）和RV-ISF的异同进行评价，本研究提出了一种新的方法来解耦和量化AZ31B-H24的RV-ISF的热和振动软化效应，为研究潜在的热和振动软化机制提供了新的见解。实验结果表明，在AZ31B-H24的RV-ISF中，摩擦加热引起的热软化占主导地位，软化率为45 ~ 65 %，而振动效应仅占传统ISF的15 %，具体取决于刀具设计和刀具转速。由于T2刀具的振动幅值更高，双偏置刀具（T2）比三槽刀具（T3）产生更大的振动软化。刀具转速的增加主要增强了热软化，振动效果只有微小的变化。显微组织分析表明，当表层平均晶粒尺寸为0.94µm时，T3和3000 rpm的RV-ISF比FS-ISF更有效地细化了微观组织，特别是在刀片接触面，这证实了表面剪切的发生。这种细化是由于上层和下层的再结晶度降低了71.8 %。与FS-ISF相比，RV-ISF不仅可以产生更高的几何必要位错密度，而且可以产生更高的低角度晶界，这表明局部振动效应导致的软化机制是位错重排和湮灭增强的结果。这些发现有助于对AZ31B-H24 RV-ISF的热软化和振动软化效应有新的认识，并为工具设计和工艺优化提供理论基础。

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引用次数: 0