Journal of Alloys and Metallurgical Systems最新文献

{"title":"Effect of hot-pressing sintering temperature and pressure on the densification and properties of Ti-TiB composites","authors":"Padiri Murali,&nbsp;Kausik Chattopadhyay,&nbsp;Vikas Jindal","doi":"10.1016/j.jalmes.2024.100132","DOIUrl":"10.1016/j.jalmes.2024.100132","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100132"},"PeriodicalIF":0.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706634","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}

{"title":"Microstructural evolution and mechanical properties of Cr–Ni–Mo–V steel with banded structure during tempering","authors":"Yunfei Du ,&nbsp;Zhengzhao Gu ,&nbsp;Yaqin Zhang ,&nbsp;Rui Bai","doi":"10.1016/j.jalmes.2024.100131","DOIUrl":"10.1016/j.jalmes.2024.100131","url":null,"abstract":"<div><div>Effects of tempering temperature on the microstructure evolution and mechanical properties of Cr–Ni–Mo–V steel with banded structure were investigated in this study. It is indicated that the tempering temperature has a significant influence on the morphology of the martensite lath in the banded structure. Carbides M₃C, M₂C and M₂C/M₇C₃ are identified at tempering temperature of 430 °C, 580 °C and 630 °C, respectively. The MC precipitate is a stable phase existing in a wide range of tempering temperature. As the tempering temperature increases, the tensile strength is gradually decreased, while the elongation and impact toughness are improved. The delaminated crack observed in the fracture surface is connected to the banded structure in Cr–Ni–Mo–V steel. It is suggested that the enhancement of ductility and toughness can be attributed to the transformation of the stress state and the blunting of the crack tip. The relationship between the microstructure and mechanical properties is explored, and a detailed insight into the precipitation processes of carbides at different tempering temperature are conducted.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100131"},"PeriodicalIF":0.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706633","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}

{"title":"Data-driven design of high bulk modulus high entropy alloys using machine learning","authors":"Sandeep Jain ,&nbsp;Reliance Jain ,&nbsp;Vinod Kumar ,&nbsp;Sumanta Samal","doi":"10.1016/j.jalmes.2024.100128","DOIUrl":"10.1016/j.jalmes.2024.100128","url":null,"abstract":"<div><div>In the current research, machine learning (ML) models were used as a tool for predicting the bulk modulus of High Entropy Alloys (HEAs). ML was employed to optimize HEA compositions for superior bulk modulus values. The study assessed five regression models: Random Forest (RF), K-Nearest Neighbors (KNN), XGBoost (XGB), Support Vector Regression (SVR), and Lasso regression. The XGB regression model delivered the best results, with an R-squared (R²) value of 95.2 % and an RMSE of 2.6 % on the validation dataset. The XGB model's performance was further validated by experimental work, showing an R² value of 94.8 % and an RMSE of 3.6 %. The R-squared, RMSE, and MAE values during training, testing, and validation for the XGB model ranged from 93.2 % to 99.62 %, 0.97 to 3.64, and 0.12 to 1, respectively. Furthermore, we used the top three trained models to predict the bulk modulus of six new HEAs that were not part of the training, testing, or validation datasets. These predictions achieved R² values of 94.8 %, 93.4 %, and 92.4 %, RMSE values of 3.6 %, 4.1 %, and 4.4 %, along with MAE values of 3.4 %, 3.8 %, and 4.1 %, for the XGB, Lasso, and SVR models, respectively. This work advances the field by bridging the gap in HEA discovery and property evaluation, offering novel methods for designing HEAs with desirable bulk modulus values, and unlocking new possibilities for HEA applications.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100128"},"PeriodicalIF":0.0,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706631","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}

{"title":"High-temperature deformation behavior and concurrent microstructural evolution in novel Ni-based compositionally complex alloy","authors":"Ananya Chattree ,&nbsp;Amrit Pandey ,&nbsp;Saurabh S. Nene ,&nbsp;Jaiveer Singh","doi":"10.1016/j.jalmes.2024.100127","DOIUrl":"10.1016/j.jalmes.2024.100127","url":null,"abstract":"<div><div>In this study, a novel Ni_46.8Fe₂₃Co₁₀V₇(Al, Si)_6.6 compositionally complex alloy (Ni-CCA) has been designed by merging the CALPHAD approach with the theoretical concepts (enthalpy of mixing, atomic radius mismatch parameter, valence electron concentration (VEC), and pair sigma forming elements (PSFE)). The theoretical analysis and the CALPHAD modeling predict the formation of a single FCC phase at room temperature along with the absence of TCP phases in the designed Ni-CCA. Subsequently, the pseudo-binary phase diagram obtained from Thermo-Calc through the latest HEA database predicts the presence of newer strengthening ordered phases containing Ni-Al-Si at elevated temperatures in Ni-CCA. Microstructural characterization of as-cast Ni-CCA displayed the formation of γ-FCC phase dominated microstructure containing a minor fraction of BCC phase at room temperature whereas high-temperature compression depicted synergistic precipitation of Ni-Al-Si containing L1₂ type precipitate and dynamic recovery/recrystallization events during deformation leading to a marginal drop in yield strength (YS) at 800 °C. Moreover, the formation of necklace microstructure in a deformed specimen confirms the occurrence of dynamic recrystallization (DRX) in novel Ni-CCA.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100127"},"PeriodicalIF":0.0,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658769","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}

{"title":"Annealing textures of low stacking fault energy (SFE) FCC materials: Traversing binary to high entropy alloys (HEAs)","authors":"P.P. Bhattacharjee ,&nbsp;N. Sai Teja ,&nbsp;S. Paul ,&nbsp;P.K. Ojha ,&nbsp;R. Saha","doi":"10.1016/j.jalmes.2024.100130","DOIUrl":"10.1016/j.jalmes.2024.100130","url":null,"abstract":"<div><div>Although the origin of brass-type deformation texture in low SFE alloys has been extensively investigated, the annealing textures of such materials have received less attention, mostly limited to brass and different austenitic steels. On the other hand, the annealing textures of low SFE HEAs have been investigated more intensively recently; however, a comprehensive insight into annealing texture formation from HEAs down to binary systems is missing. To bridge the gap, the annealing texture of FCC single-phase Cu-11.6 at%Al alloy with SFE ∼10 <span><math><mrow><mi>mJ</mi><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span> comparable to HEAs was first investigated as a model binary system and compared with selected low SFE binary, medium entropy (MEAs), and HEAs to understand the similarities and characteristic differences. The cold-rolled alloy showed massive nanostructure and a typical brass-type texture featured by a strong B ({110}&lt;112&gt;) component expected for a low SFE alloy. Annealing resulted in ultrafine recrystallized microstructure but extensive grain growth at higher temperatures, like other binary alloys but unlike HEAs. The annealing texture showed the retention of deformation components, weak α-fiber (ND//&lt;110&gt;) components and a high random fraction. These features were very similar to HEAs/MEAs and attributed to the absence of oriented nucleation (ON) or oriented growth (OG) mechanisms. However, striking differences such as strong BR ({236}&lt;385&gt;) and D ({113}&lt;332&gt;) components in the brass alloy, selective growth of the G ({110}&lt;001&gt;) and G/B ({110}&lt;115&gt;) in binary Ni-60wt%Co alloy, and strong retention of the {110}&lt;112&gt; component in the annealing texture of (FCC+B2) dual-phase AlCrFe₂Ni₂ HEA were remarkable. These outcomes indicated underlying microstructural effects on annealing texture formation in low SFE binary to HEAs/MEAs and should motivate further research.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100130"},"PeriodicalIF":0.0,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706630","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}

{"title":"Determination the crystallographic information of hexagonal magnesium via X-ray diffraction profiles","authors":"Yanlian Liu ,&nbsp;Liyang Huang ,&nbsp;Limin Hou ,&nbsp;TaoTao Li","doi":"10.1016/j.jalmes.2024.100126","DOIUrl":"10.1016/j.jalmes.2024.100126","url":null,"abstract":"<div><div>Researching the crystallographic information is imperative in hexagonal magnesium. In this paper, the comparative evaluation on the crystallite size and shape, strain and texture are carried with semi-quantitively techniques, such as Williamson-hall function, Halder-Wagner function, March-Dollase function, ellipsoid model and the Rietveld method. Both the Williamson-hall function and Williamson Hall function are suitable to determine the crystallite size and strain, while ellipsoid model is suitable to reveal the crystallite shape. With conformed by the classical texture analysis, the Rietveld method and quantitively texture is suitable to determining the texture with fiber typed texture.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100126"},"PeriodicalIF":0.0,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706632","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}

{"title":"Exploring the effect of friction stir welding parameters on the strength of AA2024 and A356-T6 aluminum alloys","authors":"Ibrahim Sabry","doi":"10.1016/j.jalmes.2024.100124","DOIUrl":"10.1016/j.jalmes.2024.100124","url":null,"abstract":"<div><div>The amalgamation of AA2024 and AA356-T3 in general engineering applications can be advantageous for structures necessitating both elevated strength and corrosion resistance. This is particularly pertinent in manufacturing, where lightweight properties and robustness are crucial, as seen in high-performance industrial equipment. Nevertheless, conventional fusion welding of these aluminium alloys poses significant challenges. This work focuses on examining the mechanical and microstructure characteristics of Alloys made of high-strength aluminium, AA2024, and A356-T6, using the Friction Stir Welding (FSW) process. The investigation evaluated the impacts of key parameters such as rotational speed (RS) ranging from 1000 to 2000 rpm, travel speed (TS) from 10 to 15 mm/min, and tilt angle (1°–2°) on ultimate tensile strength (UTS) tool wear (TW), temperature distribution(T), residual stress (RS) and hardness (HV). The experimental procedure was conducted using Response Surface Methodology (RSM), while SEM was utilized to analyze the fractured surface morphology. According to the results, the highest factor of mechanical properties was obtained for welds made using dissimilar aluminium alloys AA2024 and AA356-T3 with a constant tilt angle of 1.54°, traverse speed of 10 mm/min, and rotational speed of 2000 rpm. The highest tensile strength, hardness, temperature, and residual stress of 381 MPa,114 HVN, 504 C°, and 76.30 MPa respectively, were noted for the weld zone. However, The lowest tool wear of 0.13595 at a constant tilt angle of 1.54°, traverse speed of 15 mm/min, and rotational speed of 1000 rpm.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100124"},"PeriodicalIF":0.0,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658767","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}

{"title":"Multi-pass laser welding with cut-wire particles of 50 mm thick steel plates","authors":"Mohamed Wahba ,&nbsp;Masami Mizutani ,&nbsp;Seiji Katayama","doi":"10.1016/j.jalmes.2024.100125","DOIUrl":"10.1016/j.jalmes.2024.100125","url":null,"abstract":"<div><div>Multi-pass laser welding with filler wire feeding shows significant potential for welding thick plates. However, this method faces challenges due to the need for edge preparation and stringent control of parameters such as wire feed speed and the relative positioning to the laser beam. Utilizing cut-wire particles instead of solid wire may address these limitations. This investigated the usage of cut-wire particles in multi-pass laser welding of 50 mm thick square groove butt joints. The study involved welding experiments to optimize the amount of cut-wire particles, laser power density, and travel speed for root and buildup passes. The final pass employed hybrid laser-arc welding to compensate for the voids between the cut-wire particles. The joints were successfully welded in eight passes. Mechanical testing demonstrated that the welded joints exhibited strength surpassing that of the base metal. The heat-affected zone displayed a hardness exceeding 350 HV. The fusion zones of the hybrid and buildup passes showed an impact toughness of 100 J, while the root pass fusion zone exhibited an impact toughness of approximately 45 J. This difference was attributed to the presence of a bainitic/martensitic microstructure in the root pass, compared to a mixture of acicular and grain boundary ferrite in the hybrid and buildup passes.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100125"},"PeriodicalIF":0.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658766","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}

{"title":"Grain size dependent deformation microstructure evolution and work-hardening in CoCrNi medium entropy alloy","authors":"Shuhei Yoshida ,&nbsp;Genki Yamashita ,&nbsp;Takuto Ikeuchi ,&nbsp;Yu Bai ,&nbsp;Akinobu Shibata ,&nbsp;Nobuhiro Tsuji","doi":"10.1016/j.jalmes.2024.100123","DOIUrl":"10.1016/j.jalmes.2024.100123","url":null,"abstract":"<div><div>This study clarified the grain size dependence of the deformation microstructure evolution and work-hardening behavior in CoCrNi medium entropy alloy. We fabricated fully recrystallized specimens with coarse-grained (CG) and ultrafine-grained (UFG) specimens by severe plastic deformation and subsequent annealing processes. Tensile deformation was applied to the specimens at room temperature. The UFG specimen exhibited both high strength and high ductility compared to conventional UFG metals due to the high work-hardening ability. In the CG specimen, three distinct types of deformation microstructures consisting of dislocations and deformation twins developed depending on grain orientations, similar to the single-crystalline specimens. In the UFG specimen, widely-extended stacking faults and randomly-tangled dislocations were found to coexist in most grains. Deformation twins were found to nucleate without evidence of dislocation reactions regardless of grain orientations, implying abnormal nucleation mechanisms of deformation twins in the UFG specimen. Dislocation densities quantified by in-situ synchrotron XRD measurements during tensile deformation were higher in the UFG specimen than those in the CG specimen and conventional UFG metals. Our analysis showed that the work-hardening behavior of the specimens was primarily controlled by increases in dislocation density as well as the introduction of planar defects during deformation. Through comparisons with the CG specimen and conventional UFG metals, we concluded that the excellent work-hardening ability of the UFG specimen was mainly due to the evolution of unique deformation microstructures and rapid increase in dislocation density, which could be due to inhibited dynamic recovery in the MEA.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100123"},"PeriodicalIF":0.0,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658768","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}

{"title":"Enhancing strength and γ’-coarsening resistance through micro-alloying additions to an oxidation resistant Al-Co-Cr-Fe-Ni-Ti compositionally complex alloy","authors":"Jithin Joseph ,&nbsp;Murugesan Annasamy ,&nbsp;Peter Hodgson ,&nbsp;Matthew Barnett ,&nbsp;Daniel Fabijanic","doi":"10.1016/j.jalmes.2024.100122","DOIUrl":"10.1016/j.jalmes.2024.100122","url":null,"abstract":"<div><div>The effect of alloying additions of Mo and Ta (0.4 at% each) on the microstructure, mechanical properties, oxidation resistance and coarsening resistance of the L1₂-strengthened (γ’) Al-rich Ni₅₁Co₁₈Fe₅Cr₁₀Al₁₂Ti₄ alloy was determined. The micro-alloyed composition exhibited improved yield strength (from room temperature to 1000 ^°C) and coarsening resistance (enhanced by 33 % at 800 ^°C) compared to the base Ni₅₁Co₁₈Fe₅Cr₁₀Al₁₂Ti₄ alloy. The present Al-rich alloy compositions (both the micro-alloyed and reference compositions) exhibited superior oxidation resistance (800–1000 ^°C) compared to a Ti-rich Ni₅₁Co₁₈Fe₅Cr₁₀Al₈Ti₈ alloy (with similar precipitate volume fraction and (Al+Ti)-content) and commercial Inconel 718. The present work highlights the promise of Al-rich γ’-strengthened Al-Co-Cr-Fe-Ni-Ti alloys as candidates for high-performance, high-temperature structural materials, characterised by an attractive blend of strength, resistance to coarsening, and resilience against oxidation.</div></div>","PeriodicalId":100753,"journal":{"name":"Journal of Alloys and Metallurgical Systems","volume":"8 ","pages":"Article 100122"},"PeriodicalIF":0.0,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658765","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}