Journal of Materials Research and Technology-Jmr&t最新文献_第9页

High-temperature tensile properties of friction stir processed AA2024 aluminum alloy under varying in situ cooling conditions

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.008

Esmat Behtaripour , Hamid Reza Jafarian , Seyed Hossein Seyedein , Nokeun Park , Ali Reza Eivani

{"title":"High-temperature tensile properties of friction stir processed AA2024 aluminum alloy under varying in situ cooling conditions","authors":"Esmat Behtaripour , Hamid Reza Jafarian , Seyed Hossein Seyedein , Nokeun Park , Ali Reza Eivani","doi":"10.1016/j.jmrt.2025.01.008","DOIUrl":"10.1016/j.jmrt.2025.01.008","url":null,"abstract":"<div><div>The study investigates the impact of in-situ cooling conditions and friction stir processing (FSP) on the high-temperature tensile properties of AA2024 alloy under various cooling conditions and regulated parameters. The tensile tests were done at strain rates of 0.0003–0.03 s<sup>−1</sup> and temperatures ranging from room temperature to 400 °C. The study found that the FSP procedure and cooling environment significantly affect the mechanical characteristics of samples at high temperatures. Under all cooling conditions, yield and ultimate strength generally decreased with increasing deformation temperature. It was found that at 325 °C with air cooling at a strain rate of 3 × 10<sup>−2</sup> s<sup>−1</sup>, the highest yield and ultimate strengths were achieved (280 MPa and 354.9 MPa, respectively). Additionally, compared to the base sample, the FSP-treated samples showed an increase in elongation at 325 and 400 °C temperatures. In FSP samples, increasing the strain rate also increased the yield strength and ultimate strength. Also, in all three strain rates in all three cooling conditions, the total elongation has increased compared to the base metal. Overall, the results of this research demonstrate that it is feasible to give aluminum alloy 2024 the required mechanical qualities at high temperatures by selecting the right FSP and cooling process parameters.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 140-151"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104610","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}

引用次数: 0

Graphene oxide and silver effects on the arc erosion properties of Al2O3–Cu/30Cr composite

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.007

Qiujie Liu , Meng Zhou , Baohong Tian , Yi Zhang , Qimeng Zhang , Jiacan Zhang , Zhiyu Han , Chunhe Chu , Ke Jing , Xu Li , Huiwen Guo , Alex A. Volinsky

{"title":"Graphene oxide and silver effects on the arc erosion properties of Al2O3–Cu/30Cr composite","authors":"Qiujie Liu , Meng Zhou , Baohong Tian , Yi Zhang , Qimeng Zhang , Jiacan Zhang , Zhiyu Han , Chunhe Chu , Ke Jing , Xu Li , Huiwen Guo , Alex A. Volinsky","doi":"10.1016/j.jmrt.2025.01.007","DOIUrl":"10.1016/j.jmrt.2025.01.007","url":null,"abstract":"<div><div>To investigate methods for enhancing the resistance of electrical contact materials to arc erosion, this study focuses on the preparation and properties of novel composites. Al<sub>2</sub>O<sub>3</sub>–Cu/30Cr and 0.3GO-0.3Ag/Al<sub>2</sub>O<sub>3</sub>–Cu/30Cr composites were fabricated using vacuum hot press sintering. The composites achieved high relative densities (99.82% and 99.6%), good electrical conductivities (47.8% IACS and 46.1% IACS), excellent hardness (142 HV and 158 HV), and superior thermal conductivities (124 W/(m·K) and 188 W/(m·K) at 150 °C), with compressive strengths of 693 MPa and 711 MPa. In addition, the addition of GO-Ag improved the resistance of the material to arc erosion, and the transfer and loss of the material were significantly reduced. Under the 30 V DC 30 A condition, the anode mass gain, cathode mass reduction and total mass loss decreasing from 3 mg, 3.73 mg, and 0.73 mg–1.97 mg, 2.30 mg, and 0.33 mg, respectively. Furthermore, the transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) results show that Cr<sub>3</sub>C<sub>2</sub> compounds effectively pin the Cr–Cu interface. High thermal conductivity and good micro-interface improve the electrical contact properties of the composites and help to improve the compression properties.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 235-249"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172268","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}

引用次数: 0

Effect of electrical pulse treatment on the microstructural and mechanical responses of heterogeneous linear friction welded TC17/TC4 dissimilar joint

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.011

Xin Zhang , Kaiqun Xue , Leichang Liu , Jinsong Xiao , Jiatao Liu , Feng Jin , Ming Luo , Mei Zhan , Hongwei Li

{"title":"Effect of electrical pulse treatment on the microstructural and mechanical responses of heterogeneous linear friction welded TC17/TC4 dissimilar joint","authors":"Xin Zhang , Kaiqun Xue , Leichang Liu , Jinsong Xiao , Jiatao Liu , Feng Jin , Ming Luo , Mei Zhan , Hongwei Li","doi":"10.1016/j.jmrt.2025.01.011","DOIUrl":"10.1016/j.jmrt.2025.01.011","url":null,"abstract":"<div><div>The heterogeneous microstructure of TC17/TC4 joint manufactured by linear friction welding will reduce the mechanical properties compared with the base metals, of which the strength and ductility are hard to be improved simultaneously by traditional aging heat treatment (AHT), seriously limiting the application of LFW in the manufacturing of TC17/TC4 blisks. To this end, the present work proposes to use electric pulse treatment (EPT) to enhance the strength and ductility of the joint simultaneously by improving its microstructure. The results show that EPT effectively improves the plasticity of the joint compared with AHT. The tensile properties of aging treated joint are similar to that of the as welded joint, which present a strength around ∼805 MPa and an elongation around ∼13%. When the joint was electric pulse treated at 550 °C and 630 °C for 1 h, the elongation increases to 15.8% and 16.3%, which is an increase of 21.5% and 34.7% compared to the corresponding heat-treated joint. The microstructural response under AHT is the aging precipitation behavior of lamellar α affected by welding process. Whereas, the microstructural response under electric pulse treatment is driven by local Joule heating effect and the electron wind effect. After EPT, the basket-weave distribution of α-lamellae on TC17 side enhances ductility while maintaining strength and the spheroidized α phase on TC4 side reduces the microstructural gradient and prevents stress concentration at locations of microstructural discontinuities, thereby improving ductility. This study offers valuable insights for improving the strength and ductility of LFW TC17/TC4 blisks and advancing the application of LFW in aeroengine components.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 1-12"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104283","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}

引用次数: 0

Behavior of tellurium during vacuum thermal decomposition of Ag–Cu–Te alloy

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.013

Jia Deng , Hongjun Ding , Huan Luo , Xianjun Lei , Baoqiang Xu , Bin Yang

{"title":"Behavior of tellurium during vacuum thermal decomposition of Ag–Cu–Te alloy","authors":"Jia Deng , Hongjun Ding , Huan Luo , Xianjun Lei , Baoqiang Xu , Bin Yang","doi":"10.1016/j.jmrt.2025.01.013","DOIUrl":"10.1016/j.jmrt.2025.01.013","url":null,"abstract":"<div><div>Ag–Cu–Te alloy is inevitable to be produced in the process from lead-copper anode slime to extract precious metals. It has been prone to the situation where tellurium would deposit on the cathode and affect the quality of silver powders. Currently, the main processes of separating tellurium from Ag–Cu–Te alloy are through oxidation slagging or increasing the current density and pole spacing in the electrolysis, but these processes are long durations and high costs. This paper presents a green and efficient strategy for separating tellurium from Ag–Cu–Te alloy by vacuum thermal decomposition. The microscopic interactive mechanism between Ag, Cu, Te was explained by molecular dynamics calculations. The results demonstrate that the stability of Ag<sub>2</sub>Te structure is higher than that of Cu<sub>2</sub>Te structure, and tellurium in Cu<sub>2</sub>Te is easier to separate. The experimental results show the volatilization of tellurium reached 99.93% at 1523 K, 10 Pa, and 480 min holding time, and the content of tellurium in the residue was only 0.0045 wt%. This method will effectively remove tellurium from Ag–Cu–Te alloy and provide some ideas for the separation and recovery of precious metals.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 1030-1039"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103945","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}

引用次数: 0

Influence of ultrasonic surface rolling process on the microstructure and rotating-bending fatigue properties of 7075-T6 aluminum alloys

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.009

Xiaohui Liu , Tianjian Yu , Shuaixing Wang , Shujing Liu , Chaojun Xu , Nan Du

{"title":"Influence of ultrasonic surface rolling process on the microstructure and rotating-bending fatigue properties of 7075-T6 aluminum alloys","authors":"Xiaohui Liu , Tianjian Yu , Shuaixing Wang , Shujing Liu , Chaojun Xu , Nan Du","doi":"10.1016/j.jmrt.2025.01.009","DOIUrl":"10.1016/j.jmrt.2025.01.009","url":null,"abstract":"<div><div>Ultrasonic surface rolling process (USRP) has attracted significant attention in metal surface strengthening due to its ability to tailor microstructural features and enhance mechanical properties. However, its effects on aluminum alloys remain insufficiently understood. This study aims to produce 7075-T6 aluminum alloys with varying surface conditions by adjusting the static pressure during USRP. The influence of gradient hardness and residual stress on rotating-bending fatigue properties was investigated. The results reveal that USRP induces surface gradient layers characterized by work hardening, compressive residual stress, and a high density of dislocations. At a static pressure of 200 N, the surface hardness and residual compressive stress reach 167 HV and 560 MPa, respectively. Enhanced surface hardness inhibits fatigue crack initiation, while compressive residual stress and dislocation density delay crack propagation. Consequently, the fatigue life of the USRP-200 N sample reaches 7.9 × 10<sup>6</sup> cycles under 300 MPa, approximately 100 times longer than that of the untreated alloy.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 185-192"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104608","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}

引用次数: 0

Direct quenching and double tempering obtain high strength and toughness of Cu-bearing HSLC martensitic steel

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.006

Xingyu Zhao , Xiaoxin Zhang , Junquan Zhou , Yingxue Chen , Feifei Zhang , Jun Zhang , Qingzhi Yan

{"title":"Direct quenching and double tempering obtain high strength and toughness of Cu-bearing HSLC martensitic steel","authors":"Xingyu Zhao , Xiaoxin Zhang , Junquan Zhou , Yingxue Chen , Feifei Zhang , Jun Zhang , Qingzhi Yan","doi":"10.1016/j.jmrt.2025.01.006","DOIUrl":"10.1016/j.jmrt.2025.01.006","url":null,"abstract":"<div><div>Cu-bearing high strength low carbon (HSLC) steel possesses high strength due to the existence of finely dispersed Cu-rich phases within the matrix. However, such high precipitation strengthening results in the loss of toughness. To break this strength-toughness trade-off, we propose a new strategy of direct quenching followed by double tempering (DQ-TT). Over four times higher energy was found in the DQ-TT sample (74 J) at −84<sup>o</sup>C compared to the other samples with single tempering (DQ-T, 13 J) and reheated quenching (RQ-TT, 6 J) without the sacrifice of strength. This high toughness is proved to be derived from: the higher cleavage fracture stress (<span><math><mrow><msub><mi>σ</mi><mi>F</mi></msub></mrow></math></span>) and the higher crack initiation and propagation energy. The former comes from the refined effective grain sizes (EGS, 5.66 μm) and the optimized element segregation, where Cu (low enrichment ratio of 2.75) and Mo (high enrichment ratio of 35.20). The reduced segregation of Cu and the enrichment of Mo at the lath boundaries can effectively enhance the interfacial bonding strength. The latter is related to the orientations of the materials. It is measured that the DQ-TT sample has higher <110>//RD (47.8%) and <001>//ND (20.5%) deformation textures, which correspond to the {001} cleavage plane parallel to the RD and {110} slip plane parallel to the ND. The weak {001}//RD and strong {110}//ND ensure crack initiation and propagation along weak interfaces while preventing significant cleavage fracture. Oscilloscope impact tests reveal that DQ-TT process possesses higher crack initiation and propagation energy, which are 20 J and 37 J, respectively.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 13-24"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104282","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}

引用次数: 0

Unveiling the correlation between oxidation and magnetic properties in dual-phase FeNiBCu nanocrystalline alloys

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-04 DOI: 10.1016/j.jmrt.2025.01.010

Long Hou , Wenjun Liu , Mengen Shi , Benjun Wang , Quanhe Bao , Cong Liu , Hanchen Feng , Qizhong Shang , Weihuo Li , Zhineng Xie

{"title":"Unveiling the correlation between oxidation and magnetic properties in dual-phase FeNiBCu nanocrystalline alloys","authors":"Long Hou , Wenjun Liu , Mengen Shi , Benjun Wang , Quanhe Bao , Cong Liu , Hanchen Feng , Qizhong Shang , Weihuo Li , Zhineng Xie","doi":"10.1016/j.jmrt.2025.01.010","DOIUrl":"10.1016/j.jmrt.2025.01.010","url":null,"abstract":"<div><div>Achieving the industrial production of high-performance nanocrystalline alloys is an active research topic in which oxidation is an inescapable and top-priority issue that needs to be addressed. In this study, we conducted a comprehensive investigation into the oxidation and crystallization behaviors of dual-phase FeNiBCu nanocrystalline alloys, as well as the mechanisms underlying the relationship between oxidation and magnetic properties. The chemical valence states and microstructures analysis, indicative of galvanic cell structures, demonstrated that the concentration and activity of Fe in nanocrystals were higher than those in the matrix, thus providing effective nucleation sites for Fe-oxides. Unique delamination morphology and inner structure distinctly regulated the magnetization-magnetic softness (<em>B</em><sub>s</sub>-<em>H</em><sub>c</sub>) tradeoff. Consequently, the alloy underwent simultaneous crystallization and oxidation, affording a high <em>B</em><sub>s</sub> of 1.70 T and a low <em>H</em><sub>c</sub> of 3.5 A/m. These results enhance our understanding of the effect of oxidation on magnetic properties and provide a theoretical reference for the industrial heat treatment of high-performance nanocrystalline alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 110-118"},"PeriodicalIF":6.2,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104613","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}

引用次数: 0

Dependency of the pulse dynamic electrochemical machining characteristics of Allvac 718 plus in NaNO3 solution on the machining paraments

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-03 DOI: 10.1016/j.jmrt.2024.12.188

Moqi Shen, Shuanglu Duan, Zhengrui Zhou, Zhichun Zhang, Jia Liu, Di Zhu

{"title":"Dependency of the pulse dynamic electrochemical machining characteristics of Allvac 718 plus in NaNO3 solution on the machining paraments","authors":"Moqi Shen, Shuanglu Duan, Zhengrui Zhou, Zhichun Zhang, Jia Liu, Di Zhu","doi":"10.1016/j.jmrt.2024.12.188","DOIUrl":"10.1016/j.jmrt.2024.12.188","url":null,"abstract":"<div><div>Pulse dynamic electrochemical machining (PDECM) is an innovative electrochemical machining technique that significantly enhances machining precision. It is considered a promising method for manufacturing the blisks of next-generation aircraft engines. Allvac 718 Plus (ATI718 Plus), a new generation nickel-based superalloy, is an essential material for these blisks due to its exceptional performance under high-temperature and high-pressure conditions. This study aims to investigate the electrochemical dissolution characteristics of ATI718 Plus under various PDECM parameters. Potentiodynamic polarization experiments revealed that ATI718 Plus exhibits a complex dissolution behavior characterized by distinct passivation and transpassivation stages. Electrochemical impedance spectroscopy (EIS) further confirmed the superior protective capabilities of the oxide film, suggesting it has a bilayer structure with an outer porous layer and an inner dense layer. X-ray photoelectron spectroscopy (XPS) analysis validated this hypothesis by accurately identifying the proportions of various metal oxides within the film. Subsequently, PDECM experiments were conducted on ATI718 Plus under different duty cycles, vibration frequencies, and applied voltages. The relationships between these processing parameters and the machining quality of ATI718 Plus were explored by examining the post-processing microstructure, surface roughness, material dissolution rate, and machining precision. Finally, an ATI718 Plus blade was machined using the optimized parameters, achieving a residual deviation of 0.065 mm and a surface roughness of 0.373 μm, meeting the design requirements of the blade.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 892-910"},"PeriodicalIF":6.2,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171564","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}

引用次数: 0

Enhanced mechanical properties of Al0.43CoCrFeNi2.1 high entropy alloy fabricated through complex shear flow casting: Experiment and MD simulation

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-02 DOI: 10.1016/j.jmrt.2024.12.228

Simeng Jiang , Yaya Zhao , Weijie Fan , Weiyang Xie , Yanlin Wang , Xiaohua Chen , Zidong Wang

{"title":"Enhanced mechanical properties of Al0.43CoCrFeNi2.1 high entropy alloy fabricated through complex shear flow casting: Experiment and MD simulation","authors":"Simeng Jiang , Yaya Zhao , Weijie Fan , Weiyang Xie , Yanlin Wang , Xiaohua Chen , Zidong Wang","doi":"10.1016/j.jmrt.2024.12.228","DOIUrl":"10.1016/j.jmrt.2024.12.228","url":null,"abstract":"<div><div>In this study, a novel preparation method for high-entropy alloys (HEAs) was developed. Al<sub>0.43</sub>CoCrFeNi<sub>2.1</sub> HEA ingots were cast under complex shear flow, while a comparison group was cast without applying shear flow. Various characterization techniques were employed to analyze the microstructural differences between the two samples. Molecular dynamics (MD) simulations were used to investigate the nucleation characteristics, microstructure evolution, and dislocation evolution during solidification. Additionally, to investigate the deformation properties and mechanical behavior of the two samples, uniaxial tension was applied to the solidified samples using MD simulations. The results reveal that by introducing severe shear flow, the equiaxed grains of the Al<sub>0.43</sub>CoCrFeNi<sub>2.1</sub> HEA alloy were refined, twins were formed, and the likelihood of dislocation ring formation and dislocation entanglement during solidification decreased. Compared to the traditional method, the sample prepared by complex shear flow casting (CSFC) exhibits yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of 330.7 MPa, 661.7 MPa, and 54.8%, respectively, showing increases of 23.1%, 26.6%, and 7.5%, respectively. The strengthening and toughening mechanisms were discussed, suggesting that the refinement of equiaxed grains, the elimination of dislocation entanglement, the twinning-induced plasticity (TWIP) effect during deformation, and the transformation-induced plasticity (TRIP) effect induced by fivefold twins contribute to the improvement of mechanical properties. The novel CFSC method holds significant potential for applications in HEAs.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 67-81"},"PeriodicalIF":6.2,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104614","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}

引用次数: 0

Mechanical, microstructural properties and ballistic performance of SiC/Si ceramics against 5.56 x 45 mm projectile

IF 6.2 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-01-02 DOI: 10.1016/j.jmrt.2025.01.003

Jeremias Ismael Nunes Fortini , Pedro Henrique Poubel Mendonça da Silveira , Sergio Neves Monteiro , Altair Sória Pereira , Eduardo Sousa Lima

{"title":"Mechanical, microstructural properties and ballistic performance of SiC/Si ceramics against 5.56 x 45 mm projectile","authors":"Jeremias Ismael Nunes Fortini , Pedro Henrique Poubel Mendonça da Silveira , Sergio Neves Monteiro , Altair Sória Pereira , Eduardo Sousa Lima","doi":"10.1016/j.jmrt.2025.01.003","DOIUrl":"10.1016/j.jmrt.2025.01.003","url":null,"abstract":"<div><div>Modern armed conflicts heavily rely on technology to ensure the safety of combatants in police operations, tactical warfare, or military engagements. The use of ceramic armor has become common to provide protection against high-caliber munitions, making it essential to optimize these materials for a combination of lightness and strength. In this context, this study justifies the use of silicon (Si) as a reinforcement in silicon carbide (SiC) to reduce the ceramics' density without compromising their mechanical properties and ballistic performance. The addition of Si allows a reduction in the density of sintered samples with 15 and 25 vol% Si, contributing to the material's lightness, a crucial factor for user mobility. The results show that despite the lower density, the hardness of SiC ceramics increased with higher Si additions, though there was a decrease in flexural strength and elastic modulus. Ballistic tests demonstrated that the produced ceramics effectively withstood the firing of 5.56 × 45 mm caliber ammunition, meeting the requirements of the new standard under development for ballistic materials, NIJ 0123.00. This research makes significant contributions to the development of advanced armor systems, enhancing combatant safety through lightweight, high-performance ballistic materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 208-219"},"PeriodicalIF":6.2,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104335","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}

引用次数: 0