Journal of Materials Research and Technology-Jmr&t最新文献

{"title":"Evolution mechanisms of the scratch-induced elastoplastic stress fields and crack damage in γ-TiAl alloys","authors":"Zhaoqing Zhang ,&nbsp;Kaining Shi ,&nbsp;Yaoyao Shi ,&nbsp;Huhu Li ,&nbsp;Danni Lu ,&nbsp;Yujie Kuang ,&nbsp;Jiacheng Liu","doi":"10.1016/j.jmrt.2024.12.075","DOIUrl":"10.1016/j.jmrt.2024.12.075","url":null,"abstract":"<div><div>γ-TiAl alloys are extensively utilized in aero-engine turbine blades due to their exceptional physical and mechanical properties. However, the damage mechanisms during the machining of γ-TiAl alloys remain unclear, primarily due to the complexities in analyzing stress distribution and damage evolution during machining. Therefore, investigating the damage mechanisms of machining-induced, particularly the initiation and evolution of such damage, is critically important for achieving efficient and low-damage processing. In this study, scratch experiments were conducted to simulate the material removal process during grinding. The discrete wavelet transform (DWT) was applied to analyze load signals during the scratching process, enabling the precise identification of the plastic-to-brittle transition domain and the critical cutting depth for γ-TiAl alloys, and clarifying the damage mechanisms under different cutting depths. Furthermore, an analytical model of the elastoplastic stress field was established, and a system model of the crack initiation and propagation was developed by systematically analyzing the influence of the elastoplastic stress field on crack damage evolution. Detailed quantitative and visual analyses of the stress field variations, surface morphology characteristics, and crack propagation paths at the surface, shallow, and deeper layers revealed that the elastoplastic stress field model accurately reflects the stress field evolution during the scratching process of γ-TiAl alloys, and the mechanisms of crack initiation and propagation at both the surface and subsurface was elucidated and verified. These findings provide a robust theoretical foundation for the efficient and low-damage machining of γ-TiAl alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 932-945"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights on the use of genetic algorithm to tessellate voronoi structures in materials science","authors":"Luana Souza Almeida ,&nbsp;Paulo Rangel Rios","doi":"10.1016/j.jmrt.2024.12.063","DOIUrl":"10.1016/j.jmrt.2024.12.063","url":null,"abstract":"<div><div>The advances in manufacturing technologies have enabled the production of Voronoi structures. The main advantage of these complex designs is their lightweight and enhanced mechanical properties, such as high buckling resistance. Some applications of Voronoi structures are in reducing the weight of automotive and aerospace parts and developing biomedical implants. Metaheuristics are being used to optimize these structures while improving their mechanical properties. Hence, in this study, a systematic review is conducted to identify the trends and gaps in the use of the Genetic Algorithm to optimize two and three-dimensional Voronoi structures. The results mapped seven application domains and suggest that future research should combine manufacturability and optimization constraints, such as additive manufacturing restrictions. In addition, alternative materials (e.g., ceramics and metals) could be used to create specimens for the mechanical tests, and other approaches to finite element simulation are required to speed up the optimization process. The quantitative analysis suggests that this is an emerging topic, with few researchers in local groups cooperating to develop the field.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 449-462"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the microstructure and corrosion behavior of Fe-28.5Ni steel subjected to severe plastic deformation","authors":"Melika Jalali ,&nbsp;Hamid Reza Jafarian ,&nbsp;Ali Shanaghi ,&nbsp;Ali Reza Eivani","doi":"10.1016/j.jmrt.2024.12.036","DOIUrl":"10.1016/j.jmrt.2024.12.036","url":null,"abstract":"<div><div>This study investigates the influence of the Accumulative Roll-Bonding (ARB) process on the corrosion behavior of Fe-28.5Ni alloys. The research examines how the ARB as a severe plastic deformation technique alters the microstructure and corrosion resistance of this alloy. Specimens subjected to different ARB cycles were analyzed using electrochemical impedance spectroscopy, cyclic potentiodynamic polarization, and open-circuit potential measurements in 1 M HCl solution. Results indicate that increasing the number of ARB cycles initially decreases corrosion resistance due to higher dislocation densities. However, after four cycles, the formation of low-angle grain boundaries enhances corrosion resistance by creating a more uniform surface energy distribution and stable corrosion product layers. Optimal corrosion resistance was observed at six ARB cycles, beyond which high-angle grain boundaries began to diminish the protective effects. This study underscores the significance of optimizing ARB parameters to improve the performance of Fe–Ni alloys in corrosive environments.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 90-99"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of segregation on hot deformation behavior of GCr15 bearing steel in continuous casting","authors":"Mingyang Liu ,&nbsp;Tianyu Zhang ,&nbsp;Chenchong Wang ,&nbsp;Ye Liu ,&nbsp;Junyang Qian ,&nbsp;Hongshuang Di ,&nbsp;Qing Yin ,&nbsp;Chi Zhang","doi":"10.1016/j.jmrt.2024.12.046","DOIUrl":"10.1016/j.jmrt.2024.12.046","url":null,"abstract":"<div><div>GCr15 steel, renowned as one of the most extensively utilized metallic materials in bearing applications, has been the subject of considerable research, particularly regarding its hot deformation behavior. However, the effect of macro- and micro-segregation on the hot deformation behavior of GCr15 steel remains underexplored. In this study, a comprehensive investigation was conducted to systematically assess the hot deformation behavior of continuously cast GCr15 steel under varying degrees of macro- and micro-segregation through hot compression testing. Flow curves were utilized to construct hot processing maps, enabling a detailed analysis of the effects of segregation on hot workability. The findings reveal that, at a deformation temperature of 800 °C and a strain rate of 10 s⁻¹, the negatively segregated regions of GCr15 steel exhibit a greater propensity for instability during hot working than their positively segregated counterparts. This heightened instability, which accelerates with increasing true strain, can be attributed to stress concentrations arising from inhomogeneities inherent to the continuous casting process. Additionally, the negative macro-segregation zone demonstrated superior hot workability, attributed to its lower hardness. Based on these observations, the optimal hot processing conditions were identified as a deformation temperature of 1000 °C and a strain rate of 0.1 s⁻¹.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 48-57"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Models for plastic flow: People, places, concepts and techniques","authors":"Mike Ashby","doi":"10.1016/j.jmrt.2024.11.275","DOIUrl":"10.1016/j.jmrt.2024.11.275","url":null,"abstract":"<div><div>Fred Kocks' professional life spanned a period of intense development in the understanding of the micromechanics of plastic flow. Continuum plasticity theory and the concepts of crystal plasticity with defined slip planes and directions were well established in 1959 when Fred graduated from the University of Göttingen. The concept of dislocations, discrete carriers of deformation, and their interactions, had initiated a wave of activity across Europe and the US, offering the potential for micro-mechanical models for plastic flow and its dependence on composition, temperature, time (strain-rate) and prior mechanical history. Fred became one of the principal players in the field, starting with his 1958 study of the deformation of polycrystals [1]. To understand his approach and his subsequent contributions it helps to have a picture of the intellectual climate of Göttingen and the excitement of generated by dislocation-plasticity at that time. This brief paper describes this context in which Fred's work should be viewed.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 32-34"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the corrosion behavior of cast Ti2AlNb alloy in HF–HNO3 solution","authors":"Yunyun Liu ,&nbsp;Xianfei Ding ,&nbsp;Lihong Wu ,&nbsp;Xin Feng ,&nbsp;Jiabin Zuo ,&nbsp;Yunan Zhang ,&nbsp;Lei Wen","doi":"10.1016/j.jmrt.2024.12.031","DOIUrl":"10.1016/j.jmrt.2024.12.031","url":null,"abstract":"<div><div>Based on immersion weight loss and electrochemical methods, the corrosion behavior of cast Ti₂AlNb alloy in HF–HNO₃ solution was investigated. The corrosion effects of HF and HNO₃ on Ti₂AlNb alloy were elucidated by examining the impact of varying concentrations of HF and HNO₃ in mixed pickling solution on corrosion rate and surface roughness, as well as comparing and analyzing changes in macroscopic surfaces, microscopic morphology, and three-dimensional morphology before and after pickling. The electrochemical behavior of Ti₂AlNb alloys in different concentrations of HF and HNO₃ solutions was revealed by measuring the OCP-time and polarization curves of Ti₂AlNb alloys in HF–HNO₃ mixed pickling solutions. The experimental results indicated that the corrosion rate of Ti₂AlNb alloy increased linearly with the increasing concentrations of HF and HNO_3. Surface roughness increases with higher HF content, but decreases with higher HNO₃ content after reaching a certain maximum value. The high concentrations of HNO₃ exert a pronounced passivation effect, which results in a reduction of surface roughness. However, it also has the tendency to produce pitting corrosion in coarse O/α₂ phases at grain boundaries and within the grain. Scanning Kelvin probe atomic force microscopy (SKPFM) combined with microstructural analysis revealed that the electrochemical system consisting of matrix B2 phase and secondary phase governs the high localized dissolution rate of Ti₂AlNb alloy. Additionally, the segregation of elements at grain boundaries accelerates corrosion, leading to more severe degradation in those regions. This study provides an experimental basis for understanding the corrosion behavior of Ti₂AlNb alloy in HF–HNO₃ solution.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 372-383"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and characterization of polyester/ramie fiber hybrid composites reinforced with crystalline nanocellulose extracted from durian peel waste","authors":"Henny Pratiwi ,&nbsp;Kusmono ,&nbsp;Muhammad Waziz Wildan","doi":"10.1016/j.jmrt.2024.12.159","DOIUrl":"10.1016/j.jmrt.2024.12.159","url":null,"abstract":"<div><div>Using natural fibers and natural fillers as composite reinforcing materials has received great attention due to its potential to improve mechanical, thermal, biodegradable, and tribological properties while promoting sustainability. The present paper investigated unidirectional ramie fiber-reinforced polyester composites treated with alkali and oxalic acid and incorporating cellulose nanocrystals (CNCs) to assess their performance. Hybrid composites were created by adding 0.5, 0.75, and 1 wt% CNCs to polyester/ramie composites using the vacuum infusion technique. Mechanical and thermal tests and morphological examination were carried out to assess the influence of CNCs content on the composite properties. The results demonstrated that the presence of CNCs notably improved the mechanical performances of the polyester/ramie fiber composites. The optimal CNCs loading was attained at 0.75 wt% where the tensile strength, tensile modulus, flexural strength, flexural modulus, interlaminar shear strength, and impact strength of the polyester/ramie fiber composites were enhanced by 27.23, 33.12, 39.41, 84.56, 31.91, and 49.53%, respectively. This was confirmed by FE-SEM observations of hybrid composites, which showed good interfacial adhesion between ramie fiber and polyester/CNCs matrix. The addition of CNCs was found not to affect the thermal characteristics of the hybrid composites. Overall, polyester/ramie fiber hybrid composites containing CNCs provided great potential for structural applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 1201-1212"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of process parameters on the microstructure and properties of the TiC/Ti-alloy composites fabricated by the directed energy deposition process","authors":"Yongxia Wang ,&nbsp;Wei Fan ,&nbsp;Fan Zhou ,&nbsp;Konda Gokuldoss Prashanth ,&nbsp;Zhe Feng ,&nbsp;Siyu Zhang ,&nbsp;Hua Tan ,&nbsp;Xin Lin","doi":"10.1016/j.jmrt.2024.12.043","DOIUrl":"10.1016/j.jmrt.2024.12.043","url":null,"abstract":"<div><div>In titanium matrix composites, the size and distribution of the reinforcing particles significantly impact their mechanical properties. Accordingly, in this work, TiC-reinforced Ti-alloy matrix composites were fabricated using the directed energy deposition (DED) technology. The influence of the varying process parameters on the microstructure and properties of the TiC-reinforcing particles and the α phase in the matrix was elucidated. The results revealed that process parameters had a notable influence on the morphology and distribution of the TiC reinforcing particles as well as the morphology of the α phase. A reduction in the pulse current and increasing scanning speed led to a significant decrease in the size of TiC reinforcing particles but offered uniform distribution. Concurrently, the morphology of the α phase changes from coarse lath-like to slender lath-like to irregular block-like. The combination of the TiC particles and the α phase with distinct characteristics resulted in significant variations in the room-temperature tensile properties of the TiC/Ti-alloy composites. The tensile strength of the TiC/Ti-alloy composites exhibiting optimal performance in this work reached 1412 MPa, which is ∼28% higher than that of the forged Ti-alloy matrix (1100 MPa). This research offers the groundwork for a substantial enhancement in the overall properties of titanium matrix composites.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 164-174"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and fabrication of {111}-textured nanotwinned silver coating for enhancing surface wear resistance of depleted uranium","authors":"Kunming Yang ,&nbsp;Xiaobo Wang ,&nbsp;Shengfa Zhu ,&nbsp;Yawen Zhao ,&nbsp;Qingdong Xu ,&nbsp;Yiyun Wei ,&nbsp;Chao Lu ,&nbsp;Zhiyuan Wen ,&nbsp;Tongxiang Fan ,&nbsp;Mingyu Gong ,&nbsp;Anyi Yin ,&nbsp;Wenhua Luo","doi":"10.1016/j.jmrt.2024.12.051","DOIUrl":"10.1016/j.jmrt.2024.12.051","url":null,"abstract":"<div><div>Enhancing surface wear resistance is critical for uranium (U) and its alloys to retard degradation of their mechanical and physical properties. Deposited nanotwinned (NT) silver (Ag), which is relatively “soft” in-plane and “hard” out-of-plane with respect to surface, may serve as wear-resistant coating. In this work, first-principles density functional theory (DFT) calculations were performed to reveal the energetics of possible Ag/α-U interfaces. Meanwhile, molecular statics (MS) and molecular dynamics (MD) simulations were carried out to understand the behaviors of Ag adatoms and the tribological performance of subsequent different textured Ag. The {<span><math><mrow><mn>111</mn></mrow></math></span>}_Ag-textured coating with fine twins with small plastic zone, low delamination height and subsequent minimal coefficient of friction (COF) was designed. Furthermore, by controlling the bias voltage of magnetron sputtering from −100 to −800 V, Ag coatings with various surface roughness, grain size, and nanoscale twin density were experimentally deposited on depleted uranium (DU) for tribological performance studies. Microstructural characterizations showed that at the optimized bias voltage of −400 V, the sputter-deposited Ag coating exhibited {111}-oriented texture with high-density nanoscale twins and also well-bonded Ag/DU interface with an UO₂ interlayer, thus endowing the Ag coating highly stable wear resistance with low mass wear rate of ∼1.37 × 10⁻⁷ g/(N·s). The present findings may shed lights on microstructural and interface design of surface anti-wear coatings on U and its alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 195-208"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macroscopic and microscopic characteristics of nanosilica sol-based composite grout in sealing fractured argillaceous rock: A comparative study with silica sol and cement slurry","authors":"Zhe Xiang ,&nbsp;Nong Zhang ,&nbsp;Dongjiang Pan ,&nbsp;Zhengzheng Xie ,&nbsp;Peng Wang ,&nbsp;Dongxu Liang","doi":"10.1016/j.jmrt.2024.12.128","DOIUrl":"10.1016/j.jmrt.2024.12.128","url":null,"abstract":"<div><div>Argillaceous surrounding rock is prone to weakening when exposed to water, which can cause significant long-term deformations and instability in roadways. This paper focuses on a high-injectability, high-strength nanosilica sol-based composite grout, characterizing its sealing patterns at both the macroscopic and microscopic levels within multilevel porous argillaceous rock bodies. It also explores the microscopic structural interactions at the grout-rock interface. Additionally, the paper compares the performance of this composite grout with traditional silica sol and cement grout, providing initial insights into the anti-seepage reinforcement mechanism of the composite grout when used in grouting argillaceous soft rock. The research results show that, for composite grouting (1) The porosity and sealing of the grout-rock cementitious body decrease with increasing particle size of the rock blocks, with a minimum permeability coefficient of 2.34 × 10⁻⁸ cm/s; (2) The presence and distribution pattern of multi-level pores of grout in rock fractures can be evaluated using the T2 spectrum of nuclear magnetic resonance (NMR). The pore volume of the cementitious body is mainly provided by large pores &lt;100 ms, and the composite grout has a good sealing effect on the matrix system of the argillaceous rock. (3) There is a dense transition area at the grout-rock interface, formed by the accumulation of nano-materials such as aluminate cement hydration-formed aluminate gel and silica sol. On the grout-rock interface, aluminate gel nucleates on nano-SiO₂, continuously precipitating, aggregating, and cross-linking on the surface of silica particles to form a dense gel, filling the cavities at the grout-rock interface and increasing structural density. The research findings aim to provide theoretical support and experimental research basis for the practical application of composite grout in anti-seepage reinforcement engineering of argillaceous soft rock at the site.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"34 ","pages":"Pages 898-911"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}