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Effect of minor addition of silicon on deformation behaviour and texture evolution in CrFeNi medium entropy alloy 少量添加硅对CrFeNi中熵合金变形行为和织构演化的影响
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100133
Swati Mahato , Tirupati Dhidhi , Nilesh P. Gurao , Krishanu Biswas
The present investigation systematically explores the effect of a minor addition of silicon on the microstructure, texture, and mechanical properties of FCC CrFeNi medium entropy alloy during rolling at room temperature. The addition of 2 at% Si in CrFeNi alloy results in the reduction of stacking fault energy from 22.4 mJ/m2 for CrFeNi to 18.6 mJ/m2 for (CrFeNi)98Si2 alloy. Bulk texture analysis reveals the presence of Brass and Goss texture components in the 90 % rolled samples. Microtextural study reveals that in CrFeNi and (CrFeNi)98Si2 alloy, Goss-orientated grains exhibit greater stability throughout the deformation compared to Cu-oriented grains. In addition to twinning, profuse shear banding was observed in both alloys at 90 % rolling reduction. The mechanical properties of homogenised (CrFeNi)98Si2 alloy demonstrate the enhanced combination of yield strength and hardness due to improved solid solution strengthening and dislocation strengthening accompanied by a marginal decrease in ductility due to twinning-induced strain hardening. While in 90 % rolled CrFeNi and (CrFeNi)98Si2 alloy, both yield strength and ultimate tensile strength increase drastically due to enhanced solid solution and dislocation strengthening though with a significant decrease in ductility.
本研究系统地探讨了少量添加硅对FCC CrFeNi中熵合金室温轧制过程中组织、织构和力学性能的影响。(CrFeNi)98Si2合金的层错能从(CrFeNi)的22.4 mJ/m2降低到(CrFeNi)的18.6 mJ/m2。整体织构分析表明,在90% %的轧制样品中存在黄铜和高斯织构成分。显微组织研究表明,在CrFeNi和(CrFeNi)98Si2合金中,goss取向晶粒在整个变形过程中表现出比cu取向晶粒更大的稳定性。除了孪晶外,两种合金在90% %轧制压下均出现大量剪切带。均匀化(CrFeNi)98Si2合金的力学性能表现为屈服强度和硬度的提高,这是由于固溶强化和位错强化的改善,同时由于孪晶引起的应变硬化,塑性略有下降。而在90% %轧制的CrFeNi和(CrFeNi)98Si2合金中,屈服强度和极限抗拉强度由于固溶和位错强化的增强而显著提高,但塑性显著降低。
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引用次数: 0
Influence of heat treatment time on microstructure evolution of austempered nodular cast iron evaluated by image segmentation 图像分割法评价热处理时间对等温球铁组织演变的影响
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100135
P.A. Ramos , I.N.R. Melo , V.H.M Medeiros , P.P. Brito
This study aimed to investigate the microstructural characteristics of a pearlitic austempered nodular cast iron (ADI) prepared with different austempering times. In austempering of ductile irons, the material is austenitiezed and rapidly cooled to temperatures typically between 420 and 290°C in a salt bath to allow the formation of a microstructure composed of graphite nodules dispersed in a residual austenitic matrix, stabilized with a high carbon content, and acicular ferrite, known as “ausferrite”. Presently, microstructure characterization by optical and scanning electron microscopy were carried out after different austempering times. Neural network image segmentation using ImageJ® software was employed to perform quantitative phase analysis, and the results were compared with volume fractions obtained by XRD measurements, one of the traditional methods for determining the residual austenite content in ferrous alloys. It was found that both carbon content in austenite and austenite fraction increase with austempering time and that graphite nodule geometry becomes gradually more irregular. The proposed methodology for quantitative analysis allowed classification of microstructure constituents with high accuracy in comparison to the XRD results.
研究了不同等温时间制备的珠光体等温球墨铸铁的显微组织特征。在球墨铸铁的等温回火中,材料被奥氏体化并在盐浴中迅速冷却到420至290℃之间,以形成由分散在残余奥氏体基体中的石墨结节和针状铁素体(称为“奥氏体”)组成的微观结构。目前,采用光学显微镜和扫描电镜对不同等温时效时间的合金进行了显微组织表征。采用ImageJ®软件进行神经网络图像分割进行定量相分析,并将结果与传统的测定铁合金中残余奥氏体含量的方法之一XRD测量得到的体积分数进行比较。随着等温回火时间的延长,奥氏体中碳含量和奥氏体分数均增加,石墨球的几何形状逐渐变得不规则。与XRD结果相比,所提出的定量分析方法允许对微观结构成分进行高精度分类。
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引用次数: 0
Microstructural design opportunities and phase stability in the spray-formed AlCoCr0.75Cu0.5FeNi high entropy alloy
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100138
Vikas Shivam , Shubhada Kar , Gopi K. Mandal , N.K. Mukhopadhyay , V.C. Srivastava
Designing a microstructure with controlled morphology is one of the determining factors for the optimum performance of a material. High entropy alloys (HEAs) have gained significant attention due to their enhanced mechanical and functional properties compared to conventional alloys, particularly based on opportunities for microstructural design. In this fast-developing field, varied thermal treatments can be applied to engineer a material as per the requirements. In the present work, we have studied the effect of thermal treatment on the microstructural modifications in the spray-formed AlCoCr0.75Cu0.5FeNi HEA. The alloy was characterized by using a light microscope, scanning electron microscope equipped with EDS detector and electron probe micro analyzer (EPMA). The elemental distribution and microstructural evolution of the alloy were studied by giving the heat treatments at different time-temperature spaces. The evolution of phases and their composition were correlated with the CALPHAD predicted property diagram and phase composition. It is observed that at a higher temperature of 1300°C, the alloy shows the simple solid solution phases to be more stable due to the high entropy effect, which brings down the Gibbs free energy of the system. The formation of the disordered BCC, FCC and their derivatives along with the sigma phase were observed in the temperature range of 600–1000°C. This work also draws attention to why understanding the microstructural evolution and solidification behaviour is important in designing the HEAs to meet the industrial promises and in this context, the role of entropy, enthalpy and slow diffusion kinetics are discussed.
{"title":"Microstructural design opportunities and phase stability in the spray-formed AlCoCr0.75Cu0.5FeNi high entropy alloy","authors":"Vikas Shivam ,&nbsp;Shubhada Kar ,&nbsp;Gopi K. Mandal ,&nbsp;N.K. Mukhopadhyay ,&nbsp;V.C. Srivastava","doi":"10.1016/j.jalmes.2024.100138","DOIUrl":"10.1016/j.jalmes.2024.100138","url":null,"abstract":"<div><div>Designing a microstructure with controlled morphology is one of the determining factors for the optimum performance of a material. High entropy alloys (HEAs) have gained significant attention due to their enhanced mechanical and functional properties compared to conventional alloys, particularly based on opportunities for microstructural design. In this fast-developing field, varied thermal treatments can be applied to engineer a material as per the requirements. In the present work, we have studied the effect of thermal treatment on the microstructural modifications in the spray-formed AlCoCr<sub>0.75</sub>Cu<sub>0.5</sub>FeNi HEA. The alloy was characterized by using a light microscope, scanning electron microscope equipped with EDS detector and electron probe micro analyzer (EPMA). The elemental distribution and microstructural evolution of the alloy were studied by giving the heat treatments at different time-temperature spaces. The evolution of phases and their composition were correlated with the CALPHAD predicted property diagram and phase composition. It is observed that at a higher temperature of 1300°C, the alloy shows the simple solid solution phases to be more stable due to the high entropy effect, which brings down the Gibbs free energy of the system. The formation of the disordered BCC, FCC and their derivatives along with the sigma phase were observed in the temperature range of 600–1000°C. This work also draws attention to why understanding the microstructural evolution and solidification behaviour is important in designing the HEAs to meet the industrial promises and in this context, the role of entropy, enthalpy and slow diffusion kinetics are discussed.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100138"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Erratum to “Application of machine learning methods for the prediction of roll force and torque during plate rolling of micro-alloyed steel” [J. Alloys Metal. Syst. 4C (2023) 100044]
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100111
Suman Kant Thakur , Alok Kumar Das , Bimal Kumar Jha
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引用次数: 0
Corrigendum to “Comparative review and experimental validation of Tribological and Mechanical Properties of Zinc Aluminium Alloy (ZA27) and Aluminium Zinc Alloy (Al-25Zn)” [J. Alloy. Metall. Syst. 7 (2024) 100099]
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100129
Parmeshwar P. Ritapure , Rashmi G. Yadav , Vivek T. Rasal , Adinath V. Damale , Yashwant R. Kharde
{"title":"Corrigendum to “Comparative review and experimental validation of Tribological and Mechanical Properties of Zinc Aluminium Alloy (ZA27) and Aluminium Zinc Alloy (Al-25Zn)” [J. Alloy. Metall. Syst. 7 (2024) 100099]","authors":"Parmeshwar P. Ritapure ,&nbsp;Rashmi G. Yadav ,&nbsp;Vivek T. Rasal ,&nbsp;Adinath V. Damale ,&nbsp;Yashwant R. Kharde","doi":"10.1016/j.jalmes.2024.100129","DOIUrl":"10.1016/j.jalmes.2024.100129","url":null,"abstract":"","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100129"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Formation of B2 phase and its stability in equiatomic Al-Cu-Fe-Ni-Ti high entropy alloy
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100137
Yogesh Kumar Yadav , Mohammad Abu Shaz , Nilay Krishna Mukhopadhyay , Thakur Prasad Yadav
In the present investigation, we synthesized a single-phase high-entropy alloy in Al-Cu-Fe-Ni-Ti system by melting of the individual metals using a radiofrequency induction furnace under an argon environment. The as-synthesized alloy showed the formation of a B2-type ordered phase with a lattice parameter of 0.289 nm. The mechanical stability of this single phase high-entropy alloy was investigated under high-energy ball milling. The milling was performed at a speed of 400 rpm for 10, 20, and 40 h under a hexane medium with a ball-to-powder ratio of 40:1. The formation of nano crystallites (∼ 10 nm sizes) body centered cubic (BCC) phase (disordered B2) has been observed after 40 h of ball milling, which has been confirmed by X-ray diffraction and transmission electron microscopic investigation. The equiatomic Al-Cu-Fe-Ni-Ti high entropy alloy structure is observed to be quite stable during mechanical milling up to 40 h; only grain refinements and lattice strain accumulation were observed with milling time.
{"title":"Formation of B2 phase and its stability in equiatomic Al-Cu-Fe-Ni-Ti high entropy alloy","authors":"Yogesh Kumar Yadav ,&nbsp;Mohammad Abu Shaz ,&nbsp;Nilay Krishna Mukhopadhyay ,&nbsp;Thakur Prasad Yadav","doi":"10.1016/j.jalmes.2024.100137","DOIUrl":"10.1016/j.jalmes.2024.100137","url":null,"abstract":"<div><div>In the present investigation, we synthesized a single-phase high-entropy alloy in Al-Cu-Fe-Ni-Ti system by melting of the individual metals using a radiofrequency induction furnace under an argon environment. The as-synthesized alloy showed the formation of a B2-type ordered phase with a lattice parameter of 0.289 nm. The mechanical stability of this single phase high-entropy alloy was investigated under high-energy ball milling. The milling was performed at a speed of 400 rpm for 10, 20, and 40 h under a hexane medium with a ball-to-powder ratio of 40:1. The formation of nano crystallites (∼ 10 nm sizes) body centered cubic (BCC) phase (disordered B2) has been observed after 40 h of ball milling, which has been confirmed by X-ray diffraction and transmission electron microscopic investigation. The equiatomic Al-Cu-Fe-Ni-Ti high entropy alloy structure is observed to be quite stable during mechanical milling up to 40 h; only grain refinements and lattice strain accumulation were observed with milling time.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100137"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Erratum to “Hot deformation characteristics and processing map analysis of Al-Zn/stainless steel particles-based composites” [J. Alloys Metall. Syst., 7C (2024) 100086]
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100112
Theo Oluwasegun Joshua , Kenneth Kanayo Alaneme , Sodiq Abiodun Kareem , Michael Oluwatosin Bodunrin
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引用次数: 0
Thermo-microstructural-mechanical modeling of the effect of wire diameters on single-bead Ti-6Al-4V wall deposits by laser wire deposition 激光线径对单头Ti-6Al-4V壁沉积影响的热显微结构-力学模拟
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100134
Qi Zhang , Nejib Chekir , Mathieu Brochu
Six Ti-6Al-4V deposits with two geometries to extract tensile coupons from the build direction (Z) and travel direction (X), were produced by laser wire deposition (LWD) with different wire diameters. Inconsistent wall profiles were found for deposits produced with wire diameters of 1.1 and 1.6 mm due to the inhomogeneous melt pool sizes generated during the deposition process, indicating the unstable thermal history. It was found that increasing the wire diameter resulted in increased heat input, which produced coarser grains and resulted in decreased strength. Fractography analysis showed that greater amounts of defects were observed on the fracture surfaces of deposits produced with increased wire diameters, which weakened the tensile properties. The grain boundary α and the surrounding colony α facilitated crack propagation and caused early failure. This research also proposed a platform using modeling techniques to control cooling rates, microstructure (α/β phase fractions and α lath widths) and yield strength of LWD Ti-6Al-4V. The accuracy of all models was validated by comparing them with experimental data.
采用不同线径的激光线沉积(LWD)技术,制备了6种具有两种几何形状的Ti-6Al-4V镀层,分别从构建方向(Z)和行进方向(X)提取拉伸薄片。由于沉积过程中熔池尺寸的不均匀,导致线材直径为1.1和1.6 mm的镀层壁形不一致,表明其热历史不稳定。结果表明,增大线材直径导致热输入增大,晶粒变粗,强度下降。断口形貌分析表明,随着线材直径的增加,断口表面出现了更多的缺陷,从而削弱了镀层的拉伸性能。晶界α和周围的集落α有利于裂纹扩展,导致早期破坏。本研究还提出了一个利用建模技术控制Ti-6Al-4V随钻材料冷却速率、微观结构(α/β相分数和α板条宽度)和屈服强度的平台。通过与实验数据的比较,验证了各模型的准确性。
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引用次数: 0
Mechanical alloying of bronze with aluminum and nickel: Impact on corrosion resistance and hardness 青铜与铝、镍的机械合金化:对耐蚀性和硬度的影响
Pub Date : 2024-12-01 DOI: 10.1016/j.jalmes.2024.100136
Qanita Tayyaba , Adnan Qayyum Butt , Tayyab Ali khan , Zeeshan Nazar , Abdul Rehman , Wu Yusheng
The effect of alloying bronze with aluminum (Al) and nickel (Ni) on hardness and corrosion resistance is examined in this work. Bronze alloys were manufactured in vacuum induction melting (VIM) using 99.9 % pure copper as the main component. High-purity tin, aluminum, and nickel were added. This study examined the corrosion behavior of an Al and Ni-modified bronze alloy in a 3.5 % NaCl solution using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The corrosion resistance of the alloys was assessed, with findings indicating that Ni-bronze had the best corrosion resistance—nearly twice as much as bronze. Microstructural examinations and Rockwell hardness testing further revealed that nickel-bronze had the highest hardness values, owing to strong nickel intermetallic phases formed. This thorough analysis highlights how Ni-bronze alloys perform better in challenging conditions, which qualifies them for uses needing strong mechanical durability and resistance to corrosion.
研究了铝(Al)和镍(Ni)合金对青铜硬度和耐蚀性的影响。以99.9 %纯铜为主要成分,采用真空感应熔炼法制备了青铜合金。添加了高纯锡、铝和镍。采用动电位极化(PDP)和电化学阻抗谱(EIS)研究了Al和ni改性青铜合金在3.5% % NaCl溶液中的腐蚀行为。对合金的耐腐蚀性进行了评估,结果表明镍青铜的耐腐蚀性最好,几乎是青铜的两倍。显微组织检查和洛氏硬度测试进一步表明,由于形成了强镍金属间相,镍青铜的硬度值最高。这项全面的分析强调了镍青铜合金在具有挑战性的条件下表现更好,这使它们有资格用于需要强大的机械耐久性和耐腐蚀性的用途。
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引用次数: 0
Effect of hot-pressing sintering temperature and pressure on the densification and properties of Ti-TiB composites 热压烧结温度和压力对钛-钛硼复合材料致密化和性能的影响
Pub Date : 2024-11-20 DOI: 10.1016/j.jalmes.2024.100132
Padiri Murali, Kausik Chattopadhyay, Vikas Jindal
Ti/TiB composites exhibit promising potential for applications in the automotive, aerospace, and biomedical sectors. Hot pressing coupled with in situ reaction synthesis is a commonly employed technique for fabricating discontinuously TiB-reinforced titanium matrix composites. Despite its efficacy, comprehensive research investigating the influence of hot-pressing process parameters on the densification and properties of these composites remains scarce. This study systematically examined the effects of pressure (16–48 MPa) and temperature (1250 °C to 1350 °C) on the density, microstructure, and mechanical properties of Ti/TiB composites produced through hot pressing. By analyzing densification curves and rate curves, the densification behavior under varying processing conditions was elucidated. The results indicate that elevated sintering temperatures and pressures correlate with increased densification rates, reduced porosity, and enhanced sample density. A strong relationship between relative densities and hardness was observed. This research contributes to a deeper understanding of the hot-pressing sintering process for Ti-TiB composites and facilitates the optimization of processing conditions.
钛/钛硼复合材料在汽车、航空航天和生物医学领域的应用潜力巨大。热压结合原位反应合成是制造非连续 TiB 增强钛基复合材料的常用技术。尽管热压技术非常有效,但有关热压工艺参数对这些复合材料致密化和性能影响的综合研究仍然很少。本研究系统地考察了压力(16-48 兆帕)和温度(1250 ℃ 至 1350 ℃)对热压生产的钛/钛硼复合材料的密度、微观结构和机械性能的影响。通过分析致密化曲线和速率曲线,阐明了不同加工条件下的致密化行为。结果表明,烧结温度和压力的升高与致密化率的增加、孔隙率的降低和样品密度的提高相关。相对密度和硬度之间的关系也很密切。这项研究有助于加深对 Ti-TiB 复合材料热压烧结过程的理解,并有助于优化加工条件。
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引用次数: 0
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Journal of Alloys and Metallurgical Systems
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