Materialia最新文献_第3页

Electromagnetic wave absorbing properties of W-type hexaferrite-epoxy molding compound composites w型六铁素体-环氧成型复合材料的电磁波吸收性能

IF 3.1

Materialia Pub Date : 2026-08-01 Epub Date: 2026-07-18 DOI: 10.1016/j.mtla.2026.102845

Hyo-Ri Jung, Jinho Choi, Young-Min Kang

{"title":"Electromagnetic wave absorbing properties of W-type hexaferrite-epoxy molding compound composites","authors":"Hyo-Ri Jung, Jinho Choi, Young-Min Kang","doi":"10.1016/j.mtla.2026.102845","DOIUrl":"10.1016/j.mtla.2026.102845","url":null,"abstract":"<div><div>With the increasing deployment of highly integrated RF system-in-package (SiP) platforms, the mitigation of electromagnetic interference (EMI) generated within the package, particularly in the Sub-6 GHz band, has become an essential requirement. In this study, we precisely tuned the electromagnetic (EM) wave absorption characteristics near 6 GHz by controlling the composition of W-type hexaferrites, and evaluated the potential of these materials as EM wave absorbers suitable for SiP. BaZn<sub>2-x</sub>Co<sub>x</sub>Fe<sub>16</sub>O<sub>27</sub> (x = 0.65, 0.70, 0.75) was synthesized to elucidate the effects of Co substitution on magnetic anisotropy and ferromagnetic resonance (FMR). Subsequently, Sr-substituted compositions Ba<sub>1-y</sub>Sr<sub>y</sub>ZnCoFe<sub>16</sub>O<sub>27</sub> (y = 0.75, 0.8, 0.85, 0.90) were prepared to compare the magnetic properties, high-frequency behavior, and absorption performance associated with A-site modification. All compositions exhibited a single W-type phase, and Co and Sr substitution resulted in lattice contraction. Magnetic characterization revealed that Co and Sr substitutions progressively relaxed magnetic anisotropy, resulting in systematic shifts of FMR frequency (<em>f</em><sub>FMR</sub>). Notably, the Sr-substituted series exhibited an optimal resonance condition at x = 0.90, closely matching the target band around 6 GHz. Reflection-loss measurements confirmed that Ba<sub>1-y</sub>Sr<sub>y</sub>ZnCoFe<sub>16</sub>O<sub>27</sub> (y = 0.90) achieved the strongest absorption, with RL = −53.2 dB at 6.0 GHz, and maintained effective absorption (RL < −3 dB) even under SiP-relevant thickness constraints of ∼1.2 mm. This study demonstrates that Sr-substituted W-type hexaferrites are promising candidates for EM absorbers applicable to highly integrated RF packaging.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"48 ","pages":"Article 102845"},"PeriodicalIF":3.1,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148641299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impact of cooling rates on microstructure and magnetism in a Cu-Ni-Al-Fe alloy 冷却速率对Cu-Ni-Al-Fe合金组织和磁性的影响

IF 3.1

Materialia Pub Date : 2026-08-01 Epub Date: 2026-07-16 DOI: 10.1016/j.mtla.2026.102841

R. Goswami, T.R. Mion, A. Shabaev

{"title":"The impact of cooling rates on microstructure and magnetism in a Cu-Ni-Al-Fe alloy","authors":"R. Goswami, T.R. Mion, A. Shabaev","doi":"10.1016/j.mtla.2026.102841","DOIUrl":"10.1016/j.mtla.2026.102841","url":null,"abstract":"<div><div>Nickel-Aluminum Bronze (NAB) alloys are critical materials for naval marine components, such as propellers, where minimizing the magnetic signature is a requirement for stealth and survivability. The core scientific challenge lies in understanding the complex microstructural evolution of NAB under greater cooling conditions, and to determine how rapid thermal histories drive the precipitation, structural ordering, and spatial distribution of fine κ-phases (Fe-rich and Ni-rich), and the alloy's resulting ferromagnetic behavior. To address this, this study investigates a Cu-Al-Fe-Ni alloy subjected to four distinct cooling rates (1 °C/s, 10 °C/s, 100 °C/s, and 300 °C/s) to study varying thermal histories on microstructures and magnetic properties. Utilizing the scanning and transmission electron microscopy, and fine-probe energy-dispersive X-ray spectroscopy, we systematically characterized the size, morphology, and distribution of various κ-phases. We identify that the alloy exhibits ferromagnetism directly driven by the precipitation of Fe particles and core-shell Fe<sub>3</sub>AlNi-NiAlFe particles. Additionally, we establish the hardening of the magnetic hysteresis and concomitant increase in magnetic saturation can be attributed to a disordered Fe<sub>3</sub>(Al,Ni) magnetic phase resulting from the increased cooling rate and precipitation of higher number density of nanometer scale iron particles.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"48 ","pages":"Article 102841"},"PeriodicalIF":3.1,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148641187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A framework for the phenomenological modeling of aluminum alloys processed by laser powder-bed fusion 激光粉末床熔合成形铝合金的现象学建模框架

IF 3.1

Materialia Pub Date : 2026-08-01 Epub Date: 2026-07-21 DOI: 10.1016/j.mtla.2026.102850

Michael Mauersberger, Ashutosh Maurya, Johannes Markmiller, Subramaniam Rajan

{"title":"A framework for the phenomenological modeling of aluminum alloys processed by laser powder-bed fusion","authors":"Michael Mauersberger, Ashutosh Maurya, Johannes Markmiller, Subramaniam Rajan","doi":"10.1016/j.mtla.2026.102850","DOIUrl":"10.1016/j.mtla.2026.102850","url":null,"abstract":"<div><div>Additive manufacturing (AM) technologies, particularly laser powder-bed fusion (LPBF), are critical in producing lightweight metal components for industries like aerospace and automotive. Development of techniques that make the qualification process of AM parts more efficient and accurate are highly desirable, e.g., witness specimens incorporating complex geometries permit quality assessments early in the process. To predict the behavior of AM parts accurately requires high-fidelity material characterization laboratory tests and the use of these test data to build accurate material models. This paper shows how a framework for the phenomenological modeling of AM materials, i.e., modeling directly based on measured data from mechanical experiments without considering micromechanical effects, has been implemented in LS-DYNA’s MAT_213 material model for use with AM structural components. Present investigations focus on AM aluminum alloys Al2139 and AlSi10Mg featuring characteristics of the mechanical behavior that are challenging for simulation. To predict those characteristics, anisotropic elastoplastic properties were obtained through macro-mechanical experimental tests. Test results were fed into MAT_213 material model to predict the mechanical behavior of the material by finite element (FE) simulations. Two validation examples show how detailed tabulated input in MAT_213 can be used – results show low prediction errors for the overall specimen behavior with errors as low as 0.6% for Al2139 and 0.9% for AlSi10Mg, while stiffness values were predicted with errors less than 10%. The framework can be easily extended to create simulation models for more sophisticated geometries and other AM manufacturing techniques where there is evidence of orthotropic viscoelastic-plastic material behavior.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"48 ","pages":"Article 102850"},"PeriodicalIF":3.1,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148641188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabricating TiB2/Al-Si composites by wire arc additive manufacturing: A flux-cored wire approach 电弧增材制造制备TiB2/Al-Si复合材料：一种药芯焊丝方法

IF 3.1

Materialia Pub Date : 2026-08-01 Epub Date: 2026-07-15 DOI: 10.1016/j.mtla.2026.102838

Hao Lv, Chenggan Zhi, Jianxun Fu, Xiangping Wang, Runsheng Li, Cheng Deng, Xingwang Bai

{"title":"Fabricating TiB2/Al-Si composites by wire arc additive manufacturing: A flux-cored wire approach","authors":"Hao Lv, Chenggan Zhi, Jianxun Fu, Xiangping Wang, Runsheng Li, Cheng Deng, Xingwang Bai","doi":"10.1016/j.mtla.2026.102838","DOIUrl":"10.1016/j.mtla.2026.102838","url":null,"abstract":"<div><div>TiB<sub>2</sub> was introduced through a self-developed Al-Si alloys flux-cored wire, and TiB<sub>2</sub> reinforced Al-Si composites were successfully fabricated via wire arc additive manufacturing (WAAM). Subsequently, the comprehensive influence of TiB<sub>2</sub> particles on the formation mechanism of pores, the evolution of grain structure, and mechanical properties was studied. The results demonstrated that pores originated from hydrogen in the molten pool and the air carried by the flux-cored wire, which migrated and aggregated in the molten pool and mainly concentrated near the fusion boundary. The incorporated TiB<sub>2</sub> particles significantly modified solidification behavior, migrating to grain boundaries under the combined effects of force, where they simultaneously pinned boundaries and promoted heterogeneous nucleation. This dual effect refined grain structure and promoted equiaxed crystals throughout deposited layers. Compared with the Al-Si alloys sample, the TiB2/Al-Si composites sample strength increased to 182.44±2.15 MPa and 163.70±5.27 MPa in the horizontal and vertical directions, respectively. However, the elongation decreased to 10.21±0.59% and 4.89±0.68% in the horizontal and vertical directions, mainly due to the excessive pores. This study provides a viable WAAM strategy for fabricating Al matrix composites with controllable microstructure-property relationships.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"48 ","pages":"Article 102838"},"PeriodicalIF":3.1,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148641198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retraction notice to “Physics-Informed and Interpretable Machine Learning for Elastic Constants of RHEAs” [Materialia 45 (2026) 102682] 关于“RHEAs弹性常数的物理信息和可解释机器学习”的撤回通知[材料45 (2026)102682]

IF 3.1

Materialia Pub Date : 2026-08-01 Epub Date: 2026-08-02 DOI: 10.1016/j.mtla.2026.102857

Ravindranadh Bobbili

引用次数: 0

A size dependent crossover in common glass: Inverse Griffith behaviour enables architected strength 普通玻璃的尺寸依赖交叉：逆格里菲斯行为使建筑强度

IF 3.1

Materialia Pub Date : 2026-08-01 Epub Date: 2026-07-25 DOI: 10.1016/j.mtla.2026.102852

Mackinley Shaw, Lucas Rosson, Nick Birbilis

引用次数: 0

Hydrophobic flame-retardant polyurethane coating: With fluorinated Graphene/Fe2O3/Microencapsulated APP 疏水阻燃聚氨酯涂料：含氟石墨烯/Fe2O3/微封装APP

IF 2.9

Materialia Pub Date : 2026-06-01 Epub Date: 2026-05-20 DOI: 10.1016/j.mtla.2026.102767

Jiaqing Zhang , Lingxin He , Yi Guo , Tao Sun , Rui Liu , Yubiao Huang , Fengju Shang , Tiantian Tan , Xia Zhou

{"title":"Hydrophobic flame-retardant polyurethane coating: With fluorinated Graphene/Fe2O3/Microencapsulated APP","authors":"Jiaqing Zhang , Lingxin He , Yi Guo , Tao Sun , Rui Liu , Yubiao Huang , Fengju Shang , Tiantian Tan , Xia Zhou","doi":"10.1016/j.mtla.2026.102767","DOIUrl":"10.1016/j.mtla.2026.102767","url":null,"abstract":"<div><div>This study presents a polyurethane (PU) -based composite coating, denoted PU-FG@Fe<sub>2</sub>O<sub>3</sub>/MAPP, engineered with a hybrid filler system to achieve synergistic flame-retardant and corrosion-resistant properties. The optimized composite formulation—comprising 3 wt% fluorinated graphene (FG), 1.5 wt% γ-Fe<sub>2</sub>O<sub>3</sub>, and 10 wt% MAPP—exhibited a water contact angle of 111.1° and a 35.8% reduction in peak heat release rate (PHRR) relative to PU, the reported results are the average of three measurements. After 7 days of humid-thermal (55 °C/85% RH) and salt spray (3.5% sodium chloride) aging, although flame retardancy and hydrophobicity declined across all coatings, the PU-FG@Fe<sub>2</sub>O<sub>3</sub>/MAPP demonstrated significantly enhanced durability. Although aging led to degradation of both flame-retardant and hydrophobic performance in all coatings, the PU-FG@Fe<sub>2</sub>O<sub>3</sub>/MAPP system demonstrated significantly enhanced durability, retaining functional properties far more effectively than unmodified PU under prolonged humid-thermal and salt spray exposure. These results underscore the potential of this multifunctional coating for applications demanding robust and durable fire safety and corrosion resistance.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"47 ","pages":"Article 102767"},"PeriodicalIF":2.9,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148186047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editors for Materialia 材料编辑

IF 2.9

Materialia Pub Date : 2026-06-01 Epub Date: 2026-06-04 DOI: 10.1016/S2589-1529(26)00126-2

引用次数: 0

Strength-plasticity synergistic mechanism of Fe-30Mn-8.6Al-1C low-density steel via HDI stress regulation induced by hardness difference Fe-30Mn-8.6Al-1C低密度钢硬度差诱导HDI应力调控的强度-塑性协同机制

IF 2.9

Materialia Pub Date : 2026-05-01 Epub Date: 2026-04-24 DOI: 10.1016/j.mtla.2026.102752

Lang Bai , Lifeng Hou , Duoyao Liang , Long Yang , Haiwei Wu , Yinghui Wei

{"title":"Strength-plasticity synergistic mechanism of Fe-30Mn-8.6Al-1C low-density steel via HDI stress regulation induced by hardness difference","authors":"Lang Bai , Lifeng Hou , Duoyao Liang , Long Yang , Haiwei Wu , Yinghui Wei","doi":"10.1016/j.mtla.2026.102752","DOIUrl":"10.1016/j.mtla.2026.102752","url":null,"abstract":"<div><div>Heterogeneous deformation-induced (HDI) hardening achieves strength-ductility synergy via HDI stress, yet its key governing parameter remains unclear. Here, we produce two heterogeneous structures – partially recrystallized heterostructures (PRHs) and mixed-grain heterostructures (MGHs) – in a cold-rolled Fe–30Mn–8.6Al–1C steel by annealing. Our results reveal that the hardness difference (ΔHV) between soft and hard zones is the key parameter for tailoring the HDI stress. Large ΔHV (51 HV) in PRHs effectively hinders dislocation motion and promotes interfacial pile-ups of geometrically necessary dislocations (GNDs), generating a high HDI stress of 498.9 MPa and thus achieving a yield strength of 970 MPa and a total elongation of 32%. Conversely, minor ΔHV (14 HV) in MGHs permits concurrent dislocation transmission during pile-up, reducing GNDs storage efficiency and lowering HDI stress to 378.8 MPa. These differentiated dislocation-interface interactions are directly verified by TEM, finding offers critical insights for the design of high strength-ductility heterostructured materials.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"46 ","pages":"Article 102752"},"PeriodicalIF":2.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147802303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic effect of A-site Nd deficiency and B-site Mo doping in NdBaCo2O5+δ for enhancing electrochemical performance of solid oxide electrolysis cells NdBaCo2O5+δ中a位Nd缺乏和b位Mo掺杂对提高固体氧化物电解电池电化学性能的协同效应

IF 2.9

Materialia Pub Date : 2026-05-01 Epub Date: 2026-03-29 DOI: 10.1016/j.mtla.2026.102734

Xujie Liu , Changling Quan , Qiyue Wang , Yan Shao , Baocheng Shi , Ting Yan , Binxia Yuan , Zaiguo Fu

{"title":"Synergistic effect of A-site Nd deficiency and B-site Mo doping in NdBaCo2O5+δ for enhancing electrochemical performance of solid oxide electrolysis cells","authors":"Xujie Liu , Changling Quan , Qiyue Wang , Yan Shao , Baocheng Shi , Ting Yan , Binxia Yuan , Zaiguo Fu","doi":"10.1016/j.mtla.2026.102734","DOIUrl":"10.1016/j.mtla.2026.102734","url":null,"abstract":"<div><div>The delamination caused by thermal expansion mismatch between the anode and electrolyte in solid oxide electrolysis cells (SOECs) significantly restricts overall performance. The double perovskite materials Nd<sub>0.98</sub>BaCo<sub>2-y</sub>Mo<sub>y</sub>O<sub>5+δ</sub> (Nd<sub>0.98</sub>BCMo<sub>y</sub>, <em>y</em> = 0.03–0.07) were synthesized as oxygen electrodes of SOECs. Synergistic modification of A-site Nd deficiency and B-site Mo doping was adopted to improve the thermal expansion coefficient (TEC) and electrical conductivity of the NdBaCo<sub>2</sub>O<sub>5+δ</sub> (NBC). Specifically, Nd<sub>0.98</sub>BaCo<sub>1.93</sub>Mo<sub>0.07</sub>O<sub>5+δ</sub> exhibited a TEC of 13.94 × 10<sup>–6</sup> K<sup>-1</sup> and electrical conductivity of 235 S·cm<sup>-1</sup> at 800 °C, which were markedly superior to NBC. Thermogravimetric analysis further confirmed that the modified samples exhibited excellent thermal stability. In terms of electrochemical performance, the symmetric cell with Nd<sub>0.98</sub>BCMo<sub>0.03</sub> exhibited a polarization resistance of 0.027 Ω·cm<sup>2</sup> at 800 °C. A single cell utilizing this material as the oxygen electrode delivered a current density of 875.48 mA·cm<sup>-2</sup> at 800 °C under 1.5 V, corresponding to a theoretical hydrogen production rate of 365.95 ml·cm<sup>-2</sup>·h<sup>-1</sup>. These attractive properties demonstrate that the synergistic modification through A-site deficiency and B-site doping can effectively enhance NBC, offering a new strategy for developing oxygen electrode materials for solid oxide electrolysis cells.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"46 ","pages":"Article 102734"},"PeriodicalIF":2.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147802304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0