Pub Date : 2024-08-07DOI: 10.1016/j.jmrt.2024.08.004
Xiaohua Gu, Anyu Fan, Siwen Liu, Wei long Chen, Shangwen Zhu, Chin Hao Chong, Zhifang Li, Yan Liu
Catalyzed by MoO, mullite whiskers were synthesized through a molten salt method. This study comprehensively explored the impact of reaction temperature, MoO mass fraction, and calcination temperature on the morphology of mullite whiskers. Employing analytical techniques such as XRD and SEM, the phase composition and morphology of the samples were meticulously scrutinized. The results unveiled that at a MoO mass fraction of 7–8% (molar fraction) and a calcination temperature of 800 °C, mullite whiskers demonstrated a heightened level of purity. Building on these observations, the study delved into the mechanistic underpinnings of MoO as a catalyst in mullite whisker synthesis. It is proved that the metal oxides contained in the silica-alumina glue slag can also form a local liquid phase at low temperatures, reducing the viscosity of the reaction system and liquefaction temperature. The addition of molybdenum oxide makes the reaction process of mullite whisker growth shorter. At the same time, the addition of molybdenum oxide can effectively reduce the viscosity of the reaction system, thus lowering the reaction temperature and increasing the reaction efficiency. In addition molybdenum oxide can be used as a templating agent to induce the growth of mullite whiskers along specific crystal planes. Compared with aluminum fluoride catalysis, molybdenum oxide does not produce the hazardous gas HF, the sublimated molybdenum oxide gas can be recycled, and the molybdenum oxide attached to the whiskers can also be dissolved in water. These theories provide experience in the large-scale preparation of mullite whiskers.
在氧化钼的催化下，通过熔盐法合成了莫来石晶须。本研究全面探讨了反应温度、MoO 质量分数和煅烧温度对莫来石晶须形貌的影响。利用 XRD 和 SEM 等分析技术，对样品的相组成和形态进行了细致的研究。结果表明，在氧化亚墨质量分数为 7-8%（摩尔分数）、煅烧温度为 800 °C 的条件下，莫来石晶须的纯度更高。基于这些观察结果，研究深入探讨了氧化钼作为莫来石晶须合成催化剂的机理基础。研究证明，二氧化硅-氧化铝胶渣中含有的金属氧化物还能在低温下形成局部液相，从而降低反应体系的粘度和液化温度。氧化钼的加入使莫来石晶须生长的反应过程缩短。同时，氧化钼的加入还能有效降低反应体系的粘度，从而降低反应温度，提高反应效率。此外，氧化钼还可用作模板剂，诱导莫来石晶须沿特定晶面生长。与氟化铝催化反应相比，氧化钼不会产生有害气体 HF，升华后的氧化钼气体可以回收利用，而且附着在晶须上的氧化钼还可以溶解在水中。这些理论为大规模制备莫来石晶须提供了经验。
{"title":"Molybdenum oxide catalyzed low temperature preparation of mullite whisker from silica-alumina gel slag","authors":"Xiaohua Gu, Anyu Fan, Siwen Liu, Wei long Chen, Shangwen Zhu, Chin Hao Chong, Zhifang Li, Yan Liu","doi":"10.1016/j.jmrt.2024.08.004","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.004","url":null,"abstract":"Catalyzed by MoO, mullite whiskers were synthesized through a molten salt method. This study comprehensively explored the impact of reaction temperature, MoO mass fraction, and calcination temperature on the morphology of mullite whiskers. Employing analytical techniques such as XRD and SEM, the phase composition and morphology of the samples were meticulously scrutinized. The results unveiled that at a MoO mass fraction of 7–8% (molar fraction) and a calcination temperature of 800 °C, mullite whiskers demonstrated a heightened level of purity. Building on these observations, the study delved into the mechanistic underpinnings of MoO as a catalyst in mullite whisker synthesis. It is proved that the metal oxides contained in the silica-alumina glue slag can also form a local liquid phase at low temperatures, reducing the viscosity of the reaction system and liquefaction temperature. The addition of molybdenum oxide makes the reaction process of mullite whisker growth shorter. At the same time, the addition of molybdenum oxide can effectively reduce the viscosity of the reaction system, thus lowering the reaction temperature and increasing the reaction efficiency. In addition molybdenum oxide can be used as a templating agent to induce the growth of mullite whiskers along specific crystal planes. Compared with aluminum fluoride catalysis, molybdenum oxide does not produce the hazardous gas HF, the sublimated molybdenum oxide gas can be recycled, and the molybdenum oxide attached to the whiskers can also be dissolved in water. These theories provide experience in the large-scale preparation of mullite whiskers.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"191 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930367","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}
Pub Date : 2024-08-06DOI: 10.1016/j.jmrt.2024.07.129
Karine Miranda de Souza Tavares, Natália Tavares Gomes, Gustavo de Castro Xavier, Sidnei José Gomes Sousa, Afonso Rangel Garcez de Azevedo, Carlos Maurício Fontes Vieira, Jonas Alexandre, Sérgio Neves Monteiro
The construction industry has been constantly expanding and is, consequently responsible for a high consumption volume of natural raw materials and for generating large amounts of waste. In detriment of this scenario, this research proposes the reuse of Construction and Demolition Waste (CDW), especially that from plaster for making mortars. The residue was thermo-activated at 650 °C for a period of 2h, a heating rate of 10 °C/min, it was crushed in a jaw crusher and passed through an ABNT N° 16 sieve. The mortars were prepared with a (cement:sand) ratio of 1:6 by mass, the sand was partially replaced by the residue in proportions of 0, 10, 20 and 30%, using Ordinary Portland Cement (OPC). Tests were carried out on consistency index, mass density, incorporated air content, isothermal calorimetry, water retention, mass density in the hardened state, flexural strength, compressive strength, water absorption and void index, in addition to testing techniques characterization, such as laser granulometry, pozzolanic activity using the Modified Chapelle method and Lúxan method, X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) as well as Mercury Intrusion Porosimetry (MIP). It was possible to observe that the residue has amorphous phases, through XRD and heterogeneous nucleation of smaller particles, proven by the calorimetry test, contributing to the increase in mechanical strength. The results indicate that the mixture with 30% replacement achieved a greater increase in mechanical strength, lower absorption rates and consequently, a reduction in the distribution of pore sizes.
{"title":"Microstructural behavior of mortars containing thermo-activated crushed demolition residue (TCDR)","authors":"Karine Miranda de Souza Tavares, Natália Tavares Gomes, Gustavo de Castro Xavier, Sidnei José Gomes Sousa, Afonso Rangel Garcez de Azevedo, Carlos Maurício Fontes Vieira, Jonas Alexandre, Sérgio Neves Monteiro","doi":"10.1016/j.jmrt.2024.07.129","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.129","url":null,"abstract":"The construction industry has been constantly expanding and is, consequently responsible for a high consumption volume of natural raw materials and for generating large amounts of waste. In detriment of this scenario, this research proposes the reuse of Construction and Demolition Waste (CDW), especially that from plaster for making mortars. The residue was thermo-activated at 650 °C for a period of 2h, a heating rate of 10 °C/min, it was crushed in a jaw crusher and passed through an ABNT N° 16 sieve. The mortars were prepared with a (cement:sand) ratio of 1:6 by mass, the sand was partially replaced by the residue in proportions of 0, 10, 20 and 30%, using Ordinary Portland Cement (OPC). Tests were carried out on consistency index, mass density, incorporated air content, isothermal calorimetry, water retention, mass density in the hardened state, flexural strength, compressive strength, water absorption and void index, in addition to testing techniques characterization, such as laser granulometry, pozzolanic activity using the Modified Chapelle method and Lúxan method, X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) as well as Mercury Intrusion Porosimetry (MIP). It was possible to observe that the residue has amorphous phases, through XRD and heterogeneous nucleation of smaller particles, proven by the calorimetry test, contributing to the increase in mechanical strength. The results indicate that the mixture with 30% replacement achieved a greater increase in mechanical strength, lower absorption rates and consequently, a reduction in the distribution of pore sizes.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930365","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}
Pub Date : 2024-08-05DOI: 10.1016/j.jmrt.2024.08.003
Tzu-Teng Huang, Dieter Rahmadiawan, Shih-Chen Shi
This study explores the synthesis and application of carbon-negative technology that leverage circular economy and environmentally friendly methodologies. Porous silica using plant-derived silica sources and self-assembled lignin templates were prepared, achieving an impresive surface area of up to 104.76 m/g. Additionally, we prepared porous composite films via a freeze-drying process incorporating polyvinyl alcohol (PVA). These films demonstrated enhanced tensile properties, with a tensile strength reaching 285.72 kPa. Notably, the film surfaces engaged in a third-body tribology mechanism, which endowed them with excellent abrasion resistance and a low friction coefficient. The specific surface area of the films was measured at 20.15 m/g, making them ideal substrates for CO₂ adsorption functionalization. The functionalized films showcased outstanding CO₂ adsorption capabilities, with a maximum uptake of 29.38 mg/g. Furthermore, they retained over 90% of their adsorption capacity after five adsorption/desorption cycles. Under high CO₂ conditions, these composite films combine the desirable attributes of both solid and liquid adsorbents—high surface area, low volatility, and adsorption stability—contributing significantly to greenhouse gas mitigation and the pursuit of carbon neutrality.
{"title":"Synthesis and characterization of porous silica and composite films for enhanced CO₂ adsorption: A circular economy approach","authors":"Tzu-Teng Huang, Dieter Rahmadiawan, Shih-Chen Shi","doi":"10.1016/j.jmrt.2024.08.003","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.003","url":null,"abstract":"This study explores the synthesis and application of carbon-negative technology that leverage circular economy and environmentally friendly methodologies. Porous silica using plant-derived silica sources and self-assembled lignin templates were prepared, achieving an impresive surface area of up to 104.76 m/g. Additionally, we prepared porous composite films via a freeze-drying process incorporating polyvinyl alcohol (PVA). These films demonstrated enhanced tensile properties, with a tensile strength reaching 285.72 kPa. Notably, the film surfaces engaged in a third-body tribology mechanism, which endowed them with excellent abrasion resistance and a low friction coefficient. The specific surface area of the films was measured at 20.15 m/g, making them ideal substrates for CO₂ adsorption functionalization. The functionalized films showcased outstanding CO₂ adsorption capabilities, with a maximum uptake of 29.38 mg/g. Furthermore, they retained over 90% of their adsorption capacity after five adsorption/desorption cycles. Under high CO₂ conditions, these composite films combine the desirable attributes of both solid and liquid adsorbents—high surface area, low volatility, and adsorption stability—contributing significantly to greenhouse gas mitigation and the pursuit of carbon neutrality.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930369","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}
The strain rate dependence of mechanical behavior in an AlSi10Mg alloy with different states fabricated by laser powder bed fusion (LPBF) was investigated systematically via thermodynamic calculations, microstructure characterization and mechanical characteristic evaluation in the present study. The results show that there is a close relationship among the material state, microstructure and dynamic mechanical behavior. Before tensile deformation, the as-built specimen possesses a fine equiaxed grain structure and a typical cellular structure surrounded by continuously distributed particles; the annealed specimen has coarser equiaxed grain structures and particles, but no cellular structure is present. Both the as-built and annealed specimens exhibit weak strain rate sensitivity, and the strain rate sensitivity parameters are 0.01 and 0.024, respectively. Under specific strain rate conditions, the as-built specimen has a higher strength and lower elongation than the annealed specimen. After tensile deformation, there is a significant increase in the dislocation density. Independent of the material state, the dislocation density increases with increasing strain rate. Compared with the as-built specimen, the annealed specimen has a stronger strain rate sensitivity because of the greater dislocation density variation.
{"title":"Strain rate dependence of mechanical behavior in an AlSi10Mg alloy with different states fabricated by laser powder bed fusion","authors":"Xiaofeng Wang, Xiaolong Nan, Cunqiang Ma, Tongya Shi, Mingxing Guo, Jianbo Hu, Yonggang Wang","doi":"10.1016/j.jmrt.2024.08.006","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.08.006","url":null,"abstract":"The strain rate dependence of mechanical behavior in an AlSi10Mg alloy with different states fabricated by laser powder bed fusion (LPBF) was investigated systematically via thermodynamic calculations, microstructure characterization and mechanical characteristic evaluation in the present study. The results show that there is a close relationship among the material state, microstructure and dynamic mechanical behavior. Before tensile deformation, the as-built specimen possesses a fine equiaxed grain structure and a typical cellular structure surrounded by continuously distributed particles; the annealed specimen has coarser equiaxed grain structures and particles, but no cellular structure is present. Both the as-built and annealed specimens exhibit weak strain rate sensitivity, and the strain rate sensitivity parameters are 0.01 and 0.024, respectively. Under specific strain rate conditions, the as-built specimen has a higher strength and lower elongation than the annealed specimen. After tensile deformation, there is a significant increase in the dislocation density. Independent of the material state, the dislocation density increases with increasing strain rate. Compared with the as-built specimen, the annealed specimen has a stronger strain rate sensitivity because of the greater dislocation density variation.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930366","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}
{"title":"Corrigendum to polycaprolactone/sodium alginate membrane with MgZnO nanoparticles for treatment of periodontal infection in diabetic wistaar rats [J Mater Res Technol 29 (2024) 3366-3379]","authors":"Tahreem Tanweer, Nosheen Fatima Rana, Ayesha Naeem, Iqra Shafique, Farid Menaa","doi":"10.1016/j.jmrt.2024.07.231","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.231","url":null,"abstract":"","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930351","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}
Titanium alloys are extensively utilized in the aerospace industry due to their exceptional strength and resistance to corrosion. However, litmited performance and high dispersion has always existed for the traditional manufacturing process. A novel Electroshock Treatment (EST) procedure proposed by author's team can synergistically improve the mechanical properties and its consistency of titanium alloys under limited temperature rise, but the relevant mechanism is not yet clear. In present work, the effects of various EST conditions on the mechanical characteristics were investigated by uniaxial tensile testing, and the effect mechanism was revealed using multi-scale microstructure characterization of titanium alloys, such as SEM, EBSD and TEM. The uniaxial tensile test results show that, compared with the sample without EST, the average elongation after fracture improved by 12.5%, the strength-plastic product improved by 16.1%, and the consistency of UTS and elongation after fracture improved by 63.4% and 57.1%, respectively, with a slight increase of tensile strength (30 MPa) after appropriate treatment (current density of 0.93 × 10A/m, and pulse duration of 300 ms). The multi-scale microscopic characterization reveals a more uniform distribution of stress concentration in TC11 titanium alloy following the appropriate EST process. Besides, the entanglement of dislocations is reduced with some dislocations being annihilated. Especially, the remaining dislocations undergoing orderly rearrangement at grain boundaries after EST. The homogenization of local lattice distortion distribution and orderly rearrangement of dislocations at grain boundaries are the primary factors contributing to the comprehensive improvement in the mechanical properties and consistency of TC11 Titanium alloy.
{"title":"Mechanical properties improvement of titanium alloy and its grain boundary dislocation evolution mechanism by novel electroshock treatment","authors":"Zhongmei Wang, Jue Lu, Yanli Song, Yongqing Yu, Yuhang Wu, Lechun Xie, Lin Hua","doi":"10.1016/j.jmrt.2024.07.234","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.234","url":null,"abstract":"Titanium alloys are extensively utilized in the aerospace industry due to their exceptional strength and resistance to corrosion. However, litmited performance and high dispersion has always existed for the traditional manufacturing process. A novel Electroshock Treatment (EST) procedure proposed by author's team can synergistically improve the mechanical properties and its consistency of titanium alloys under limited temperature rise, but the relevant mechanism is not yet clear. In present work, the effects of various EST conditions on the mechanical characteristics were investigated by uniaxial tensile testing, and the effect mechanism was revealed using multi-scale microstructure characterization of titanium alloys, such as SEM, EBSD and TEM. The uniaxial tensile test results show that, compared with the sample without EST, the average elongation after fracture improved by 12.5%, the strength-plastic product improved by 16.1%, and the consistency of UTS and elongation after fracture improved by 63.4% and 57.1%, respectively, with a slight increase of tensile strength (30 MPa) after appropriate treatment (current density of 0.93 × 10A/m, and pulse duration of 300 ms). The multi-scale microscopic characterization reveals a more uniform distribution of stress concentration in TC11 titanium alloy following the appropriate EST process. Besides, the entanglement of dislocations is reduced with some dislocations being annihilated. Especially, the remaining dislocations undergoing orderly rearrangement at grain boundaries after EST. The homogenization of local lattice distortion distribution and orderly rearrangement of dislocations at grain boundaries are the primary factors contributing to the comprehensive improvement in the mechanical properties and consistency of TC11 Titanium alloy.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"128 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930495","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}
Pub Date : 2024-08-02DOI: 10.1016/j.jmrt.2024.07.235
Wonjoo Lee, Yong-Taek Hyun, Jong Woo Won, Jonghun Yoon
This paper considers the beta/alpha transformation of Ti–6Al–4V alloy using a lattice Boltzmann method (LBM) – cellular automata (CA) coupled method in terms of microstructural evolution during phase transformation. Particularly, the effects of the cooling rate on microstructures such as beta grain size, alpha colony size, and alpha lath thickness were examined as well as the overall morphologies. The LBM and CA were used to implement the diffusion of alloy components and phase transformation, respectively. Additionally, the thermodynamic and kinetic data for simulating the ternary alloy system were obtained from CALPHAD software to utilize the equilibrium phase diagram calculations. The initial states of the beta grain and its composition fields affect the processing of beta/alpha phase transformation and the final alpha + beta phase morphologies. Validation of the proposed method was conducted to compare the simulation results with experimental trends for microstructures of Ti–6Al–4V from the literature. The error in prediction of microstructural morphologies were 20% in the average alpha thickness with deviation of up to 5 μm.
{"title":"Numerical simulation for β/α transformation of Ti–6Al–4V alloy using a lattice Boltzmann - Cellular automata method","authors":"Wonjoo Lee, Yong-Taek Hyun, Jong Woo Won, Jonghun Yoon","doi":"10.1016/j.jmrt.2024.07.235","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.235","url":null,"abstract":"This paper considers the beta/alpha transformation of Ti–6Al–4V alloy using a lattice Boltzmann method (LBM) – cellular automata (CA) coupled method in terms of microstructural evolution during phase transformation. Particularly, the effects of the cooling rate on microstructures such as beta grain size, alpha colony size, and alpha lath thickness were examined as well as the overall morphologies. The LBM and CA were used to implement the diffusion of alloy components and phase transformation, respectively. Additionally, the thermodynamic and kinetic data for simulating the ternary alloy system were obtained from CALPHAD software to utilize the equilibrium phase diagram calculations. The initial states of the beta grain and its composition fields affect the processing of beta/alpha phase transformation and the final alpha + beta phase morphologies. Validation of the proposed method was conducted to compare the simulation results with experimental trends for microstructures of Ti–6Al–4V from the literature. The error in prediction of microstructural morphologies were 20% in the average alpha thickness with deviation of up to 5 μm.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930372","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}
Pub Date : 2024-08-02DOI: 10.1016/j.jmrt.2024.07.232
Zhengyi Li, Yibo Ai, Lei Wen, Hongying Yu, Weidong Zhang, Dongbai Sun
To enhance the tribocorrosion resistance of 7075-T6 aluminum alloy in deep sea environments, TiB–Ni coatings with varying LaO content were deposited on 7075-T6 aluminum alloy substrates using plasma spray technology. The effects of different LaO contents on the organization, structure, and properties of the coatings were analyzed. The results indicated that LaO incorporation suppressed brittle phase formation such as NiB; 1.0 wt% LaO addition reduced NiB by 16.9%. The coating's corrosion resistance significantly improved with LaO doping - the self-corrosion current density of the 1.0 wt% LaO-doped coating decreased from 71.2 nA/cm to 30.2 nA/cm.
{"title":"Influence of added La2O3 on the microstructure, mechanical properties, and tribocorrosion resistance of TiB2–Ni plasma-sprayed coatings","authors":"Zhengyi Li, Yibo Ai, Lei Wen, Hongying Yu, Weidong Zhang, Dongbai Sun","doi":"10.1016/j.jmrt.2024.07.232","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.232","url":null,"abstract":"To enhance the tribocorrosion resistance of 7075-T6 aluminum alloy in deep sea environments, TiB–Ni coatings with varying LaO content were deposited on 7075-T6 aluminum alloy substrates using plasma spray technology. The effects of different LaO contents on the organization, structure, and properties of the coatings were analyzed. The results indicated that LaO incorporation suppressed brittle phase formation such as NiB; 1.0 wt% LaO addition reduced NiB by 16.9%. The coating's corrosion resistance significantly improved with LaO doping - the self-corrosion current density of the 1.0 wt% LaO-doped coating decreased from 71.2 nA/cm to 30.2 nA/cm.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930373","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}
Pub Date : 2024-08-02DOI: 10.1016/j.jmrt.2024.07.233
Jungwoong Kim, Hyung-Jun Cho, Sung-Joon Kim
The effects of austenitizing temperature and cooling rate on microstructure and subsequent tensile properties were investigated in 0.15C–5Mn martensitic steels. Tensile strength and elongation increased with decreasing austenitizing temperature (1000 °C to 800 °C) in both air-cooled and water-quenched steels. Improvement of tensile properties originated from the promoted transformation-induced plasticity (TRIP) effect, as lower austenitizing temperature limited Mn diffusion to make cementite preferred site for Mn partitioning, thereby increasing the fraction of retained austenite after heat treatment. Cooling rate also affected the mechanical properties, as air-cooled samples showed lower strength and higher elongation compared to water-quenched samples. During the air-cooling, supersaturated carbon in martensite is redistributed to form additional carbides by auto-tempering effect. The formation of carbides softened the martensite to decrease strength while increased tensile elongation. Fraction of retained austenite influenced by the austenitizing temperature and formation of carbide affected by the cooling rate acted as competing mechanisms affecting the tensile properties of the martensitic steels, indicating that heat treatment should be controlled carefully to obtain the desirable mechanical properties.
{"title":"Role of cementite on tensile properties in auto-tempered 0.15C–5Mn martensitic steel","authors":"Jungwoong Kim, Hyung-Jun Cho, Sung-Joon Kim","doi":"10.1016/j.jmrt.2024.07.233","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.233","url":null,"abstract":"The effects of austenitizing temperature and cooling rate on microstructure and subsequent tensile properties were investigated in 0.15C–5Mn martensitic steels. Tensile strength and elongation increased with decreasing austenitizing temperature (1000 °C to 800 °C) in both air-cooled and water-quenched steels. Improvement of tensile properties originated from the promoted transformation-induced plasticity (TRIP) effect, as lower austenitizing temperature limited Mn diffusion to make cementite preferred site for Mn partitioning, thereby increasing the fraction of retained austenite after heat treatment. Cooling rate also affected the mechanical properties, as air-cooled samples showed lower strength and higher elongation compared to water-quenched samples. During the air-cooling, supersaturated carbon in martensite is redistributed to form additional carbides by auto-tempering effect. The formation of carbides softened the martensite to decrease strength while increased tensile elongation. Fraction of retained austenite influenced by the austenitizing temperature and formation of carbide affected by the cooling rate acted as competing mechanisms affecting the tensile properties of the martensitic steels, indicating that heat treatment should be controlled carefully to obtain the desirable mechanical properties.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930635","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}
Pub Date : 2024-08-02DOI: 10.1016/j.jmrt.2024.07.236
Jiachen Zhou, Baoxian Su, Binbin Wang, Liangshun Luo, Tong Liu, Yanan Wang, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu
In general, the Ti–6.5Al–2Zr–1Mo–1V (TA15) components fabricated via laser powder bed fusion (L-PBF) exhibit high strength and low ductility. Herein, we report a novel approach to enhance the comprehensive mechanical properties of L-PBF TA15 alloy by adjusting the laser power. Samples processed using the optimal laser power exhibit a grid structure of alternating wide and narrow prior-β grains (PBGs), the inside of which is composed of a fully martensitic microstructure. The paper discusses in detail the alterations in the microstructure of samples processed at both low and high laser powers, clarifying the relationship between microstructure and mechanical properties. Thinner martensite contributes to higher strength, while a homogenous microstructure improves ductility. These findings provide valuable insights for controlling microstructure and achieving strength-ductility synergy in L-PBF additive manufacturing of titanium alloys.
{"title":"Achieving strength-ductility synergy of laser powder bed fusion Ti–6.5Al–2Zr–1Mo–1V alloy by regulating laser power","authors":"Jiachen Zhou, Baoxian Su, Binbin Wang, Liangshun Luo, Tong Liu, Yanan Wang, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu","doi":"10.1016/j.jmrt.2024.07.236","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.236","url":null,"abstract":"In general, the Ti–6.5Al–2Zr–1Mo–1V (TA15) components fabricated via laser powder bed fusion (L-PBF) exhibit high strength and low ductility. Herein, we report a novel approach to enhance the comprehensive mechanical properties of L-PBF TA15 alloy by adjusting the laser power. Samples processed using the optimal laser power exhibit a grid structure of alternating wide and narrow prior-β grains (PBGs), the inside of which is composed of a fully martensitic microstructure. The paper discusses in detail the alterations in the microstructure of samples processed at both low and high laser powers, clarifying the relationship between microstructure and mechanical properties. Thinner martensite contributes to higher strength, while a homogenous microstructure improves ductility. These findings provide valuable insights for controlling microstructure and achieving strength-ductility synergy in L-PBF additive manufacturing of titanium alloys.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930371","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}
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