IF 3

Materialia Pub Date : 2025-06-18 DOI: 10.1016/j.mtla.2025.102466

Zhangjing Shi , Keqian Gong , Zifeng Song , Zheng Liu , Chao Zhou , Yangyang Cai , Yanfei Sun , Cheng Ren , Yong Zhang

{"title":"Effect of precompression on the thermal cycling stability of glass-to-metal seals","authors":"Zhangjing Shi , Keqian Gong , Zifeng Song , Zheng Liu , Chao Zhou , Yangyang Cai , Yanfei Sun , Cheng Ren , Yong Zhang","doi":"10.1016/j.mtla.2025.102466","DOIUrl":"10.1016/j.mtla.2025.102466","url":null,"abstract":"<div><div>Hermeticity is a critical performance attribute of glass-to-metal (GTM) compressive seals, whose long-term reliability is often compromised by crack initiation and propagation. These failures primarily originate from the nonuniform stress distribution on the GTM seal surface and the inherent material properties, such as the weak mechanical strength, both of which exacerbate structural vulnerabilities over prolonged service periods. In this study, precompression was introduced during the heat treatment stage as a means to increase the thermal cycling stability of GTM seals. The results indicated a proportional relationship between the precompression stress and the thermal cycling stability of GTM seals. Porosity analysis was conducted on three different samples, which demonstrated that precompression improved the distribution of bubbles within the GTM seals, as evidenced by a reduction in the porosity and a decrease in the bubble size. In addition, the mechanical properties of the sealing glass were enhanced, thereby reducing the probability of leakage. Furthermore, nanoindentation measurements and finite element analysis of the surface stress distribution revealed that precompression led to an increase in residual compressive stress. The alleviation of stress concentration regions significantly lowered the probability of crack initiation during thermal cycling, thus establishing a more uniform stress distribution and enhancing the thermal stability of GTM seals.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102466"},"PeriodicalIF":3.0,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331297","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

Slip vs. Twin martensite in additively manufactured Ti-6Al-4V: A grain boundary perspective 增材制造Ti-6Al-4V中的滑移与双马氏体：晶界视角

IF 3

Materialia Pub Date : 2025-06-13 DOI: 10.1016/j.mtla.2025.102463

Vikrant Saumitra , Avinash Gonnabattula , V. Anil Kumar , Anand K Kanjarla

{"title":"Slip vs. Twin martensite in additively manufactured Ti-6Al-4V: A grain boundary perspective","authors":"Vikrant Saumitra , Avinash Gonnabattula , V. Anil Kumar , Anand K Kanjarla","doi":"10.1016/j.mtla.2025.102463","DOIUrl":"10.1016/j.mtla.2025.102463","url":null,"abstract":"<div><div>There is an ongoing debate regarding whether martensitic transformation in Ti alloys is governed by slip or twin-based mechanisms. The mechanism that predominates depends on lattice parameter changes caused by composition. For instance, CP-Ti typically under- goes slip-based transformation, while Ti-6Al-4V tends to favor twin-based transformation. However, processing conditions, particularly in additive manufacturing (AM), can introduce lattice strains and alter lattice parameters, resulting in distinct martensitic transformation mechanisms. Both mechanisms influence the variant selection and the formation of character- istic variant cluster morphologies, such as triangular (slip-based) and V-shaped (twin-based), which in turn dictate the selection of intervariant boundaries (IBs). This study explores the characteristics and network of IBs in Ti-6Al-4V for two distinct AM processes: Laser-Powder Bed Fusion (L-PBF) and Wire Laser-Direct Energy Deposition (L-DED). The sympathetic approach to variant selection is extended to the selection of IB and twin boundaries. Key features of the IB network, including triple points and dihedral angles, are examined to pro- vide a deeper understanding of the stability, configuration, and correlation of grain boundary networks with variant selection mechanisms. It is observed that V-shaped clusters dominate in L-DED, while triangular clusters are more common in L-PBF. Furthermore, L-DED ex- hibits a higher fraction of Σ13<em>b</em> twin boundaries than L-PBF samples. These findings suggest that martensitic transformation in L-DED is primarily twin-based, whereas in L-PBF, it is more likely to be slip-based. The sympathetic approach provides valuable insights into the martensitic transformation mechanisms in Ti alloys.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102463"},"PeriodicalIF":3.0,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297865","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

Compression properties, in vitro degradation behavior and biocompatibility of porous Mg-1Zn-1Ca-0.5Mn scaffolds with different pore structures 不同孔结构Mg-1Zn-1Ca-0.5Mn多孔支架的压缩性能、体外降解行为及生物相容性

IF 3

Materialia Pub Date : 2025-06-11 DOI: 10.1016/j.mtla.2025.102460

Zhe Li , Leiting Yu , Shi Qiu , Baoli Zhou , Shaoyuan Lyu , Wei Li , Minfang Chen

{"title":"Compression properties, in vitro degradation behavior and biocompatibility of porous Mg-1Zn-1Ca-0.5Mn scaffolds with different pore structures","authors":"Zhe Li , Leiting Yu , Shi Qiu , Baoli Zhou , Shaoyuan Lyu , Wei Li , Minfang Chen","doi":"10.1016/j.mtla.2025.102460","DOIUrl":"10.1016/j.mtla.2025.102460","url":null,"abstract":"<div><div>The pore shape and connectivity of porous Mg alloy scaffolds are of crucial significance for their mechanical properties, degradability, and biocompatibility. In this study, porous Mg-1Zn-1Ca-0.5Mn scaffolds with different pore structures were designed and manufactured using negative salt templates and infiltration casting to compare their properties. The results show that in terms of mechanical properties, the yield strength of the porous spherical scaffold, reaching 13.5 MPa, is higher than that of the porous cubic scaffold (4.9 MPa). Regarding degradability, the corrosion rate of the spherical scaffold (0.69±0.09 mm/year) is lower than cubic scaffold (1.09±0.12 mm/year), For biocompatibility, the pore structure of the porous spherical scaffold shows better cell adhesion compared to the cubic scaffold. The better mechanical property of the spherical scaffold can be attributed to the unique connectivity of its spherical pore structure, which enables more efficient stress dispersion, thus strengthening the overall mechanical strength. The better corrosion resistance is because the spherical scaffold has the more uniform pores and less contact area with the HBSS. As for biocompatibility, the uniform curvature of the spherical pore edges minimizes stress concentration, creating a stable mechanical environment for cells. The spherical shape closely aligns with the natural morphology of cells, which may promote cell spread and migration. Also, the continuous edges and absence of sharp corners in spherical pores reduce the mechanical stress during cell adhesion and have certain effects on enhancing cell adhesion and proliferation.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102460"},"PeriodicalIF":3.0,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270872","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

Quantitative analysis of hydrogen absorption in pure aluminum: Theoretical and experimental approaches 纯铝中氢吸收的定量分析：理论和实验方法

IF 3

Materialia Pub Date : 2025-06-10 DOI: 10.1016/j.mtla.2025.102449

Akio Ishii, Keitaro Horikawa

{"title":"Quantitative analysis of hydrogen absorption in pure aluminum: Theoretical and experimental approaches","authors":"Akio Ishii, Keitaro Horikawa","doi":"10.1016/j.mtla.2025.102449","DOIUrl":"10.1016/j.mtla.2025.102449","url":null,"abstract":"<div><div>In this study, we quantitatively investigated the hydrogen absorption in pure Al under surface exposure to high-pressure hydrogen gas or water from both theoretical and experimental perspectives. From a theoretical perspective, we implemented a non-empirical multiscale analysis of the temporal evolution of hydrogen concentration in face-centered cubic Al under exposure of the <span><math><mrow><mo>(</mo><mn>111</mn><mo>)</mo></mrow></math></span> surface to high-pressure hydrogen gas or water using density functional theory and a recently proposed simple kinetic model. From an experimental perspective, we developed a method to introduce hydrogen onto the Al surface without an oxide layer in the presence of water by utilizing surface friction in water (FW). After the FW process, the amount of hydrogen absorbed was measured via thermal desorption analysis. The theoretical and experimental results agreed well, and the estimated hydrogen concentration in the bulk under water conditions was approximately 100 mass ppb, although we theoretically confirmed that the absorption of hydrogen in bulk Al under high-pressure hydrogen gas conditions (70 MPa) was negligible; the concentration in the bulk was only <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup></mrow></math></span> mass ppb. We also performed a tensile test on a hydrogen-charged pure Al sample to investigate the effect of hydrogen on the tensile properties and confirmed that 100 mass ppb order hydrogen charging in Al significantly reduces the tensile strength of Al.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102449"},"PeriodicalIF":3.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307786","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

Application of 3D printed calcium phosphate cement scaffolds in open wedge high tibial osteotomy (owHTO) – A retrospective clinical evaluation 3D打印磷酸钙水泥支架在开楔高位胫骨截骨术中的应用——回顾性临床评价

IF 3

Materialia Pub Date : 2025-06-07 DOI: 10.1016/j.mtla.2025.102459

Richard Frank Richter , Frank Pries , Volker Alt , Anja Lode , Sascha Heinemann

引用次数: 0

Effect of pre-deformation and subsolvus heat treatment on microstructure and mechanical properties of a PM nickel superalloy 预变形和亚溶热处理对PM镍高温合金组织和力学性能的影响

IF 3

Materialia Pub Date : 2025-06-07 DOI: 10.1016/j.mtla.2025.102445

A.A. Ganeev, V.A. Valitov, Sh.Kh. Mukhtarov, V.M. Imayev

{"title":"Effect of pre-deformation and subsolvus heat treatment on microstructure and mechanical properties of a PM nickel superalloy","authors":"A.A. Ganeev, V.A. Valitov, Sh.Kh. Mukhtarov, V.M. Imayev","doi":"10.1016/j.mtla.2025.102445","DOIUrl":"10.1016/j.mtla.2025.102445","url":null,"abstract":"<div><div>In the present work, the effect of the super- and subsolvus solid solution heat treatment with intermediate pre-deformation (ε=6 and 12 %) at subsolvus temperature and final aging on the microstructure and mechanical properties of the Russian powder metallurgy (PM) nickel base superalloy EP741NP has been studied. The experiments were aimed at achieving serrated grain boundaries to improve the creep resistance and reduce crack growth rate. The as-HIPed material was forged at subsolvus temperatures followed by cutting the workpieces for subsequent processing. Three processing routes were applied: i) solid solution treatment at supersolvus temperature with slow cooling and at subsolvus temperature followed by air cooling and aging; ii) the same with 6 % pre-deformation before subsolvus solution treatment and iii) the same with 12 % pre-deformation before subsolvus solution treatment. As a result, three microstructural conditions were obtained. With increasing pre-deformation from 0 to 12 %, the degree of grain boundary serration and the dislocation substructure density increased. Tensile and impact tests showed that 6–12 % pre-deformation led to more ductile fracture and slightly higher ductility at 650 °C. The 6 % pre-deformation condition also exhibited higher creep resistance and impact strength, which was attributed to the positive effect of serrated grain boundaries and dislocation substructure.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102445"},"PeriodicalIF":3.0,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240625","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

In Situ synthesis and immobilization of Co₃O₄ nanowalls on kanthal substrate using a rapid direct heating approach kanthal底物上快速直接加热原位合成和固定化Co₃O₄纳米壁

IF 3

Materialia Pub Date : 2025-06-03 DOI: 10.1016/j.mtla.2025.102457

Soo-Ling Bee , Chia-Wen Ooi , Swee-Yong Pung , Sin Ling Chiam , Choe Peng Leo , Wai Kian Tan

{"title":"In Situ synthesis and immobilization of Co₃O₄ nanowalls on kanthal substrate using a rapid direct heating approach","authors":"Soo-Ling Bee , Chia-Wen Ooi , Swee-Yong Pung , Sin Ling Chiam , Choe Peng Leo , Wai Kian Tan","doi":"10.1016/j.mtla.2025.102457","DOIUrl":"10.1016/j.mtla.2025.102457","url":null,"abstract":"<div><div>Conventional synthesis methods such as hydrothermal or chemical vapor deposition often involve multi-step processes, long processing times, high energy consumption, or require expensive equipment. In this study, a novel one-step Direct Heating (DH) method for the <em>in-situ</em> synthesis and immobilization of Co<sub>3</sub>O<sub>4</sub> nanowalls on a kanthal coils has been demonstrated. DH method offers a simple, rapid, and energy-efficient approach, allowing for the synthesis and immobilization of Co<sub>3</sub>O<sub>4</sub> nanomaterials in just 20 min with only 30 W of electrical power. The formation of Co<sub>3</sub>O<sub>4</sub> nanowalls was confirmed through X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and field emission scanning electron microscopy. These characterization techniques consistently showed that the nanowalls became larger with increasing heating duration. The optimized Co<sub>3</sub>O<sub>4</sub> nanowalls exhibited a specific capacitance of 193 F/g, with a band gap ranging from 1.81 eV to 2.11 eV. This immobilization of Co<sub>3</sub>O<sub>4</sub> nanowalls using DH method on resistive kanthal substrates presents significant advantages for practical applications in supercapacitors, enabling their integration into electronic devices such as wearable technology.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102457"},"PeriodicalIF":3.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144261640","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

Planar coincident site density is not a reliable predictor of grain boundary energy 平面重合点密度不是晶界能的可靠预测因子

IF 3

Materialia Pub Date : 2025-06-01 DOI: 10.1016/j.mtla.2025.102453

Eileen L. Hung, Zipeng Xu, Gregory S. Rohrer

引用次数: 0

Editors for Materialia 材料编辑

IF 3

Materialia Pub Date : 2025-06-01 DOI: 10.1016/S2589-1529(25)00122-X

引用次数: 0

Novel alginate-hydroxyapatite composite cryogel for bone regeneration 新型海藻酸盐-羟基磷灰石复合骨再生低温凝胶

IF 3

Materialia Pub Date : 2025-06-01 DOI: 10.1016/j.mtla.2025.102456

Serap Sezen , Sevilay Burcu Sahin , Ebru Demir , Sibel Cetinel , Feray Bakan Misirlioglu

{"title":"Novel alginate-hydroxyapatite composite cryogel for bone regeneration","authors":"Serap Sezen , Sevilay Burcu Sahin , Ebru Demir , Sibel Cetinel , Feray Bakan Misirlioglu","doi":"10.1016/j.mtla.2025.102456","DOIUrl":"10.1016/j.mtla.2025.102456","url":null,"abstract":"<div><div>Bone tissue engineering requires biomaterials that not only support cell growth and differentiation but also mimic the mechanical and structural properties of native bones. In this study, we developed a novel alginate-hydroxyapatite (HA) composite cryogel using a one-step cryogelation process, where alginate chains were covalently crosslinked via carbodiimide (EDC) chemistry, with HA incorporated to enhance osteoconductivity. The resulting cryogels were characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Solid-State Nuclear Magnetic Resonance (<sup>13</sup>C NMR), water uptake analysis, mechanical testing, scanning electron microscopy (SEM), and Micro-Computed Tomography (µ-CT). In vitro studies with MC3T3-E1 pre-osteoblasts were conducted to evaluate biocompatibility and osteogenic potential. The cryogels exhibited a highly interconnected porous architecture, maintaining mechanical integrity and excellent swelling properties. Structural and chemical analyses confirmed successful crosslinking and uniform distribution of HA. In vitro cytocompatibility studies demonstrated enhanced cell viability and alkaline phosphatase (ALP) activity, indicating the material’s ability to support osteogenic differentiation. These results suggest that the developed composite cryogels hold great potential as a platform for bone regeneration applications.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"42 ","pages":"Article 102456"},"PeriodicalIF":3.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144223406","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

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