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A novel folded cup energy absorption structure: Design and validation 一种新型折叠杯吸能结构:设计与验证
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-23 DOI: 10.1016/j.mtla.2025.102646
Qiqi Li , Fanjiao He , Congrui Xie , Kai Liu , Hui Gao , Ping Zou , Lin Hu
In this study, inspired by the design of a step-folding cup, a similar structure, the novel folded cup energy absorption structure (FES), was proposed. This structure is fabricated using selective laser sintering (SLS) technology with nylon 11. Through rigorous simulation analysis, the energy absorption characteristics of the FES have been systematically elucidated. Subsequently, the deformation behavior and mechanical properties under axial compression were investigated using finite element analysis (FEA) and practical experimentation. FES achieves unique mechanical characteristics, including negative stiffness and a novel deformation mode. To validate the effectiveness of the proposed structure, a comparative analysis was conducted between experimental and simulation results. This paper analyzes the compressive mechanical properties of the FES from four perspectives: the diameter of each layer, the thickness of the inclined buffer layer, the number of layers, and the proportion of the inclined buffer layer at the end. The findings demonstrate that a decrease in diameter deviation, in essence, is positively correlated with both the dimensional ratio and the thickness of the inclined buffer layer, leading to significantly improved energy absorption capabilities in the FES model. Compared to the experimental benchmark model, the parametric model demonstrates up to 112.58% enhancement in specific energy absorption.
在本研究中,受阶梯折叠杯设计的启发,提出了一种类似结构的新型折叠杯能量吸收结构。该结构是用选择性激光烧结(SLS)技术与尼龙11制造的。通过严格的仿真分析,系统地阐明了FES的能量吸收特性。随后,采用有限元分析和实际试验相结合的方法研究了轴压作用下的变形行为和力学性能。FES具有独特的力学特性,包括负刚度和新颖的变形模式。为了验证该结构的有效性,对实验结果和仿真结果进行了对比分析。本文从每层直径、倾斜缓冲层厚度、层数和末端倾斜缓冲层比例四个角度分析了FES的压缩力学性能。研究结果表明,直径偏差的减小实质上与倾斜缓冲层的尺寸比和厚度呈正相关,从而显著提高了FES模型的能量吸收能力。与实验基准模型相比,参数化模型的比能吸收提高了112.58%。
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引用次数: 0
Porcine acellular dermal matrix facilitates hair follicle stem cells entering the hair cycle in C57/BL6 mice 猪脱细胞真皮基质促进毛囊干细胞进入C57/BL6小鼠毛发周期
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.mtla.2026.102669
Dar-Jen Hsieh , Srinivasan Periasamy , Ko-Chung Yen , Dur-Zong Hsu , Su-Shin Lee
Alopecia is a skin disease characterized by hair loss, which mainly distresses mental health and quality of life. A rise in the number of alopecia cases is evolving due to a variety of factors. We developed a porcine collagen acellular dermal matrix (ADM) using supercritical carbon dioxide (SCCO2) extraction technology. We then cryo-ground the ADM into particles, ranging from 50–150 μm, named ADM scaffolds. In the present study, we used C57BL/6 mice injected with ADM scaffold and evaluated hair growth with and without mice Platelet-Rich Plasma (PRP), to evaluate its efficacy in hair regeneration. The combination of the ADM scaffold and mice PRP exhibited a synergistic effect. Hair growth was observed in ADM scaffold-treated mice in a time-dependent manner. Subdermal injection of the ADM scaffold enabled a serial cascade of stem cell differentiation markers for hair regeneration. ADM scaffold injected in the subdermal layer of the skin was found to modulate the CD34-positive stem cells and then followed by the expression of the hair cycle differentiation-related markers Sox9, Wnt3a, β-catenin, Ki67, and Lef-1, thereby modulating the hair cycle and increasing the hair follicles. To conclude, SCCO2-derived porcine ADM scaffold increased hair follicles and hair density and might be a therapeutic solution for alopecia, without any adverse effects.
脱发是一种以脱发为特征的皮肤病,主要影响心理健康和生活质量。由于各种因素,脱发病例的数量正在不断增加。采用超临界二氧化碳(SCCO2)萃取技术制备猪胶原脱细胞真皮基质(ADM)。然后我们将ADM冷冻研磨成50-150 μm的颗粒,命名为ADM支架。本研究以C57BL/6小鼠为实验对象,注射ADM支架,观察其在添加和不添加富血小板血浆(PRP)的情况下毛发生长情况,以评价其对毛发再生的作用。ADM支架与小鼠PRP联合使用具有协同作用。ADM支架处理小鼠毛发生长呈时间依赖性。皮下注射ADM支架使一系列的干细胞分化标记物级联用于毛发再生。皮下注射ADM支架可调节cd34阳性干细胞,随后调节毛发周期分化相关标志物Sox9、Wnt3a、β-catenin、Ki67、Lef-1的表达,从而调节毛发周期,增加毛囊数量。综上所述,scco2衍生的猪ADM支架增加了毛囊和毛发密度,可能是一种治疗脱发的解决方案,没有任何不良反应。
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引用次数: 0
Deformation mechanisms of dual-phase high entropy alloy with 9R structures at ambient and cryogenic temperatures 常温和低温下9R组织双相高熵合金的变形机理
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2026-01-14 DOI: 10.1016/j.mtla.2026.102663
Min Peng , Zhixue Cheng , Yeqing Cai , Yongjiang Jiang , Jingjing Zhao , Xi Zhu , Lixia Wang
The role of 9R structures in mediating phase transformations and mechanical properties of high-entropy alloys (HEAs) remains inadequately understood. This study investigates the tensile behavior of an Fe40Mn35Co20Cr5 HEA containing pre-existing 9R structures at both room temperature and 77 K. Results confirm the operation of a transformation-induced plasticity (TRIP) effect under both conditions. It is noteworthy that the low-temperature environment not only enables the stable existence of 9R structures but also promotes a massive phase transformation into a hexagonal close-packed (HCP) structure, consequently leading to the formation of a rarely reported HCP network structure at cryogenic temperatures. The synergistic interaction among the 9R structures, stacking faults, dislocations, and the HCP network enables the alloy to achieve significantly enhanced strength at 77 K without compromising ductility. A key finding is the crystallographic alignment between the 9R and the newly formed HCP structures, providing direct evidence for the role of 9R as a potent TRIP enhancer. Supported by a proposed crystallographic model for the 9R→HCP transformation, this work offers critical insights for designing advanced cryogenic structural materials leveraging 9R-phase engineering.
9R结构在高熵合金(HEAs)相变和力学性能中的调节作用尚不清楚。本文研究了含有9R结构的Fe40Mn35Co20Cr5 HEA在室温和77 K下的拉伸行为。结果证实,在这两种条件下,相变诱发塑性(TRIP)效应都在起作用。值得注意的是,低温环境不仅使9R结构稳定存在,而且促进了大量的相变向六边形紧密堆积(HCP)结构转变,从而导致在低温下形成罕见的HCP网络结构。9R组织、层错、位错和HCP网络之间的协同作用使合金在77 K时的强度显著提高,而塑性不受影响。一个关键的发现是9R和新形成的HCP结构之间的晶体排列,为9R作为一种有效的TRIP增强剂的作用提供了直接证据。在提出的9R→HCP相变晶体学模型的支持下,这项工作为利用9R相工程设计先进的低温结构材料提供了重要的见解。
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引用次数: 0
Unlocking the synergy: How tip-radius and crystal orientation govern indentation in ferrous FCC alloys 解锁协同作用:尖端半径和晶体取向如何控制铁FCC合金中的压痕
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-01 DOI: 10.1016/j.mtla.2025.102621
Arka Mandal , Sankalp Biswal , Shiv Brat Singh, Debalay Chakrabarti
The present study investigates the synergistic effects of indenter tip-radius and crystallographic orientation on the nanoindentation response of a ferrous FCC alloy, i.e. 304 austenitic stainless steel, combining experimental nanoindentation and molecular dynamics (MD) simulations. Although considerable research attention has been paid to the individual effects of crystal orientation and tip-radius, their combined influence on the indentation response of these alloys is still not well explored. This investigation concentrates on grains having different crystallographic orientations for various indenter geometries (tip-radii), which is of primary importance to relate mechanical response with microstructural features as well as identify where such differences in micro-mechanics originate. Grain 1, i.e., (111), having poor slip plane alignment, is the stiffest, while Grain 2, i.e., (100) with favorable slip plane orientations, is found to pose the least resistance to deformation. MD simulations provide insight into the details of occurring dislocation dynamics, such as Shockley partials, Stair-rod, and Hirth dislocations, with respect to their role in accommodating strains and the load-dip phenomenon. Distinct deformation mechanisms between sharp Berkovich (by the formation of prismatic dislocation loop) and spherical (by the formation of perfect stacking fault tetrahedron) indenters emphasize the influence of tip geometry on the development of dislocation substructure. This study bridges the gap between the fundamental mechanics of deformation and the application-oriented design of materials for developing these alloys with enhanced strength, reliability, and resistance to complex modes of loading.
结合实验纳米压痕和分子动力学模拟,研究了压痕尖端半径和晶体取向对304奥氏体不锈钢的纳米压痕响应的协同效应。虽然晶体取向和尖端半径的单独影响已经引起了相当多的研究,但它们对这些合金的压痕响应的综合影响尚未得到很好的探讨。本研究集中在不同压头几何形状(尖端半径)具有不同晶体取向的晶粒上,这对于将力学响应与微观结构特征联系起来以及确定微观力学差异的来源至关重要。滑移面取向较差的晶粒1(111)是最硬的,而滑移面取向良好的晶粒2(100)对变形的阻力最小。MD模拟提供了对发生的位错动力学细节的深入了解,例如肖克利偏位、阶梯位错和Hirth位错,以及它们在适应应变和负载倾斜现象中的作用。尖锐的Berkovich压头(通过形成棱柱形位错环)和球形压头(通过形成完美的层错四面体)之间不同的变形机制强调了尖端几何形状对位错子结构发展的影响。这项研究弥合了变形的基本力学和面向材料的应用设计之间的差距,以开发这些具有增强强度,可靠性和抵抗复杂加载模式的合金。
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引用次数: 0
Combinatorial investigation of microstructural evolution and multifunctional properties in Cu/Ti nanolaminates Cu/Ti纳米层合材料微观结构演变及多功能性能的组合研究
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2026-02-12 DOI: 10.1016/j.mtla.2026.102690
Rohit Berlia , Marshall Civin , Yucheng Sun , Rayna T. Mehta , Timothy P. Weihs
Metallic nanolaminates possess exceptionally high specific strength and thermal/radiation stability, governed by the presence of interfaces, that are attractive for microelectronics, protective coatings, and aerospace/energy components. Understanding their temperature-dependent, structure–property evolution is therefore essential. Here, we couple high-throughput combinatorial synthesis with rapid property screening to map structure–property relationships in Cu/Ti nanolaminate foils. Free-standing ∼200 µm thick nanolaminates with systematically varied Ti contents (0.8–6.5 at %) were fabricated by magnetron sputtering and subjected to differential scanning calorimetry (DSC), nanoindentation, and four-point probe resistivity measurements. DSC revealed exothermic events arising from interfacial reactions resulting in the sequential formation of metastable and stable Cu₄Ti intermetallic phases. All Cu/Ti nanolaminates exhibit composition- and temperature-dependent property evolution. Hardness increases upon heating to ∼350 °C, then decreases at higher temperatures due to grain coarsening and the loss of the layered architecture. Similarly, electrical conductivity also exhibits a strong temperature- and composition-dependence, reflecting the evolution of scattering sites at interfaces. It initially decreases with increasing temperature due to the scattering from a less conductive intermetallic phase, then rises at higher temperatures as layers break down and scattering decreases. Together, these results establish direct links between interfacial reactions, microstructural evolution, and multifunctional property changes. The high-throughput combinatorial approach demonstrates an efficient pathway to map phase–property relationships in metallic nanolaminates and provides design insights for tailoring mechanical and functional performance in Cu/Ti based nanolaminate system.
金属纳米层合材料具有特别高的比强度和热/辐射稳定性,受界面存在的控制,对微电子、保护涂层和航空航天/能源组件具有吸引力。因此,了解它们的温度依赖性、结构性质演化是必不可少的。在这里,我们将高通量组合合成与快速性能筛选相结合,以绘制Cu/Ti纳米层膜的结构-性能关系。通过磁控溅射制备了独立的~ 200 μ m厚的纳米层合材料,其Ti含量系统地变化(0.8-6.5 at %),并进行了差示扫描量热法(DSC)、纳米压痕和四点探针电阻率测量。DSC揭示了由界面反应引起的放热事件,导致亚稳和稳定的Cu₄Ti金属间相的顺序形成。所有Cu/Ti纳米层合材料都表现出成分和温度依赖的性质演变。硬度在加热到~ 350°C时增加,然后在更高温度下由于晶粒粗化和层状结构的损失而降低。同样,电导率也表现出强烈的温度和成分依赖性,反映了界面上散射位点的演变。它最初随着温度的升高而降低,这是由于导电率较低的金属间相的散射,然后随着层的分解和散射的减少而在较高的温度下上升。总之,这些结果建立了界面反应,微观结构演变和多功能性质变化之间的直接联系。高通量组合方法展示了一种有效的途径来绘制金属纳米层合材料的相性质关系,并为定制Cu/Ti基纳米层合材料系统的机械和功能性能提供了设计见解。
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引用次数: 0
GCSA-CDDPM: A novel method for multi-source grain boundary conditional generation in selective laser melting GCSA-CDDPM:一种选择性激光熔化中多源晶界条件生成的新方法
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2026-01-13 DOI: 10.1016/j.mtla.2026.102662
Anyong Lu , Xiaoxun Zhang , Fang Ma , Shupeng Guo , Yuangyou Huang
The generation of grain boundary images for metallic materials in additive manufacturing (AM) remains underdeveloped, largely hindered by challenges in multi-source data fusion, grain boundary discontinuity, and inadequate modelling of process–structure relationships. To address these issues, this study proposes a conditional diffusion model (GCSA-CDDPM) enhanced by a global channel–spatial attention mechanism, validated on SLM-processed 316 L stainless steel. The proposed approach comprises three core strategies: (1) designing a unified pipeline for processing heterogeneous grain boundary images, enabling the construction of a high-quality, multi-scale, cross-literature dataset; (2) Putting forward the GCSA module with the process parameter embedding structure to enhance the image structure modelling and generation modulation capability; and (3) introducing a hierarchical breakpoint repair strategy to enhance boundary continuity. Experimental results demonstrate that GCSA-CDDPM surpasses baseline models in structural fidelity, scale conformity, and parameter responsiveness. It achieves the best performance in FID (33.04), grain size error (7.07%), and matching accuracy (92.93%), while producing visually superior images in terms of boundary integrity, noise suppression, and pattern stability. In addition, our findings confirm the model’s ability to capture implicit mappings across process parameters, microstructural morphology, and grain size evolution. The framework enables high-fidelity grain boundary generation with explicit process-structure mapping, providing a digital tool for accelerating alloy design and quality control in SLM-based manufacturing.
增材制造(AM)中金属材料晶界图像的生成仍然不发达,主要受到多源数据融合、晶界不连续以及过程结构关系建模不足等挑战的阻碍。为了解决这些问题,本研究提出了一个由全局通道-空间注意机制增强的条件扩散模型(GCSA-CDDPM),并在slm加工的316l不锈钢上进行了验证。该方法包括三个核心策略:(1)设计一个统一的管道来处理异构晶界图像,从而构建高质量、多尺度、跨文献的数据集;(2)提出了具有过程参数嵌入结构的GCSA模块,增强了图像结构建模和生成调制能力;(3)引入分层断点修复策略,增强边界连续性。实验结果表明,GCSA-CDDPM模型在结构保真度、尺度一致性和参数响应性方面均优于基线模型。该方法在FID(33.04)、粒度误差(7.07%)和匹配精度(92.93%)方面均取得了最佳性能,同时在边界完整性、噪声抑制和图案稳定性方面产生了视觉上优越的图像。此外,我们的研究结果证实了该模型能够捕获跨工艺参数、微观结构形态和晶粒尺寸演变的隐式映射。该框架通过明确的工艺结构映射实现高保真的晶界生成,为基于slm的制造中加速合金设计和质量控制提供了数字工具。
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引用次数: 0
Defects in MBE grown type-II superlattice multilayers for infrared detectors 红外探测器用MBE生长ii型超晶格多层膜的缺陷
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-15 DOI: 10.1016/j.mtla.2025.102639
R. Goswami , S.B. Qadri
The density and distribution of defects play a crucial role in controlling the performance of the infrared detector. Here we employ high resolution x-ray diffraction topography and high-resolution transmission electron microscopy to investigate the defects structure of the molecular beam epitaxy grown multilayer films, consisting of a two-layer period of InGaSb/InAs, and then a four-layer period of AlGaInSb/InAs/GaInSb/InAs on GaSb (001) substrate. The high-resolution transmission electron microscopy shows the epitaxial growth, with layer defects and dislocations in both types of superlattices. The multilayer spacings were measured using the superlattice peaks of the x-ray diffraction patterns, as the spacing between these satellite peaks is directly related to the superlattice period. The spacing turns out to be 7.2 nm and 10.4 nm for two and four periods, respectively, consistent with the transmission electron microscopy measurements. The strain between multilayers has been estimated by analyzing the symmetric and asymmetric reflections. The estimated strain is 0.04%, suggesting the superior growth of the superlattice layers. The dislocation density in the two-period and four-period layers, estimated from the HRTEM images, is ≈ 1.7×1016 m−2, which is considerably high and consistent with the estimated dislocation density obtained from the XRD peak broadening. Such high density of defects, originated during the multilayer growth due to differential thermal mismatch between layers, can affect the film quality and increase the dark noise of the detector.
缺陷的密度和分布对红外探测器的性能起着至关重要的控制作用。本文采用高分辨率x射线衍射形貌和高分辨率透射电镜研究了在GaSb(001)衬底上生长的由两层InGaSb/InAs和四层AlGaInSb/InAs/GaInSb/InAs组成的分子束外延多层薄膜的缺陷结构。高分辨率透射电镜显示外延生长,在两种类型的超晶格中都有层缺陷和位错。利用x射线衍射图的超晶格峰测量多层间距,因为这些卫星峰之间的间距与超晶格周期直接相关。两个和四个周期的间距分别为7.2 nm和10.4 nm,与透射电镜测量结果一致。通过对对称反射和非对称反射的分析,估计了多层间的应变。估计应变为0.04%,表明超晶格层生长良好。HRTEM图像估计的二周期和四周期层的位错密度为≈1.7×1016 m−2,这与XRD峰展宽估计的位错密度一致。这种高密度的缺陷是在多层生长过程中由于层与层之间的热差失配而产生的,会影响薄膜质量并增加探测器的暗噪声。
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引用次数: 0
Optimisation of TiH2–Nb alloy for bone implant using Box–Behnken design: Enhancing strength, elastic modulus and dehydrogenation behaviour through powder metallurgy Box-Behnken设计优化TiH2-Nb合金骨种植体:通过粉末冶金提高强度、弹性模量和脱氢行为
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.mtla.2025.102640
Anis Fatehah Sa’aidi , Hussain Zuhailawati , Ahmad Farrahnoor
Traditional Ti–6Al–4V implants pose challenges due to their high stiffness and potential toxicity, prompting the development of β-type titanium (Ti) alloys with non-toxic alloying elements like niobium (Nb). Titanium hydride (TiH₂) was selected as a precursor due to its improved sinterability, oxidation resistance, and affordability. The TiH₂–Nb alloy was produced through mechanical alloying and powder metallurgy, with optimisation using the Box-Behnken Design (BBD) method. Elemental TiH₂ (60 wt%) and Nb (40 wt%) powders were milled at various speeds (100 to 300 rpm), compacted at 500 MPa, and sintered under an argon atmosphere at temperatures between 800 °C and 1200 °C for 1 to 3 h. Response surface methodology (RSM) identified sintering temperature as the most influential factor on compressive strength and elastic modulus. Optimal conditions, milling at 200 rpm and sintering at 1200 °C for 3 h, yielded in a compressive strength of 1768 MPa and an elastic modulus of 8.7 GPa, closely matching human cortical bone properties. TiH₂–Nb alloy outperformed Ti–Nb alloy in terms of densification (98.56 % relative density), reduced porosity (1.44 %), and desirability score (0.9). Thermogravimetric (TG) analysis confirmed effective dehydrogenation at higher milling speeds due to enhanced Nb diffusion and defect density. X-ray diffraction (XRD) confirmed formation of a dual-phase α+β Ti structure. Optimised TiH₂–Nb alloys offer a promising alternative to Ti–6Al–4V implants, with reduced stress shielding and improved mechanical compatibility for future orthopaedic implants.
传统的Ti - 6al - 4v植入物由于其高刚度和潜在的毒性而面临挑战,促使了β型钛(Ti)合金的发展,其中包括铌(Nb)等无毒合金元素。选择氢化钛(TiH₂)作为前驱体是因为它具有更好的烧结性、抗氧化性和可负担性。通过机械合金化和粉末冶金制备TiH₂-Nb合金,并使用Box-Behnken设计(BBD)方法进行优化。元素TiH 2 (60 wt%)和Nb (40 wt%)粉末以不同的速度(100至300 rpm)研磨,在500 MPa下压实,并在800°C至1200°C的氩气气氛下烧结1至3小时。响应面法(RSM)确定烧结温度是影响抗压强度和弹性模量的最重要因素。在最佳条件下,铣削速度为200转/分,烧结温度为1200℃,烧结时间为3小时,得到的抗压强度为1768 MPa,弹性模量为8.7 GPa,与人类皮质骨的性能非常接近。TiH₂-Nb合金的致密性(相对密度为98.56%)、降低孔隙率(1.44%)和可取性分数(0.9)均优于Ti-Nb合金。热重(TG)分析证实,在较高的铣削速度下,由于Nb扩散和缺陷密度的增强,有效脱氢。x射线衍射(XRD)证实了双相α+β Ti结构的形成。优化的TiH₂-Nb合金为Ti-6Al-4V植入物提供了一种有希望的替代方案,减少了应力屏蔽,提高了未来骨科植入物的机械兼容性。
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引用次数: 0
The decomposing crystallography of sandwich-like microstructure from deformed martensite in Ti-10V-2Fe-3Al alloy Ti-10V-2Fe-3Al合金中变形马氏体三明治状组织的分解结晶学
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2026-01-15 DOI: 10.1016/j.mtla.2026.102666
Tong Wang , Xinfu Gu , Ping Yang , Mengqi Yan , Fuzhi Dai
Crystal defects are critical in the microstructure control of titanium alloys, as they determine the precipitation characteristics of α phase. In this study, the decomposition of stress-induced martensite in Ti-10V-2Fe-3Al is investigated to understand the effect of martensite on α precipitation. The crystallography between α and β phases is analyzed using Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM). During decomposition, the martensite is first transformed into α, and then to βT, with a misorientation of 50°/<110> with matrix βM. During further aging, α begins to precipitate at the βMT boundaries, and α phase exhibits two types of orientation relationships with β phase, i.e. Type I: one involving a double Burgers orientation relationship (BOR) and Type II: the other involving a single-sided BOR with βT while the other side follows (1¯10)βM(1¯21¯3)α[1¯1¯1]βM[1¯010]α with βM. As for Type I, the selection of single α variant is due to the constraint of the β grains, <11¯1>βT and <11¯1¯>βM are parallel to [1¯21¯0]α and [1120]α respectively and its habit plane {334} is close to βMT boundary. In Type II, the selected α variant, which has a {334} habit plane, also lies close to the βMT boundary. This finding indicates that the variant selection rule of the habit plane governs α precipitation during martensite decomposition.
晶体缺陷决定了钛合金α相的析出特性,是钛合金微观组织控制的关键。本研究研究了应力诱导马氏体在Ti-10V-2Fe-3Al中的分解,以了解马氏体对α析出的影响。利用电子背散射衍射(EBSD)和透射电镜(TEM)分析了α和β相之间的晶体学。在分解过程中,马氏体首先转变为α,然后转变为βT,与基体βM的取向偏差为50°/<;110>;在进一步时效过程中,α在β m -βT晶界处开始析出,α相与β相表现出两种取向关系,即ⅰ型为双Burgers取向关系(BOR),ⅱ型为单侧BOR与β t取向关系,另一侧为(1¯10)β m ~(1¯21¯3)α[1¯1¯1]β m ~[1¯010]α与β m取向关系。对于I型,单个α变体的选择是由于β晶粒的约束,<11¯1>;β t和<;11¯1¯>;β m分别平行于[1¯21¯0]α和[11¯20]α,其习惯面{334}靠近β m -βT边界。在II型中,选择的α变异体也位于βM-βT边界附近,具有{334}习惯面。这一发现表明马氏体分解过程中习惯面的变异选择规律支配着α的析出。
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引用次数: 0
Orientation-dependent wetting behavior of molten Al on α-Al2O3 in high magnetic fields 高磁场下Al熔液对α-Al2O3的取向依赖性润湿行为
IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.mtla.2025.102631
Peng Miao , Tie Liu , Shuoxi Yang , Zhengyang Lu , Weibin Cui , Shuang Yuan , Chao Li , Qiang Wang
High magnetic fields (HMFs) can markedly influence wetting behavior by modifying the solid–liquid interfacial structure. However, their effects on the wettability of systems with different interfacial structures remain unexplored. We investigated the wetting behavior of molten Al on α-Al2O3 with different orientations under HMFs and elucidated the underlying wetting mechanism. The Al/R-plane α-Al2O3 system showed the best wettability, with the contact angle reduced by 49° at 6 T. Structural analyses revealed that HMFs induce ordered Al layers epitaxially grown on the substrate (up to ∼13 layers on the R-plane), driving the interface toward near-coherency and reducing the solid–liquid interfacial energy, thereby significantly enhancing wettability. In addition, orientation-dependent differences in substrate surface structures produce distinct interfacial structures with molten Al, resulting in different wettability. These results highlight a new strategy for tailoring wettability and interfacial properties via magnetic field-substrate orientation coupling.
强磁场可以通过改变固液界面结构显著影响润湿行为。然而,它们对具有不同界面结构的体系的润湿性的影响仍未被探索。研究了熔融Al在HMFs作用下对不同取向α-Al2O3的润湿行为,并阐明了其润湿机理。Al/ r面α-Al2O3体系表现出最好的润湿性,在6 t时接触角减小了49°,结构分析表明,HMFs诱导有序的Al层外延生长在衬底上(r面多达13层),推动界面向近相干方向发展,降低了固液界面能,从而显著提高了润湿性。此外,取向相关的衬底表面结构差异与熔融Al产生不同的界面结构,从而导致不同的润湿性。这些结果强调了通过磁场-衬底取向耦合来调整润湿性和界面性能的新策略。
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Materialia
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