徐子涵 Zihan Xu

• 非平衡快速凝固热力学：建立了温度梯度与溶质偏析协同判据，确立了非平衡凝固条件下枝晶向球状晶转变的临界对流强度与界面过冷度窗口。Thermodynamics: Established critical convective intensity criteria for dendrite-to-globular transition.
• 代表性一作论文：Dynamic Interface Renewal Enables Stable Globular Grain Growth and Enhanced Solute Retention in Melt Impinging Solidification Manufacturing.1st-Author Paper: Dynamic Interface Renewal Enables Stable Globular Grain Growth and Enhanced Solute Retention in Melt Impinging Solidification Manufacturing.

• 组织与偏析协同控制：成功研制出 3000kg 级工业铝合金板锭，全截面平均晶粒＜80 μm，纵横截面宏观成分偏析稳定控制在 3% 以内，批次偏离度＜10%，彻底根除粗大树枝晶缺陷。Microstructure & Segregation Control: Fabricated 3000-kg industrial slabs with average grain < 80 μm, macrosegregation < 3%, and batch deviation < 10%, eliminating coarse dendrites.
• 代表性一作论文：Melt Impinging Solidification Manufacturing Enables Highly Homogeneous and High-Performance Large-Sized Alloy Ingots.1st-Author Paper: Melt Impinging Solidification Manufacturing Enables Highly Homogeneous and High-Performance Large-Sized Alloy Ingots.

• 超细等轴晶组织：工业级 3000kg 板锭全截面平均晶粒尺寸＜ 80 μm，批次偏离度＜ 10%，彻底根除传统半连续铸造“三晶区”组织不均匀问题。Equiaxed Microstructure: Average grain size < 80 μm across entire cross-section, eliminating three-crystal zones.
• 超低宏观偏析：纵向与横截面宏观成分偏析稳定控制在 3% 以内，保障后续大型航空构件热轧变形不开裂。Ultra-Low Segregation: Compositional macrosegregation < 3% across length and width.
• 代表性一作论文：Melt Impinging Solidification Manufacturing Enables Highly Homogeneous and High-Performance Large-Sized Alloy Ingots.1st-Author Paper: Melt Impinging Solidification Manufacturing Enables Highly Homogeneous and High-Performance Large-Sized Alloy Ingots.

• 形变协调机理：球状晶边界平滑且大角晶界比例高，有效阻断微裂纹沿晶扩展路径。Compatibility: High-angle boundary networks retard crack propagation.
• 代表性一作论文：Synergistic Enhancement of Strength and Ductility in 7085 Alloy through Globular Grain Deformation Compatibility and Dense Precipitation.1st-Author Paper: Synergistic Enhancement of Strength and Ductility in 7085 Alloy through Globular Grain Deformation Compatibility and Dense Precipitation.

• 发表期刊：Journal of Materials Science & Technology (JCR Q1, IF 10.9), Vol. 184, 2024, 122-135.Journal: JMST (JCR Q1, IF 10.9), 2024.
• 背应力强化：异构界面产生高几何必要位错（GNDs）堆积，提供显著额外背应力硬化效应，推迟拉伸塑性失稳。Back-Stress Hardening: Elevated GNDs at domain interfaces delay plastic instability.

• 机械柱塞精密驱动，杜绝气孔缺陷：针对传统气压差喷射易卷入气体产生凝固气孔的痛点，设计柱塞与坩埚密封储液腔机构，实现金属熔体的高精度稳定定量喷射与无气孔高致密成型。Mechanical Plunger Precision Extrusion: Replaces pneumatic jetting with a plunger-sealed reservoir to completely eliminate gas entrapment, achieving high-precision, pore-free dense metal droplet deposition.
• 动模温控协同，实现快速激冷赋型：在坩埚底部集成多自由度联动且内置循环水冷管路的冷却模具系统，实现熔体射流冲击沉积微区的高效激冷与三维精密轨迹快速凝固赋型。Dynamic Chilling-Mold Multi-Field Forming: Integrates a multi-axis motion stage and internal water-cooled chill mold beneath the nozzle, enabling rapid local cooling and precision additive profiling.

• 纳米析出相精确调控，突破强韧导电平衡：优化 Al-Mg-Si 系微合金化配比并精细调控时效纳米 β'' 相高密度弥散析出（数密度≥0.8×10²³/m³），在保证导电率＞57.5% IACS 的前提下，实现抗拉强度＞230 MPa、延伸率＞15% 的卓越性能。Cooperative High Conductivity & Strength: Optimizes Al-Mg-Si composition and dense nanoscale β'' precipitate dispersion (≥0.8×10²³/m³), achieving >57.5% IACS conductivity with >230 MPa tensile strength and >15% elongation.
• 多层紧固屏蔽与一体化短流程制备：构建由铝芯、绝缘层、机械缩合 8 系铝屏蔽管及耐候防护层组成的多层架构，配合端头超声波焊接方案，大幅提升抗弯折疲劳与抗腐蚀寿命，有力支撑新能源车与储能线束轻量化。Integrated Multi-Layer Shielding Architecture: Establishes a compact architecture of co-extruded insulation, mechanically crimped Al shielding tube, and ultrasonic welded terminals, significantly enhancing fatigue bending endurance.

• 突破传统铸造尺寸效应限制，成功研制出 3000kg 级工业铝合金板锭。Breaks conventional casting size effects, fabricating 3000-kg industrial slabs.
• 铸锭平均晶粒＜80 μm，纵横截面成分偏析稳定控制在 3% 以内。Average grain size < 80 μm with macrosegregation < 3%.

• 基于凝固界面稳定性理论，揭示强迫剪切对流使固液界面动态更新并剧烈减薄溶质边界层的动力学机理。Reveals that dynamic interface renewal under forced shear convection thins the solute boundary layer.
• 有效抑制枝晶侧向失稳分叉，确立了非平衡快速凝固条件下枝晶向球状晶转变的临界对流强度与界面过冷度判据。Suppresses dendritic branching and establishes criteria for dendrite-to-globular transition.

• 系统阐明球状晶平滑晶界消除了粗大二次相引起的应力集中，大角晶界网络有效阻断微裂纹沿晶扩展。Elucidates that smooth globular grains relieve stress concentrations and retard intergranular microcracks.
• 结合形变热处理激发动态再结晶与共格纳米析出相致密析出，实现超高强度与优异断裂韧性协同提升。Combines thermomechanical treatment to trigger dynamic recrystallization and coherent nano-precipitates.

• 提出硫酸盐介导均匀沉淀新策略，揭示弱碱与 SO₄²⁻ 协同调控 Al-O 配位（打破 AlO₆、富集 AlO₄ 低配位点），成功制备出纯度高于 99.86%、粒径 100~160 nm 的高分散球状 α-Al₂O₃ 纳米磨料。Proposed a sulfate-mediated homogeneous precipitation route where weak base and SO₄²⁻ synergistically regulate Al-O coordination, synthesizing highly dispersed spherical α-Al₂O₃ nanoparticles (100–160 nm, purity >99.86%).
• 突破传统均匀沉淀低浓度限制，将 Al³⁺ 反应浓度提高至 0.2 mol/L 仍保持高球形度与分散性，粉体兼具 ~3.8 nm 介孔与 38~40 m²/g 优异比表面积，显著提升产率与工业放大可行性。Overcame low-concentration limitations by increasing Al³⁺ to 0.2 mol/L while retaining sphericity, yielding powder with ~3.8 nm mesopores and 38–40 m²/g surface area for scalable production.
• 在硅晶圆化学机械抛光（CMP）中展现出优异平坦化性能，材料去除率（MRR）超过 150 nm/min，表面粗糙度（Ra）降至 0.3 nm 以下，达成高效超低损伤抛光。Demonstrated outstanding silicon wafer CMP performance with material removal rates above 150 nm/min and surface roughness below 0.3 nm.

• 系统评述了面向 1~2 nm 先进制程半导体与先进光学制造的 CMP 功能磨料前沿，深入阐明了 CeO₂、SiO₂、Al₂O₃ 及纳米金刚石等典型体系的“结构-界面-性能”构效关系。Comprehensive assessment of functional abrasives for 1–2 nm semiconductor nodes and optics, clarifying structure-property-performance relationships for CeO₂, SiO₂, Al₂O₃, and nanodiamonds.
• 针对 SiC、蓝宝石等难加工硬脆衬底，深入剖析了表面功能化、元素掺杂、核壳结构及多相复合/异质结构对材料去除率与原子级超光滑表面的协同调控机制。Analyzed mechanistic roles of surface functionalization, doping, core-shell structures, and nanocomposites in achieving high removal rates and defect-free surfaces on hard substrates like SiC and sapphire.
• 提出了涵盖固-液协同反应、催化氧化与界面缓冲特性的统一功能磨料设计框架，为开发高效、超低损伤、绿色可持续的新一代智能 CMP 抛光液系统提供了理论蓝图。Established a unified design framework across interfacial reactions, catalytic synergy, and dynamic buffering, providing a roadmap for next-generation intelligent, sustainable CMP systems.

• 针对超高强铝合金强塑性倒置瓶颈，创新性引入稀土 Y 元素构建微米级 Al₈Cu₄Y（促进形变动态再结晶形核）与纳米级 Al₃(Y, Zr)（强烈钉扎晶界抑制晶粒长大）的双尺度第二相协同体系，成功制备出片层异构组织（HLS）。Tackled the strength-ductility trade-off by adding rare earth Y to construct dual-scale second phases: Al₈Cu₄Y for dynamic recrystallization nucleation and Al₃(Y, Zr) for grain boundary pinning, achieving heterogeneous lamella structures.
• 通过精准调控第二相配比，使细晶体积分数达到 76.5 vol.%，获得抗拉强度 695 MPa 与延伸率 16.6% 的卓越综合力学性能。Precisely tuned second-phase fractions to achieve 76.5 vol.% fine grains, delivering superior tensile strength of 695 MPa and elongation of 16.6%.
• 阐明了异质形变诱导硬化（HDI）、高密度几何必需位错诱导主强化相 η' 定向析出，以及“异构组织-位错-析出相”多场耦合强化机制。Elucidated hetero-deformation-induced (HDI) hardening, preferential η' growth along dislocations, and composite strengthening in the 'heterostructure-dislocation-precipitate' architecture.

• 提出了基于机器学习的合金快速设计系统（ARDS），构建了包含 1967 组涵盖成分-热处理-多维性能的标准数据集，证实支持向量回归（SVR）在多目标力学性能预测中表现最优。Proposed an alloy rapid design system (ARDS) with 1,967 experimental samples, establishing that support vector regression (SVR) achieves the highest multi-property prediction accuracy.
• 借鉴生成对抗网络（GAN）算法实现了基于目标力学性能对微合金化成分与固溶时效工艺方案的反向智能定制，准确预测出抗拉强度 790 MPa、屈服强度 730 MPa 与延伸率 28% 的性能边界。Employed a GAN-inspired framework to inversely customize alloy composition and heat treatment for desired targets, predicting property upper limits of 790 MPa UTS, 730 MPa YS, and 28% elongation.
• 经实验熔炼制备出 ARDS 优化设计的超高强铝合金，实测抗拉强度达 764 MPa、屈服强度达 732 MPa、延伸率达 10.1%，有力验证了数据驱动加速合金研发的精准性。Experimentally fabricated an ARDS-designed aluminum alloy exhibiting 764 MPa UTS, 732 MPa YS, and 10.1% elongation, validating the system's high reliability.

• 研制出 Al-9.2Zn-2.2Mg-2.3Cu-0.2Sc-0.15Zr（7E36）超高强韧铝合金，抗拉强度达 773 MPa、屈服强度达 758 MPa、延伸率达 11.5%，屈服强度较无 Sc 合金提升 11.5%~14.6%，同时 7E55 合金延伸率高达 17.5%。Developed 7E36 alloy achieving 773 MPa UTS, 758 MPa YS, and 11.5% elongation (YS increased by 11.5%–14.6% over Sc-free alloy), with 7E55 reaching an exceptional 17.5% elongation.
• 阐明了增加 Zn 含量显著促进主强化相 η' 析出（增益屈服强度 35~55 MPa）；Sc/Zr 复合微合金化形成富 Sc 核-富 Zr 壳的纳米核壳结构 Al₃(Sc, Zr) 粒子，通过 Orowan 绕位机制和强烈钉扎亚晶界发挥协同强化。Elucidated that elevated Zn promotes dense η' precipitation, while Sc-rich core / Zr-rich shell Al₃(Sc, Zr) nanoprecipitates provide Orowan strengthening and subgrain boundary pinning.
• 揭示了形变过程中形成的异质结构与几何必要位错演化规律，通过修正的 Hall-Petch 关系定量解析了细晶强化、Al₃(Sc, Zr) 弥散强化、位错强化与 η' 析出强化的复合贡献机制。Identified heterostructure and dislocation evolution, quantitatively establishing yield strength increments via grain refinement, Al₃(Sc, Zr) dispersion, dislocation, and η' precipitation strengthening.

• 针对汽车车身用高强铝合金热冲压成形-淬火（HFQ）工艺，系统对比了自然时效+模拟烤漆（NA+SB）、预时效+烤漆（PA+SB）及峰值时效（T6）三种工艺路径对 7055 析出相演变的影响。Systematically compared three HFQ routes (NA+SB, PA+SB, and T6 peak-aging) on 7055 alloy precipitate evolution using HRTEM-SAED for automotive car body sheet applications.
• 阐明了 η 相析出的微观本质：GP Ⅰ 区演变为 GP Ⅱ 区，主强化相 η' 在其上直接形核增殖并转变为稳定 η 相；通过调控预时效温度与时间，为后续烤漆阶段提供了充足的高密度形核基底。Revealed the precipitation sequence where GP I zones evolve into GP II zones for direct η' nucleation; adjusting pre-aging parameters provides abundant nucleation sites for subsequent paint baking.
• 证实 HFQ + PA + SB 工艺可形成超高密度细小弥散的 η' 相及细小不连续分布的晶界相，最终板材抗拉强度达 660.1 MPa、屈服强度达 639.4 MPa，为下一代高性能轻量化车身制造提供了关键工艺窗口。Demonstrated that HFQ + PA + SB produces dense η' precipitates and discontinuous grain boundary phases, achieving 660.1 MPa UTS and 639.4 MPa YS for lightweight car body sheets.

• 采用半固态搅拌铸造结合热挤压工艺成功研制出镀镍 SiC 纳米颗粒增强 Al-Cu 基复合材料（1~3 wt.%），颗粒表面原位反应生成的 Al₃Ni 化合物大幅改善了纳米颗粒与铝熔体的润湿性并阻断了有害 Al₄C₃ 界面反应。Fabricated Ni-coated SiCp/Al–Cu nanocomposites via semisolid stir casting and hot extrusion; in-situ Al₃Ni formed on the SiCp surface enhanced wettability and prevented harmful Al₄C₃ interface reactions.
• 揭示了纳米颗粒的高效捕获与弥散机制，镀镍 SiCp 在凝固固液界面前沿被有效捕获并进入 α-Al 晶内，大幅减轻晶界偏聚，使基体 α-Al 晶粒尺寸由原始粗大枝晶 200 μm 剧烈细化至 18 μm（细化超 11 倍）。Revealed that advancing solid/liquid interfaces capture Ni-coated SiCp into the α-Al interior, suppressing grain boundary agglomeration and refining α-Al grains from 200 μm to 18 μm (>11-fold refinement).
• 系统阐明了室温（298 K）与高温（453 K、493 K）强化机制：室温强化源于纳米颗粒阻碍位错滑移、晶粒细化与热失配强化；高温强化则主要受控于晶内纳米颗粒阻碍位错攀移及对晶界的强烈钉扎。Elucidated strengthening mechanisms: room temperature strengthening is dominated by dislocation obstruction, grain refinement, and thermal mismatch; high temperature strength stems from impeded dislocation climb and grain boundary pinning.

熔体冲击成形与大规格铸锭样品展现出极佳的全等轴细晶无明显织构分布，大角晶界比例显著提高，从根本上消除了大型铸锭构件各向异性开裂隐患。Equiaxed grains show random orientation without pronounced texture; high-angle grain boundary fraction is elevated, suppressing anisotropic cracking.

高分辨 TEM 显示晶内高密度弥散析出细小盘状 η' 强化相，平均尺寸在 3~5 nm，与基体界面保持极佳半共格应变场，贡献强大位错钉扎强化。High-resolution TEM reveals dense dispersion of nanoscale plate-like η' precipitates (3-5 nm), providing robust dislocation pinning.

拉伸测试表明，通过熔体冲击细晶成型与微纳异构组织调控，挤压态抗拉强度达到近 700 MPa，轧制态延伸率突破 24%，在保证优异塑性的同时实现强度极限突破。Tensile testing verifies near 700 MPa UTS for extrusion and >24% elongation for rolling, achieving simultaneous high strength and ductility.

统计对比表明，本工作制备的 7085 高强铝合金，不仅在挤压态实现了接近 700 MPa 的超高抗拉强度（超越常规增材与锻轧上限），更在轧制态实现了突破 24% 的优异延伸率，有力破解了超高强 7000 系铝合金强度与韧性倒置的行业难题。Statistical comparison demonstrates that this work breaks the trade-off between strength and ductility, achieving both near-700 MPa UTS and >24% elongation.