Materialia最新文献_第4页

New insights into massive transformation: In-situ X-ray observations and diffuse interface analysis of δ to γ transformation in TRIP steels 大规模转变的新见解：原位x射线观察和TRIP钢中δ到γ转变的扩散界面分析

IF 3

Materialia Pub Date : 2025-05-12 DOI: 10.1016/j.mtla.2025.102431

Ahmad Zamanian , Seong Gyoon Kim , Nam Hoon Goo , Soo Yeon Lee , Yoon Uk Heo , Jae Sang Lee , Dae Geun Hong , Jong Hyun Kim , Ho Jae Kwak , Cheol Hee Nam , Chang Hee Yim

{"title":"New insights into massive transformation: In-situ X-ray observations and diffuse interface analysis of δ to γ transformation in TRIP steels","authors":"Ahmad Zamanian , Seong Gyoon Kim , Nam Hoon Goo , Soo Yeon Lee , Yoon Uk Heo , Jae Sang Lee , Dae Geun Hong , Jong Hyun Kim , Ho Jae Kwak , Cheol Hee Nam , Chang Hee Yim","doi":"10.1016/j.mtla.2025.102431","DOIUrl":"10.1016/j.mtla.2025.102431","url":null,"abstract":"<div><div>Recent in-situ studies on carbon steel solidification have shown that the δ to γ transformation can occur at a high degree of undercooling, even in the single γ-phase region, a transformation referred to as massive or massive-like by researchers. In this study, the δ to γ phase transformation of two experimental TRIP steels was investigated using a setup that integrates X-ray imaging, Laue diffraction, and precise temperature measurement. Steel T1, a hypo-peritectic alloy (0.1% C-1.23% Mn-1.97% Si), and Steel T2, a hyper-peritectic alloy (0.23% C-1.55% Mn-1.87% Si), were compared. The results reveal that the δ to γ transformation in both steels occurred within the single γ-phase region, but at significantly different rates. Compared to carbon steels with lower Mn and Si content, these steels exhibit differences in behavior, as discussed in the results section.</div><div>The thermodynamic and interface kinetic of the δ to γ transformation were investigated to gain deeper insights into this transformation behavior. Thermodynamic analysis reveals that the transformation in both steels is strongly dependent on undercooling from the <span><math><msub><mi>T</mi><mn>0</mn></msub></math></span> temperature, rather than the equilibrium peritectic temperature. Using a diffuse interface model of massive transformation, the kinetics of the δ to γ transformation were analyzed. The results showed two distinct regimes in the relationship between interface velocity and thermodynamic driving force: a low-velocity regime with partitioning of C, Mn, and Si, and a high-velocity regime with almost no partitioning of Mn and Si. The massive transformations observed in these steels occurred in the low and high-velocity regimes, respectively.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"41 ","pages":"Article 102431"},"PeriodicalIF":3.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069970","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

Fast pressureless sintering of highly infrared-transparent MgAlON ceramics at a low temperature using CaCO3-doped coarse bimodal powder 用caco3掺杂的粗双峰粉末在低温下快速无压烧结高红外透明MgAlON陶瓷

IF 3

Materialia Pub Date : 2025-05-08 DOI: 10.1016/j.mtla.2025.102425

Chaojun Huang , Haoran Guo , Yingchun Shan , Meng Yuan , Jiujun Xu , Jiangtao Li

{"title":"Fast pressureless sintering of highly infrared-transparent MgAlON ceramics at a low temperature using CaCO3-doped coarse bimodal powder","authors":"Chaojun Huang , Haoran Guo , Yingchun Shan , Meng Yuan , Jiujun Xu , Jiangtao Li","doi":"10.1016/j.mtla.2025.102425","DOIUrl":"10.1016/j.mtla.2025.102425","url":null,"abstract":"<div><div>By doping CaCO<sub>3</sub> as sintering additive into the coarse MgAlON powder characterized by bimodal particle size distribution (D<sub>50</sub>=0.9 µm), highly infrared-transparent MgAlON ceramics were successfully fabricated by pressureless sintering at 1790 °C for 90 min. The transmittance of 2 mm thick samples reaches 83.6% at 3750 nm. The fabricated MgAlON ceramics exhibit better transparency than those sintered at 1880 °C for 150 min, which were prepared via doping with Y<sub>2</sub>O<sub>3</sub> as additive or using fine unimodal MgAlON powder (D<sub>50</sub>=0.5 µm). Furthermore, using the coarse bimodal powder, transmittance of the CaCO<sub>3</sub>-doped MgAlON can be enhanced by increasing temperature and holding time, with 87.6% (at 3750 nm) transmittance achieved when sintered at 1880 °C for 150 min. Both the robust sintering additive of CaCO<sub>3</sub> and the bimodal particle size distribution of the MgAlON powder, contribute to the fast densification and excellent transparency of the fabricated MgAlON ceramics.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"41 ","pages":"Article 102425"},"PeriodicalIF":3.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144088830","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

Synthesis and Characterization of K-Doped SiO₂ nanoparticles with blue persistent luminescence: A novel approach using the sol-gel method 具有蓝色持续发光的k掺杂二氧化硅纳米颗粒的合成和表征：一种新的溶胶-凝胶方法

IF 3

Materialia Pub Date : 2025-05-08 DOI: 10.1016/j.mtla.2025.102426

Madara Leimane, Virginija Vitola, Katrina Laganovska, Ernests Einbergs, Milena Dile, Aleksejs Zolotarjovs

{"title":"Synthesis and Characterization of K-Doped SiO₂ nanoparticles with blue persistent luminescence: A novel approach using the sol-gel method","authors":"Madara Leimane, Virginija Vitola, Katrina Laganovska, Ernests Einbergs, Milena Dile, Aleksejs Zolotarjovs","doi":"10.1016/j.mtla.2025.102426","DOIUrl":"10.1016/j.mtla.2025.102426","url":null,"abstract":"<div><div>While persistent luminescence (PersL) materials have many important applications and are actively being studied, blue-emitting phosphors propose the biggest challenges and lack of suitable materials. Among any solids that can serve as blue emitting PersL matrices, amorphous silicon dioxide (SiO<sub>2</sub>) stands out with great chemical stability, high transparency, radiation resistance, and easly of adjusting the shape. We demonstrate a novel and environmentally friendly method for synthesising PersL SiO<sub>2</sub> nanoparticles doped with K ions. Optical and morphological properties of amorphous silica nanoparticles were studied in the course of slightly doping pure silica with K ions (0.1; 0.5; 1.0 and 1.5 at%). An intensive blue photoluminescence (PL) with a maximum of 465 nm (2.7 eV) and another band at 327 nm (3.8 eV) were detected for K-doped samples, which is not normally present for pure silica glass. The 0.1 and 0.5 at% K- K-doped samples exhibit blue persistent luminescence (PersL) that lasts up to a minute. Similar blue PL bands have been reported for porous silicas doped with Na and K ions, but no information about the nanoparticle's morphology and PL decay kinetics has been discovered. The temperature-dependent PL afterglow for 0.5 at% K-doped sample is observed to be slightly more intense at 100 K and 10 K compared to room temperature, suggesting its use at lower temperatures. Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray (EDX) microanalysis confirmed the presence of K in amorphous silica. Increasing the K ion concentration leads to larger particle size and aggregation.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"41 ","pages":"Article 102426"},"PeriodicalIF":3.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070861","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

Suppressing liquid Bi intergranular penetration in Cu by tailoring grain boundary mobility 通过调整晶界迁移率抑制液态铋在Cu中的晶间渗透

IF 3

Materialia Pub Date : 2025-05-01 DOI: 10.1016/j.mtla.2025.102419

Yuanshen Qi , Xin Bin , Anna Kosinova , Askar R. Kilmametov , Boris B. Straumal , Eugen Rabkin

引用次数: 0

Microwave-assisted synthesis of Ta-modified V2O5 from vanadium powder for rapid response NH3 sensor at room temperature 微波辅助下由钒粉合成ta修饰的室温快速响应NH3传感器V2O5

IF 3

Materialia Pub Date : 2025-05-01 DOI: 10.1016/j.mtla.2025.102421

Phan Hai Anh, Nguyen Duc Phuong Nam, Bui Xuan Hoang, Nguyen Huy Tuan, Nguyen Thanh Nghi, Lai Khac Hoang, Luong Huu Phuoc, Dang Duc Vuong, Vu Xuan Hien

{"title":"Microwave-assisted synthesis of Ta-modified V2O5 from vanadium powder for rapid response NH3 sensor at room temperature","authors":"Phan Hai Anh, Nguyen Duc Phuong Nam, Bui Xuan Hoang, Nguyen Huy Tuan, Nguyen Thanh Nghi, Lai Khac Hoang, Luong Huu Phuoc, Dang Duc Vuong, Vu Xuan Hien","doi":"10.1016/j.mtla.2025.102421","DOIUrl":"10.1016/j.mtla.2025.102421","url":null,"abstract":"<div><div>The rise in global living standards is accompanied by the drawback of increasing emissions of pollutants and toxic gases, which adversely impact human health and the environment. This issue has spurred the demand for the development of highly efficient and cost-effective gas sensors. In this study, we present the gas-sensing properties of Ta-modified V₂O₅ thin films synthesized directly from vanadium and tantalum metal powders using a microwave-assisted method. The morphology and structural characteristics of the synthesized materials were investigated and analyzed using techniques such as SEM, TEM, XRD, and UV–Vis spectroscopy. The NH₃ sensing performance of the Ta-modified V₂O₅ films was evaluated at room temperature. Notably, the 3 wt% Ta-modified V₂O₅ film exhibited a response time of 1 s to 17 ppm NH₃, with the response magnitude of 1.39. With its straightforward synthesis process, Ta-modified V₂O₅ nanomaterials hold significant potential as room-temperature NH₃ gas sensors.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"40 ","pages":"Article 102421"},"PeriodicalIF":3.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886379","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

Improved cyclic stability of elastocaloric effect in NiTi alloys via low-angle cyclic torsion 通过低角度循环扭转提高NiTi合金弹热效应的循环稳定性

IF 3

Materialia Pub Date : 2025-05-01 DOI: 10.1016/j.mtla.2025.102422

Zhenquan Zhang , Ziqi Guan , Yanxu Wang , Jun Hu , Zhenzhuang Li , Jiwei Yao , Changjiang Bao , Kun Zhang , Bing Li

引用次数: 0

Editors for Materialia

IF 3

Materialia Pub Date : 2025-05-01 DOI: 10.1016/S2589-1529(25)00095-X

引用次数: 0

Segregation-induced hydrogen embrittlement in titanium 钛中偏析引起的氢脆

IF 3

Materialia Pub Date : 2025-04-28 DOI: 10.1016/j.mtla.2025.102411

Rainer Falkenberg , Reza Darvishi Kamachali

{"title":"Segregation-induced hydrogen embrittlement in titanium","authors":"Rainer Falkenberg , Reza Darvishi Kamachali","doi":"10.1016/j.mtla.2025.102411","DOIUrl":"10.1016/j.mtla.2025.102411","url":null,"abstract":"<div><div>Although titanium offers an optimal combination of strength, low weight, and toughness for various applications, it suffers from a drawback: loss of ductility upon exposure to hydrogen. In this work, we couple CALPHAD-integrated density-based thermodynamic modelling of hydrogen segregation with an experimentally calibrated fracture model to investigate its on crack propagation in titanium. Here we propose to model the crack propagation path as a quasi-interface with slightly opened structure and reduced atomic density, enabling interstitial hydrogen segregation. The atomic density is then directly linked with the damage parameter. We found that hydrogen segregation in titanium undergoes a significant transition such that above a threshold of only few atomic percent hydrogen in the solid solution, the interfacial hydrogen concentration exceeds 20 at.%. Integrating this information into our fracture model, the material damage evolution could be explained by a segregation-affected Griffith crack energy, resulting in material decohesion. We found that the segregation transition and subsequent embrittlement effects are critically sensitive to the temperature in the system. The present results suggest a mechanism underlying the sudden loss of fracture toughness during crack propagation, in relation to the ductile-to-brittle transition observed in titanium alloys exposed to hydrogen. The proposed CALPHAD-integrated chemo-mechanical framework can be further generalised for studying more complex failure mechanisms in various materials.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"41 ","pages":"Article 102411"},"PeriodicalIF":3.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946612","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

Beyond transmission electron microscopy imaging: Atom probe tomography reveals chemical inhomogeneity at stacking fault interfaces in InGaN/GaN light-emitting diodes 超越透射电子显微镜成像：原子探针断层扫描揭示了InGaN/GaN发光二极管层错界面的化学不均匀性

IF 3

Materialia Pub Date : 2025-04-23 DOI: 10.1016/j.mtla.2025.102417

Ruiying Shu , Rachel A. Oliver , Martin Frentrup , Menno J. Kappers , Huixin Xiu , Gunnar Kusch , David J. Wallis , Christina Hofer , Paul A.J. Bagot , Michael P. Moody

{"title":"Beyond transmission electron microscopy imaging: Atom probe tomography reveals chemical inhomogeneity at stacking fault interfaces in InGaN/GaN light-emitting diodes","authors":"Ruiying Shu , Rachel A. Oliver , Martin Frentrup , Menno J. Kappers , Huixin Xiu , Gunnar Kusch , David J. Wallis , Christina Hofer , Paul A.J. Bagot , Michael P. Moody","doi":"10.1016/j.mtla.2025.102417","DOIUrl":"10.1016/j.mtla.2025.102417","url":null,"abstract":"<div><div>In this study, we present an atom probe tomography investigation of zincblende InGaN-based multi-quantum well light-emitting diode (LED) structures with a specific focus on the influence of stacking faults within the system. We demonstrate that the visualisation of stacking faults in atom probe reconstructions is possible due to previously documented sensitivities of measured composition in III-V materials to local variations in electric field during the experiment. Meanwhile, we quantify the composition of indium (In) in the InGaN quantum wells and establish that elongated regions exist, parallel to ridges on the sample surface, in which the indium content is increased. We discuss this observation in the context of previous scanning transmission electron microscopy (STEM) data which suggested that such In rich regions are associated with stacking faults. Our experiments not only showcase the feasibility of stacking fault characterization in InGaN-based multi-quantum well LEDs through atom probe tomography (APT) but also offer a practical pathway towards three-dimensional imaging and compositional analysis of stacking faults at the atomic scale.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"40 ","pages":"Article 102417"},"PeriodicalIF":3.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143881302","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

High-quality CdTe thin film growth on Te-treated GaAs (111)B substrate 在te处理的GaAs (111)B衬底上生长高质量CdTe薄膜

IF 3

Materialia Pub Date : 2025-04-22 DOI: 10.1016/j.mtla.2025.102418

Van Quang Nguyen , Thi Huong Nguyen , Minh-Anh Tran , Chinh Tam Le , Cao Khang Nguyen , Tam Tran Van , Yong Soo Kim , June Hyuk Lee , Van Thiet Duong , The Long Phan , Anh Duc Nguyen , Do Duc Cuong , Sunglae Cho

{"title":"High-quality CdTe thin film growth on Te-treated GaAs (111)B substrate","authors":"Van Quang Nguyen , Thi Huong Nguyen , Minh-Anh Tran , Chinh Tam Le , Cao Khang Nguyen , Tam Tran Van , Yong Soo Kim , June Hyuk Lee , Van Thiet Duong , The Long Phan , Anh Duc Nguyen , Do Duc Cuong , Sunglae Cho","doi":"10.1016/j.mtla.2025.102418","DOIUrl":"10.1016/j.mtla.2025.102418","url":null,"abstract":"<div><div>We report the high-quality growth of CdTe(111) films on GaAs(111)B substrates despite a significant lattice mismatch of 14.6 %, achieved using molecular beam epitaxy (MBE). The quality of the CdTe films was found to be highly dependent on the pre-treatment of the GaAs substrates. Notably, the best crystallinity was achieved on Te-treated GaAs(111)B substrates at elevated temperatures. CdTe films were successfully epitaxially grown along the [111] direction on Te-treated GaAs(111)B substrates over a wide temperature range of 50 to 320 °C, with improved crystallinity observed at higher temperatures. The optimal growth temperature for high-quality CdTe films was determined to be between 270 and 320 °C. Additionally, film crystallinity was found to improve with increasing thickness due to strain relaxation. <u>When the CdTe film thickness approached approximately 500</u> <u>nm, photoluminescence measurements showed a significant reduction in defect-related emissions, suggesting improved optical quality.</u></div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"41 ","pages":"Article 102418"},"PeriodicalIF":3.0,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069417","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