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Comparative study on microstructure and mechanical properties of CMT wire-arc directed energy deposited magnesium alloy assisted by water bath cooling and ultrasonic vibration 水浴冷却和超声波振动辅助 CMT 线弧定向能沉积镁合金微观结构和机械性能的比较研究
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-19 DOI: 10.1016/j.matlet.2024.137741
Huijuan Zhang , Dongqun Xin , Xiangyun Zhang , Kun Wang , En Tang , Xia Pan , Chu Wu
{"title":"Comparative study on microstructure and mechanical properties of CMT wire-arc directed energy deposited magnesium alloy assisted by water bath cooling and ultrasonic vibration","authors":"Huijuan Zhang ,&nbsp;Dongqun Xin ,&nbsp;Xiangyun Zhang ,&nbsp;Kun Wang ,&nbsp;En Tang ,&nbsp;Xia Pan ,&nbsp;Chu Wu","doi":"10.1016/j.matlet.2024.137741","DOIUrl":"10.1016/j.matlet.2024.137741","url":null,"abstract":"<div><div>This study investigates the effects of water bath cooling and interlayer ultrasonic vibration on magnesium alloy (AZ31) components produced through cold metal transfer-based wire arc additive manufacturing (CMT-WAAM). The results showed that water bath cooling had little impact on refining grain size or improving mechanical properties compared to air cooling. In contrast, interlayer ultrasonic vibration treatment significantly refined grain size by 36.8 %, due to cavitation and acoustic streaming effects caused by ultrasonic vibrations. Ultrasonic vibration-treated specimens exhibited enhanced mechanical properties, with yield strength of ∼73 MPa, ultimate tensile strength of ∼220 MPa, and elongation of ∼20 %. The improved strength-ductility synergy was attributed to refinement of grain size and uniform distribution of fine precipitates induced by ultrasonic vibration treatment. These finding suggests that interlayer ultrasonic vibration treatment is an effective method for enhancing the mechanical properties of CMT WAAM-prepared magnesium alloys.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"380 ","pages":"Article 137741"},"PeriodicalIF":2.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Discovery of new compounds at low temperature equilibrium
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-19 DOI: 10.1016/j.matlet.2024.137739
Yue Xing, Zheng Li, Huai Yu Hou, Ying Liu, Zhi Gang Ding, Jing Tao Wang
{"title":"Discovery of new compounds at low temperature equilibrium","authors":"Yue Xing,&nbsp;Zheng Li,&nbsp;Huai Yu Hou,&nbsp;Ying Liu,&nbsp;Zhi Gang Ding,&nbsp;Jing Tao Wang","doi":"10.1016/j.matlet.2024.137739","DOIUrl":"10.1016/j.matlet.2024.137739","url":null,"abstract":"<div><div>Traditional metallurgical experiments face challenges at low temperatures due to increased equilibration time and limited driving force for phase transformations. Compounds predicted by first-principles calculations may only be stable at very low temperatures. However, traditional metallurgical methods based on solidification and cooling processes struggle to overcome the slow kinetics and low phase transformation driving force at these low temperatures. The high-pressure torsion (HPT) method allows the direct synthesis of intermetallic compounds from pure elemental powders at room temperature, which ensures enough phase transition driving force and at the same time leads to rapid diffusion through strong shear strains. In this study, intermetallic compounds in the Mo–Nb system were synthesized for the first time by effectively combining the crystal structure prediction algorithm with the HPT method to break through the limitations of slow diffusion and low driving force.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"381 ","pages":"Article 137739"},"PeriodicalIF":2.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Gel interface for garnet-based lithium metal batteries with high loading cathode 石榴石基高负载正极锂金属电池的凝胶界面
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-19 DOI: 10.1016/j.matlet.2024.137729
Cheng Ouyang , Shaoping Wu , Guoyao Li , Nan Zhang , Qiwen Chen , Rongzi Zhang , Haidong Sun , Chenglan Zhang , Hezhou Liu , Huanan Duan
{"title":"Gel interface for garnet-based lithium metal batteries with high loading cathode","authors":"Cheng Ouyang ,&nbsp;Shaoping Wu ,&nbsp;Guoyao Li ,&nbsp;Nan Zhang ,&nbsp;Qiwen Chen ,&nbsp;Rongzi Zhang ,&nbsp;Haidong Sun ,&nbsp;Chenglan Zhang ,&nbsp;Hezhou Liu ,&nbsp;Huanan Duan","doi":"10.1016/j.matlet.2024.137729","DOIUrl":"10.1016/j.matlet.2024.137729","url":null,"abstract":"<div><div>Garnet-type electrolytes are ideal for lithium-metal batteries due to their high ionic conductivity and electrochemical stability. However, high interfacial resistance caused by poor contact with electrodes remains a challenge. To address this, we developed a flexible gel interlayer via in-situ polymerization to improve interface contact and reduce impedance. Additionally, a thick cathode with a laser-drilled channel structure was constructed to enhance gel electrolyte penetration and discharge capacity. Consequently, the Li/GEL-LLZTO-GEL/Li symmetric cell achieved a critical current density of 1.5 mA cm<sup>−2</sup> and a reduced interfacial resistance of 134 O at room temperature. The quasi-solid half-cell with the laser-drilled cathode maintained a discharge capacity of 132.4 mAh/g with an active material loading of 13.1 mg cm<sup>−2</sup> after 100 cycles. This work provides a simple and effective method for manufacturing safe and stable lithium metal batteries.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"380 ","pages":"Article 137729"},"PeriodicalIF":2.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural and electronic properties of monolayers: Enhancing computational accuracy 单层膜的结构和电子特性：提高计算精度
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-18 DOI: 10.1016/j.matlet.2024.137661
Ahsan Javed , Shahzad Akhtar Ali , Muhammad Asif , Rafi Ullah
{"title":"Structural and electronic properties of monolayers: Enhancing computational accuracy","authors":"Ahsan Javed ,&nbsp;Shahzad Akhtar Ali ,&nbsp;Muhammad Asif ,&nbsp;Rafi Ullah","doi":"10.1016/j.matlet.2024.137661","DOIUrl":"10.1016/j.matlet.2024.137661","url":null,"abstract":"<div><div>Matching theoretical and experimental lattice constants is essential for accurately simulating real-life materials. DFT optimizations often yield lattice constants that deviate from experimental values, especially in 2D materials. For instance, databases like C2DB rely on these theoretical values, which might not always reflect experimental data. Furthermore, PBE-based calculations can misclassify the band gap type while also underestimating its magnitude. A notable example is hexagonal boron nitride, where PBE predicts a direct band gap, although experimentally, it is indirect. This work aims to identify functionals that produce lattice constants and electronic properties more aligned with experimental results for monolayers, thereby enhancing the accuracy of machine learning models in materials discovery.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"380 ","pages":"Article 137661"},"PeriodicalIF":2.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
One-step synthesis of needle-like lanthanum-doped TiO2 nanomaterials and their photoconductivity activity in air medium 一步法合成针状掺杂镧的二氧化钛纳米材料及其在空气介质中的光电导活性
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-17 DOI: 10.1016/j.matlet.2024.137733
Rajkumar C , Arunachalam Arulraj
{"title":"One-step synthesis of needle-like lanthanum-doped TiO2 nanomaterials and their photoconductivity activity in air medium","authors":"Rajkumar C ,&nbsp;Arunachalam Arulraj","doi":"10.1016/j.matlet.2024.137733","DOIUrl":"10.1016/j.matlet.2024.137733","url":null,"abstract":"<div><div>In this study, lanthanum-doped titanium dioxide (La-doped TiO<sub>2</sub>) was synthesized and characterized for the photoconductivity study in an air medium. TiO<sub>2</sub> is well-known semiconductor with excellent optical and electrical properties, making it ideal candidate for optoelectronics applications. However, the incorporation of rare-earth element like La can significantly alter its performance, particularly under light exposure. Further, in this study, the effect of annealing was also carried out. The photosensitivity of La-doped TiO<sub>2</sub> sample annealed at 600 °C shows better photosensitivity as compared to other samples. This enhancement is attributed to the increased carrier concentration and reduced recombination rates of photo-generated electron-hole pairs due to doping of lanthanum. These findings suggest that La-doped TiO<sub>2</sub> holds potential for applications in photodetectors, UV sensors, and other optoelectronic devices operating in ambient conditions.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"380 ","pages":"Article 137733"},"PeriodicalIF":2.7,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High energy density supercapacitor based on Ag doped MoO3 nanorods on a flexible carbon cloth 基于柔性碳布上掺银 MoO3 纳米棒的高能量密度超级电容器
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-16 DOI: 10.1016/j.matlet.2024.137728
Sarda Sharma , Sandeep Singh Chauhan , Karumbaiah N. Chappanda , Mohammad Rizwanur Rahman
{"title":"High energy density supercapacitor based on Ag doped MoO3 nanorods on a flexible carbon cloth","authors":"Sarda Sharma ,&nbsp;Sandeep Singh Chauhan ,&nbsp;Karumbaiah N. Chappanda ,&nbsp;Mohammad Rizwanur Rahman","doi":"10.1016/j.matlet.2024.137728","DOIUrl":"10.1016/j.matlet.2024.137728","url":null,"abstract":"<div><div>In this study, the plain MoO<sub>3</sub> and Ag-doped MoO<sub>3</sub> nanorods are anchored on a flexible fibrous carbon cloth using a hydrothermal method, and their performances are thoroughly evaluated by fabricating the supercapacitors using both types of nanorods. The doped substrate shows drastic enhancement in specific capacitance which is nearly four times greater than undoped MoO<sub>3</sub> nanorods at a current density of 0.5 mA/cm<sup>2</sup>. Additionally, the Ag doped MoO<sub>3</sub> shows an excellent energy density of 43 µWh/cm<sup>2</sup>. The superior performance of the doped nanorods is attributed to its pseudocapacitive behaviour, higher conductivity, and improved charge kinetics at the electrode–electrolyte interface, enabling a more efficient and potential supercapacitor-based energy storage system to drive future low power flexible and wearable electronic devices.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"380 ","pages":"Article 137728"},"PeriodicalIF":2.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Molecular dynamics simulation of arc ablation on Mo or W doped CuCr contact materials 电弧烧蚀掺杂 Mo 或 W 的铜铬接触材料的分子动力学模拟
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-16 DOI: 10.1016/j.matlet.2024.137734
Dawei Feng , Xinye Fu , Jianing Chen , Liang Zhu , Qi Zhao , Ohi H.M. Ikra Amir
{"title":"Molecular dynamics simulation of arc ablation on Mo or W doped CuCr contact materials","authors":"Dawei Feng ,&nbsp;Xinye Fu ,&nbsp;Jianing Chen ,&nbsp;Liang Zhu ,&nbsp;Qi Zhao ,&nbsp;Ohi H.M. Ikra Amir","doi":"10.1016/j.matlet.2024.137734","DOIUrl":"10.1016/j.matlet.2024.137734","url":null,"abstract":"<div><div>To improve the ablation resistance of the contact material in vacuum circuit breakers (VCBs), molecular dynamics (MD) was used to simulate the microscopic arc ablation process. Reinforced CuCr alloys doped with elements Mo or W were designed using ablative mass as the characteristic parameter for ablation resistance. The results demonstrate that Mo or W doping can improve the ablation resistance of the alloys to some extent, and the doped alloys have better ablation resistance than CuCr<sub>50</sub>. Moreover, Mo or W-doped CuCr alloys with an original Cu content of 70–80 at%, which have less ablative mass than CuCr<sub>50</sub>, are most suitable for improving the contacts’ ablation resistance.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137734"},"PeriodicalIF":2.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of uniaxial stress on hydrogen diffusion in α-Fe: A molecular dynamics study 单轴应力对 α-Fe 中氢扩散的影响：分子动力学研究
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-16 DOI: 10.1016/j.matlet.2024.137735
Zhiqin Du , Zhonghao Heng , Chen Jin , Shou Zhao , Jianghua Shen
{"title":"The effect of uniaxial stress on hydrogen diffusion in α-Fe: A molecular dynamics study","authors":"Zhiqin Du ,&nbsp;Zhonghao Heng ,&nbsp;Chen Jin ,&nbsp;Shou Zhao ,&nbsp;Jianghua Shen","doi":"10.1016/j.matlet.2024.137735","DOIUrl":"10.1016/j.matlet.2024.137735","url":null,"abstract":"<div><div>Hydrogen diffusion in metals is of great significance for hydrogen embrittlement and requires comprehension on the atomic scale. In this study, molecular dynamics simulations are conducted to investigate hydrogen diffusion of atoms in α-Fe under different stresses. The increase in uniaxial tensile and compressive stress tends to reduce the diffusion coefficient, suppress the diffusion of hydrogen atoms in α-Fe, and lead to differences in diffusion behavior in different directions. The change in the migration barrier explains the differences in hydrogen atom diffusion behavior under different unidirectional stresses.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137735"},"PeriodicalIF":2.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anti-infective Ti-Cu alloy inhibits bacterial drug resistance 抗感染钛铜合金可抑制细菌耐药性
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-16 DOI: 10.1016/j.matlet.2024.137736
Zhiqiang Xu , Min Liu , Na Zhao , Guocai Chen , Weicheng Lu , Haixin Li , Yuanyan Wu , Hao Tan , Chunguang Yang , Xinrui Zhang
{"title":"Anti-infective Ti-Cu alloy inhibits bacterial drug resistance","authors":"Zhiqiang Xu ,&nbsp;Min Liu ,&nbsp;Na Zhao ,&nbsp;Guocai Chen ,&nbsp;Weicheng Lu ,&nbsp;Haixin Li ,&nbsp;Yuanyan Wu ,&nbsp;Hao Tan ,&nbsp;Chunguang Yang ,&nbsp;Xinrui Zhang","doi":"10.1016/j.matlet.2024.137736","DOIUrl":"10.1016/j.matlet.2024.137736","url":null,"abstract":"<div><div>Implant-associated infection is mainly conducted with antibiotics in clinic. However, the overuse and abuse of antibiotics contributes to resistant infections, increasing the difficulty of treatment. In this work, we initially investigate the effect of anti-infective Ti-Cu alloy incorporating with antibiotics (ciprofloxacin) to inhibit <em>methicillin-resistant Staphylococcus aureus</em> (MRSA) infections. Results show that, for Drug + Ti-Cu alloy group, the minimum inhibitory concentration (MIC) of antibiotics reduces by 76.00 %, minimum bactericidal concentration (MBC) reduces by 75.00 % and IC<sub>50</sub> reduces by 77.77 %. Scanning electron microscope (SEM) and laser confocal scanning microscope (CLSM) observations demonstrate that Ti-Cu alloy inhibits biofilms, including inhibiting bacterial activity and extracellular polymer substrates (EPS) secretion. We conclude high redox oxygen species (ROS) expression contributes to the excellent anti-infection capabilities of Ti-Cu alloy. Our work opens an avenue for addressing persistent drug resistant bacterial infections.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137736"},"PeriodicalIF":2.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of ultrasonic surface rolling process on the microstructure and wear resistance of 2195 Al-Li alloy processed by laser powder bed fusion 超声波表面滚压工艺对激光粉末床熔融法加工的 2195 Al-Li 合金微观结构和耐磨性的影响
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2024-11-15 DOI: 10.1016/j.matlet.2024.137732
L. Li, W. Zhang, G.Q. Jiang, X.K. Meng, H.M. Zhang, P.F. Li, S. Huang, J.Z. Zhou
{"title":"Effects of ultrasonic surface rolling process on the microstructure and wear resistance of 2195 Al-Li alloy processed by laser powder bed fusion","authors":"L. Li,&nbsp;W. Zhang,&nbsp;G.Q. Jiang,&nbsp;X.K. Meng,&nbsp;H.M. Zhang,&nbsp;P.F. Li,&nbsp;S. Huang,&nbsp;J.Z. Zhou","doi":"10.1016/j.matlet.2024.137732","DOIUrl":"10.1016/j.matlet.2024.137732","url":null,"abstract":"<div><div>This study presents a comparative analysis of the impacts of surface rolling (SR) and ultrasonic surface rolling (USR) techniques on the microstructure and wear resistance of 2195 Al-Li alloy processed by laser powder bed fusion (LPBF). The results show that both SR and USR processes induced grain refinement, increased dislocation density, and converted tensile residual stress into compressive residual stress in the surface layer of the original samples. Compared to the SR process, the USR process exhibited more pronounced strengthening effects due to its unique acoustic effect and dynamic recrystallization mechanism. With the application of USR, the average coefficient of friction for the sample reduced from 0.41 to 0.32. This enhancement in wear resistance can be attributed to the synergistic effects of grain boundary strengthening, dislocation strengthening, and stress strengthening mechanisms.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137732"},"PeriodicalIF":2.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","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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