Intermetallics最新文献_第10页

Nanoindentation behavior of the laser-repaired CoCrFeNiV high-entropy alloy

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108585

Chao Wang , Weihai Huang , Chunxue Yi , Minqiang Jiang , Hu Huang , Jiwang Yan

{"title":"Nanoindentation behavior of the laser-repaired CoCrFeNiV high-entropy alloy","authors":"Chao Wang , Weihai Huang , Chunxue Yi , Minqiang Jiang , Hu Huang , Jiwang Yan","doi":"10.1016/j.intermet.2024.108585","DOIUrl":"10.1016/j.intermet.2024.108585","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) are solid-solution alloys composed of multiple elements, exhibiting excellent mechanical properties. The unique plastic deformation mechanism induced by their specific solid solution structures has attracted considerable attention but remains incompletely understood, particularly at the micro-scale. In this study, the surface morphology, chemical composition, and microstructures of CoCrFeNiV HEA before and after laser remelting repair were investigated. Nanoindentation testing was employed to characterize the surface hardness and creep behavior of the repaired surface. The distribution of surface hardness before and after laser remelting, as well as the indentation creep behavior under different loads, were studied. The mechanism of indentation creep on the repaired surface was discussed and analyzed. The effect of microstructures of HEAs, including precipitated phases and sub-grain boundaries, on dislocation-dominated micro-scale plastic deformation was elucidated by the transmission electron microscope (TEM). This study contributes to an in-depth understanding of the creep behavior and micro-scale deformation mechanisms in HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108585"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interfacial reaction and IMC growth kinetics at the Bi2Te3/Ag interface during isothermal aging 等温老化过程中 Bi2Te3/Ag 界面的界面反应和 IMC 生长动力学

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-31 DOI: 10.1016/j.intermet.2025.108686

Seong-Woo Pak , Hiroaki Tatsumi , Jianhao Wang , Albert T. Wu , Hiroshi Nishikawa

{"title":"Interfacial reaction and IMC growth kinetics at the Bi2Te3/Ag interface during isothermal aging","authors":"Seong-Woo Pak , Hiroaki Tatsumi , Jianhao Wang , Albert T. Wu , Hiroshi Nishikawa","doi":"10.1016/j.intermet.2025.108686","DOIUrl":"10.1016/j.intermet.2025.108686","url":null,"abstract":"<div><div>Bonding materials that can withstand high operating temperatures are essential for increasing the conversion efficiencies of thermoelectric power-generation devices. Sn-based solders commonly used to join thermoelectric materials and electrodes have the disadvantage of limiting the maximum operating temperature to 150 °C because of their low melting point. To overcome this limitation, in the present study, Ag nanoparticle paste with high-temperature stability, low electrical resistivity, high thermal conductivity, and printability was used for bonding a Bi<sub>2</sub>Te<sub>3</sub> thermoelectric material and an electroless nickel immersion gold (ENIG)-plated Cu electrode.</div><div>We performed isothermal aging at 200 °C from 0 to 1000 h to analyze the microstructural and thickness changes in intermetallic compounds (IMCs). Initially, a heterogeneous distribution of the IMC layers was observed at the bonding interface; over time, the IMC structures became clearly distinct. The IMC thickness increased from ≤3.0 μm (initial) to 45.6 μm in 1000 h, growing by a factor of approximately 15.2. We analyzed the growth kinetics of AgTe and BiTe IMCs. The growth exponent <em>n</em> of the AgTe IMC was found to be 0.3, indicating grain boundary diffusion with grain-growth control, whereas the <em>n</em> value of the BiTe IMC was 0.5, which is consistent with volumetric diffusion-controlled growth. These differences in the growth behavior indicate that different diffusion mechanisms affect the reliability and performance of the bonding interface.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108686"},"PeriodicalIF":4.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182238","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

On the plasticity and inheritance in shear-band-rejuvenated metallic glasses

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-31 DOI: 10.1016/j.intermet.2025.108685

H.B. Zhou , X.H. Jing , L. Yu , G. Ding , S.L. Cai , C.J. Shi , L.H. Dai , M.Q. Jiang , G. Wilde

{"title":"On the plasticity and inheritance in shear-band-rejuvenated metallic glasses","authors":"H.B. Zhou , X.H. Jing , L. Yu , G. Ding , S.L. Cai , C.J. Shi , L.H. Dai , M.Q. Jiang , G. Wilde","doi":"10.1016/j.intermet.2025.108685","DOIUrl":"10.1016/j.intermet.2025.108685","url":null,"abstract":"<div><div>Structural rejuvenation holds promise for enhancing the plastic deformability of metallic glasses. However, whether structural rejuvenation through the introduction of shear bands unequivocally leads to enhanced plasticity remains contentious. Herein, we investigated two metallic glasses with distinct initial energy states: as-cast and well-relaxed. These glasses underwent a 50 % thickness reduction through cold rolling. Cold rolling significantly reduces the plasticity of as-cast glasses but notably enhances plasticity along the rolling direction for annealed glasses. This underscores the dependence of plasticity in processed glasses on both the initial state and shear band distribution. Additionally, it was observed that cold-rolled glasses exhibit plastic anisotropy, and re-vitrified glasses remarkably inherit this behavior. Synchrotron X-ray diffraction analysis further revealed that the transformation from face-shared to edge-shared or vertex-shared medium-range orders plays a significant role in the plastic response of glasses. Our findings suggest that regulating shear band distribution, along with appropriate re-vitrification treatment, provides a promising strategy to tailor the structure and properties of metallic glasses.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108685"},"PeriodicalIF":4.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during the inter-pass annealing 层间退火过程中 Ti-43Al-4Nb-1Mo-0.2B 合金的再结晶和相变研究

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-30 DOI: 10.1016/j.intermet.2025.108681

Xiaofei Chen , Bin Tang , Beibei Wei , Xichuan Cao , Xiangyu Pan , Huiqin Wang , Guoming Zheng , Jinshan Li

{"title":"Study on recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during the inter-pass annealing","authors":"Xiaofei Chen , Bin Tang , Beibei Wei , Xichuan Cao , Xiangyu Pan , Huiqin Wang , Guoming Zheng , Jinshan Li","doi":"10.1016/j.intermet.2025.108681","DOIUrl":"10.1016/j.intermet.2025.108681","url":null,"abstract":"<div><div>The multi-pass thermomechanical process is a common forming method employed for brittle metallic materials such as TiAl alloys, where complex recrystallization behavior and phase transformation are utilized to promote grain refinement and microstructural evolution. Thermal simulation compression experiments at 1200 °C/0.01 s<sup>−1</sup> were performed to investigate the recrystallization and phase transformation during inter-pass annealing. The results showed that a little dynamic recrystallization (DRX) preferentially occurred within the β<sub>o</sub>+γ mixed structures and along the boundaries of α<sub>2</sub>+γ lamellar colonies. Moreover, the inter-pass annealing had little effect on recrystallization of α<sub>2</sub> phase, but facilitated the α/α<sub>2</sub>→β/β<sub>o</sub> phase transformation to accelerate the fragmentation of α<sub>2</sub> lamellae. Also, the pre-deformed β<sub>o</sub> phase mainly underwent static recrystallization (SRX), which was enhanced with the increasing the proceeding-pass strain and inter-pass annealing duration. The recrystallization mechanisms of α<sub>2</sub> and β<sub>o</sub> phase were continuous recrystallizations, where nucleation inoculation or early nucleation induced the weak recrystallization texture similar to deformation texture in local regions, yet insufficient recrystallization eliminated the texture. The extension of annealing time at different strains was favorable for SRX of the γ phase, but meta-recrystallization (MDRX) could only occur in short-time annealing at high strains. Consequently, the design and optimization of multi-pass deformation process were proposed.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108681"},"PeriodicalIF":4.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of isothermal section in the La-Ni-Si system at 1073 K

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-30 DOI: 10.1016/j.intermet.2025.108671

Tianlei Zhang , Kai Wang , Kailin Huang , Qingrong Yao , Zhao Lu , Qianxin Long , Jianqiu Deng , Jiang Wang , Huaiying Zhou

{"title":"Experimental investigation of isothermal section in the La-Ni-Si system at 1073 K","authors":"Tianlei Zhang , Kai Wang , Kailin Huang , Qingrong Yao , Zhao Lu , Qianxin Long , Jianqiu Deng , Jiang Wang , Huaiying Zhou","doi":"10.1016/j.intermet.2025.108671","DOIUrl":"10.1016/j.intermet.2025.108671","url":null,"abstract":"<div><div>The isothermal section of the La-Ni-Si ternary system at 1073 K has been constructed in this work by using X-ray diffraction (XRD), and back-scattered electron (BSE) mode equipped with an electron probe microanalysis (EPMA). The 17 ternary compounds have been confirmed in the isothermal sections at 1073 K: LaNi<sub>11.6–9.5</sub>Si<sub>1.4–3.5</sub>, LaNi<sub>8.8–8.4</sub>Si<sub>4.2–4.6</sub>, LaNi<sub>7.8–6.5</sub>Si<sub>5.2–6.5</sub>, LaNi<sub>2</sub>Si<sub>2</sub>, LaNiSi<sub>2</sub>, La<sub>2</sub>NiSi<sub>3</sub>, LaNiSi, La<sub>14</sub>Ni<sub>6</sub>Si<sub>11</sub>, La<sub>15</sub>Ni<sub>4</sub>Si<sub>13</sub>, LaNi<sub>9</sub>Si<sub>2</sub>, La<sub>2</sub>NiSi, La<sub>6</sub>Ni<sub>2</sub>Si<sub>3</sub>, LaNi<sub>4</sub>Si, La<sub>3</sub>Ni<sub>3</sub>Si<sub>2</sub>, La<sub>2</sub>Ni<sub>3</sub>Si<sub>2</sub>, LaNi<sub>2</sub>Si, and La<sub>2</sub>(Ni,Si). This isothermal section also consists of 44 + 6 three-phase regions. At 1073K, the maximum solid solubility of Si in the (Ni) phase is about 10.28 at.%, the maximum solid solubility of Si in the (LaNi<sub>5</sub>) phase is about 11.80 at.%, and the maximum solid solubility of Ni in the <em>β</em>-LaSi<sub>2</sub> phase is about 6.09 at.%. The present experimental results could be used as guidance to practical applications and input to future thermodynamic assessments.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108671"},"PeriodicalIF":4.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low plastic deformation: Its impact on the microstructural evolution during heat treatment of nickel-based wrought superalloy GH4698 低塑性变形：低塑性变形：对镍基锻造超级合金 GH4698 热处理过程中微观结构演变的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-29 DOI: 10.1016/j.intermet.2025.108678

Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan

{"title":"Low plastic deformation: Its impact on the microstructural evolution during heat treatment of nickel-based wrought superalloy GH4698","authors":"Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan","doi":"10.1016/j.intermet.2025.108678","DOIUrl":"10.1016/j.intermet.2025.108678","url":null,"abstract":"<div><div>A comprehensive investigation into the effects of low plastic deformation (LPD) at ambient temperature on the microstructural evolution of the nickel-based wrought superalloy GH4698 during solution heat treatment (SHT) was conducted. Applying 2%–10 % LPD to cylindrical specimens did not markedly alter the grain morphology. However, a portion of the initial annealing twin boundaries (TBs) would transform into other types of grain boundaries under the application of the stress field. Deformation microstructures with effective strains ranging from 0.025 to 0.042 (corresponding to the entire region of the 4 % deformed sample and the near-end region of the 6 % deformed sample) exhibited a pronounced increase in twin fraction during SHT, accompanied by the formation of multiple large twin-related domains (TRDs) and several abnormally large grains (ALGs). The occurrence of TRDs and their internal ALGs stems from the constrained nucleation of recrystallization and extensive twinning. The residual strain energy not alleviated through recrystallization, driven by thermal stress, initiates twin nucleation and promotes grain boundary migration. The emergence and disappearance of island-like twins, as well as twins terminating within grains, suggest that the introduced TBs include not only coherent TBs but also potentially highly mobile incoherent TBs during the evolution of TRDs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108678"},"PeriodicalIF":4.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid TLPD bonding of highly reliable full (Cu,Ni)6Sn5 IMC micro-joints using Cu-8Ni substrate for power device packaging

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-29 DOI: 10.1016/j.intermet.2025.108675

Yanqing Lai , Gaosong Li , Meiping Liu , Shuai Zhang , Yuanyuan Qiao , Yuanwei Jia , Ning Zhao

{"title":"Rapid TLPD bonding of highly reliable full (Cu,Ni)6Sn5 IMC micro-joints using Cu-8Ni substrate for power device packaging","authors":"Yanqing Lai , Gaosong Li , Meiping Liu , Shuai Zhang , Yuanyuan Qiao , Yuanwei Jia , Ning Zhao","doi":"10.1016/j.intermet.2025.108675","DOIUrl":"10.1016/j.intermet.2025.108675","url":null,"abstract":"<div><div>The full intermetallic compound (IMC) micro-joints formed by transient liquid phase diffusion (TLPD) bonding technology are playing an increasingly key role in power device packaging. In this investigation, the highly reliable full (Cu,Ni)<sub>6</sub>Sn<sub>5</sub> IMC micro-joints with Cu-8Ni as the substrates was rapidly fabricated. Replacing Cu with Cu-8Ni alloy as the substrate not only greatly accelerated the growth of fine (Cu,Ni)<sub>6</sub>Sn<sub>5</sub> grains during bonding, but also completely suppressed the formation of brittle Cu<sub>3</sub>Sn layer and Kirkendall voids during aging. The microstructure, elemental distribution, grain features, mechanical properties and fractural micromorphology of the full IMC micro-joints after bonding and aging were systematically investigated. Moreover, the refinement and rapid growth mechanism of the (Cu,Ni)<sub>6</sub>Sn<sub>5</sub> IMC grains was discussed in detail. The obtained full IMC micro-joints only consisting of fine (Cu,Ni)<sub>6</sub>Sn<sub>5</sub> grains presented an excellent thermostability. The shear strength of the full (Cu,Ni)<sub>6</sub>Sn<sub>5</sub> micro-joints slightly dropped from 71.87 MPa before aging to 67.63 MPa after aging at 200 °C for 400 h. The highly reliable full (Cu,Ni)<sub>6</sub>Sn<sub>5</sub> micro-joints with Cu-8Ni as the substrates obtained by TLPD bonding was proved to be an effective method, which could dramatically decrease bonding time and enhance the thermostability and reliability of the full IMC micro-joints in third-generation semiconductor power device packaging.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108675"},"PeriodicalIF":4.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural-weakening mapping to seismic-like slip avalanches in bulk-metallic glasses 结构削弱映射到块状金属玻璃中的地震样滑移雪崩

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-29 DOI: 10.1016/j.intermet.2025.108674

Jiaojiao Li , Junwei Qiao , Yong Liu , Yunzhi Ma , Xijing Zhu , Junyuan Wang , Zhiqiang Zeng , Linzheng Ye , Huihu Lu , Karin A. Dahmen , Peter K. Liaw

{"title":"Structural-weakening mapping to seismic-like slip avalanches in bulk-metallic glasses","authors":"Jiaojiao Li , Junwei Qiao , Yong Liu , Yunzhi Ma , Xijing Zhu , Junyuan Wang , Zhiqiang Zeng , Linzheng Ye , Huihu Lu , Karin A. Dahmen , Peter K. Liaw","doi":"10.1016/j.intermet.2025.108674","DOIUrl":"10.1016/j.intermet.2025.108674","url":null,"abstract":"<div><div>“Smaller is softer” mainly refers to the reverse size dependence of plasticity for bulk-metallic glasses (BMGs). Here, we report experimental results showing that “flatter acts more ductile”. Specifically, by choosing low aspect ratios for the samples, like 1:2, in compression experiments it is possible to eliminate catastrophically large (system-spanning) slips that are often seen for BMG samples with large aspect ratios of 3:1, 2:1, and 1:1. Moreover, for BMG samples with an aspect ratio of 1:2, multiple parallel shear bands produce self-similar slip avalanches, whose size distribution follows the stress-integrated power-law exponent of around 1.0. This exponent value, agrees with the prediction of mean field theory for a near-zero structural-weakening factor, modeling ductile behavior. The absence of structural weakening for the aspect ratio of 1:2 suggests that this aspect ratio may be preferable for some applications where large slips are undesirable because they lead to jerky deformation behavior and are difficult to control.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108674"},"PeriodicalIF":4.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and mechanical properties of CoCrNi/GH99 medium entropy alloy brazed joints: Formation of medium entropy brazing seam

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-28 DOI: 10.1016/j.intermet.2025.108680

X.C. Li , J. Sun , Y.Z. Liu , W. Fu , X.G. Song , S.R. Yang , F. Long , S.P. Hu

{"title":"Microstructure and mechanical properties of CoCrNi/GH99 medium entropy alloy brazed joints: Formation of medium entropy brazing seam","authors":"X.C. Li , J. Sun , Y.Z. Liu , W. Fu , X.G. Song , S.R. Yang , F. Long , S.P. Hu","doi":"10.1016/j.intermet.2025.108680","DOIUrl":"10.1016/j.intermet.2025.108680","url":null,"abstract":"<div><div>Brazing CoCrNi to GH99 is of great significance for manufacturing high-strength and lightweight structural components in thermal protection systems. BNi-5a amorphous filler was used to braze CoCrNi to GH99 in this study, and medium entropy brazing seams were obtained. The typical CoCrNi/BNi-5a/GH99 joint is composed of the brazing seam and diffusion zones on both sides of substrates. The main component of the brazing seam is a γ (Ni, Cr) solid solution, with CrB and borides on CoCrNi side and GH99 side, respectively. Increasing the brazing temperature and prolonging the holding time can promote atomic diffusion and form more precipitates in diffusion zones on both sides, but the microstructure of the joints tends to homogenize under excessively high temperature or longer holding time. The joints obtained at the parameter of 1210 °C/10 min reach the maximum shear strength of 557 MPa. The brazing seam has outstanding effects similar to those of medium and high entropy alloys, leading to excellent mechanical properties. Most joints exhibit a mixed mode of cleavage fracture and microvoid coalescence fracture, and fracture occurs at the brazing seam. EBSD analysis reveals that the deformation of CoCrNi base material is greater than that of the brazing seam after shear test. ∑3 twins and low-angle grain boundaries are formed in CoCrNi substrate, and cracks propagate along the grain boundaries in the brazing seam.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108680"},"PeriodicalIF":4.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First-order reversal curve analysis of rapid-solidified Co78Zr17B2Si1M2 (M= W, Cr, Mo) alloys 快速凝固的 Co78Zr17B2Si1M2（M= W、Cr、Mo）合金的一阶反向曲线分析

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-28 DOI: 10.1016/j.intermet.2025.108668

M. Molaahmadi, M. Tavoosi, A. Ghasemi

{"title":"First-order reversal curve analysis of rapid-solidified Co78Zr17B2Si1M2 (M= W, Cr, Mo) alloys","authors":"M. Molaahmadi, M. Tavoosi, A. Ghasemi","doi":"10.1016/j.intermet.2025.108668","DOIUrl":"10.1016/j.intermet.2025.108668","url":null,"abstract":"<div><div>This research focuses on first-order reversal curve (FORC) analysis of rapid-solidified Co<sub>78</sub>Zr<sub>17</sub>B<sub>2</sub>Si<sub>1</sub>M<sub>2</sub> (M = W, Cr, Mo) alloys. In this regard, vacuum arc melting and melt-spinning techniques were used to prepare the initial samples and the annealing process was carried out at temperature range of 400–700 °C. The prepared samples were analyzed using X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM) and FORC analysis. Based on the obtained results from the FORC analysis, the structure of Co<sub>78</sub>Zr<sub>17</sub>B<sub>2</sub>Si<sub>1</sub>M<sub>2</sub> (M = W, Cr, Mo) alloys after melt spinning process was combination of Co<sub>5</sub>Zr and amorphous phase. The optimum annealing temperature to achieve the best hard magnetic properties was shown to be 400 °C as a result of the formation of a single-phase compound of Co<sub>5</sub>Zr. The alloy containing Cr showed the highest coercivity (about 4.6 kOe), and the maximum coercivity for samples containing Mo and W was estimated to be about 3.4 kOe and 3.2 kOe, respectively.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108668"},"PeriodicalIF":4.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0