Intermetallics最新文献_第5页

Effect of vanadium content on microstructure, mechanical properties, and oxidation behavior of novel high temperature complex alloy

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-23 DOI: 10.1016/j.intermet.2025.108672

P. Jangra, A.R. Balpande, S.S. Nene

{"title":"Effect of vanadium content on microstructure, mechanical properties, and oxidation behavior of novel high temperature complex alloy","authors":"P. Jangra, A.R. Balpande, S.S. Nene","doi":"10.1016/j.intermet.2025.108672","DOIUrl":"10.1016/j.intermet.2025.108672","url":null,"abstract":"<div><div>Introducing vanadium (V) in high temperature alloys reduces density and increases its high temperature strength. However, the effect of V on the high temperature oxidation behavior is debatable and hence unclear. In line with that, here we developed Co<sub>30</sub>Ni<sub>45-x</sub>V<sub>x</sub>Cr<sub>15</sub>Fe<sub>5</sub>Si<sub>5</sub> (at. %) (x = 5, 10, 15, 20, 25, 30) high temperature complex alloys (HT-CAs) (all elements in at. %.) with varying V content and studied its effect on microstructure, mechanical properties and high temperature oxidation behavior (for prolonged exposure of 96 h at 1050 °C) systematically. Microstructural evolution as a function of V content shows a steady transition from single phase f.c.c. structure to multi-phase structure beyond 15 at. % with good compressive formability (ε > 50 %) whereas oxide layer thickness displayed an exponential rise beyond 10 at. % of V with a gradual increase in weight gain upon oxidation. The increased layer thickness (>350 μm) and weight gain (>45 mg/cm<sup>2</sup>) after oxidation beyond 10 at. % V in these alloys is attributed to the increased V content in the oxide layer suggesting its higher reactivity with oxygen during high temperature exposure. Thus, higher V in the HT-CAs could be detrimental from mechanical properties and oxidation resistance perspectives, hence its content needs to be tailored to minimize the oxidation losses and maximize the component life during service.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108672"},"PeriodicalIF":4.3,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181221","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

Mechanical properties and high temperature structure evolution of FeCrAlMoNb high entropy alloy coatings with different Mo contents for accident tolerant fuel cladding

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-22 DOI: 10.1016/j.intermet.2025.108670

Sujuan Liu , Yu Wang , Miao Deng , Chunhai Liu , Jingyi Liang , Jun Yi , Weiwei Xiao

引用次数: 0

Achieving ultrahigh strength and good ductility in a Al5Co21Fe21Mn17Ni36 high-entropy alloy with BCC and FCC crystals 在具有 BCC 和 FCC 晶体的 Al5Co21Fe21Mn17Ni36 高熵合金中实现超高强度和良好延展性

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-21 DOI: 10.1016/j.intermet.2025.108667

M.Z. Wang , Y.F. Shen , W.Y. Xue

引用次数: 0

Research on flow stress behavior, constitutive modeling, processing mapping and microstructure evolution of as-cast Ti-6Mo-4Al-4Zr-3Nb-2Cr-1Fe alloy during hot deformation in (α+β) region

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-20 DOI: 10.1016/j.intermet.2025.108637

Yili Li , Hongze Fang , Ruirun Chen , Shichen Sun , Baohui Zhu , Xiang Xue

{"title":"Research on flow stress behavior, constitutive modeling, processing mapping and microstructure evolution of as-cast Ti-6Mo-4Al-4Zr-3Nb-2Cr-1Fe alloy during hot deformation in (α+β) region","authors":"Yili Li , Hongze Fang , Ruirun Chen , Shichen Sun , Baohui Zhu , Xiang Xue","doi":"10.1016/j.intermet.2025.108637","DOIUrl":"10.1016/j.intermet.2025.108637","url":null,"abstract":"<div><div>To investigate the hot deformation behavior and the microstructure evolution of Ti644321 alloy in α+β region, the hot compression tests were conducted within the temperature range from 720 to 810 °C and strain rate from 0.001 to 1 s<sup>−1</sup>. The as-cast Ti alloy mainly consists of coarse equiaxed β phases. During the thermal deformation of alloys in the (α+β) region, lots of α phase precipitates. At lower strain rates, the microstructure consists of fine spherical or short rod-shaped α phase embedded within the β matrix. This indicates that under thermal deformation conditions, the α phase undergoes spheroidization, which is caused by the wedging of β phase. At high strain rates, dynamic recrystallization is difficult to occur due to insufficient time consumption or sustained generation of dislocations. With the increase of deformation temperature, the number of primary α phases decreases, and the size also slightly increases. The relationship between microstructural characteristics and power dissipation efficiency (<em>η</em>) is established through the analysis of the hot processing map and corroborated by microstructural observations. Flow localizations and lamellar kinking of α phase appear in the instability region. The optimal processing parameters for Ti644321 alloy are in the medium temperature (740–770 °C) and the low strain rate (0.001–0.03 s<sup>−1</sup>). The dynamic recovery of β phase and the spheroidization of α phase are the main softening mechanisms in this area.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108637"},"PeriodicalIF":4.3,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181228","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

The strain rate effect on strength behavior of CoCrNi medium entropy alloy up to 106 s−1

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-18 DOI: 10.1016/j.intermet.2025.108665

Jinlei Dong , Xuemiao Chen , Xuping Zhang , Guiji Wang , Zhikai Fu , Zhihao Fang , Guan Wang , Binqiang Luo , Fuli Tan , Jianheng Zhao , Chengwei Sun

{"title":"The strain rate effect on strength behavior of CoCrNi medium entropy alloy up to 106 s−1","authors":"Jinlei Dong , Xuemiao Chen , Xuping Zhang , Guiji Wang , Zhikai Fu , Zhihao Fang , Guan Wang , Binqiang Luo , Fuli Tan , Jianheng Zhao , Chengwei Sun","doi":"10.1016/j.intermet.2025.108665","DOIUrl":"10.1016/j.intermet.2025.108665","url":null,"abstract":"<div><div>It is of great scientific significance and application value to reveal and understand the multi-scale mechanical properties and deformation mechanisms of medium entropy alloys (MEAs) under wide strain rates and high pressures. In this work, we systemically investigated the mechanical behaviors and underlying mechanisms of CoCrNi MEA and their connections under strain rates from 10<sup>−3</sup> s<sup>−1</sup> to 10<sup>6</sup> s<sup>−1</sup> and high pressures to about 22 GPa by experiments and simulations. The compression mechanical behaviors and microstructure characteristics were obtained by means of multiple loadings and characterization methods. As the strain rate increases, the experimental results showed two distinct dependences between yield strength and strain rates. Specifically, the strain rate sensitivity (SRS) of the yield strength transitions from 0.085 at low strain rates (1.0 × 10<sup>−3</sup> s<sup>−1</sup>-1.0 × 10<sup>−1</sup> s<sup>−1</sup>) to 0.14 at high strain rates (2.6 × 10<sup>3</sup> s<sup>−1</sup>-1.48 × 10<sup>6</sup> s<sup>−1</sup>). Based on these, we utilized a crystal plasticity (CP) model and revealed that this transition of SRS is related to the mechanism transition from dislocation nucleation and slip at low strain rates to massive dislocation nucleation and drag at high strain rates. Our study provides a valuable framework for characterizing the dynamic mechanical behaviors of MEAs under a wider range of strain rates, guiding the design of MEAs with excellent dynamic mechanical properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108665"},"PeriodicalIF":4.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182228","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

Effect of V addition on the microstructure and wear resistance of CoCrFeNiNb high-entropy alloy laser cladding layers

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-18 DOI: 10.1016/j.intermet.2025.108654

Chenxiao Song , Wei Zhao , Jinpeng Bi , Shuai Li , Hairui Gao , Hui Zhang , Song Gao , Yuexia Lv , Weifeng Rao

{"title":"Effect of V addition on the microstructure and wear resistance of CoCrFeNiNb high-entropy alloy laser cladding layers","authors":"Chenxiao Song , Wei Zhao , Jinpeng Bi , Shuai Li , Hairui Gao , Hui Zhang , Song Gao , Yuexia Lv , Weifeng Rao","doi":"10.1016/j.intermet.2025.108654","DOIUrl":"10.1016/j.intermet.2025.108654","url":null,"abstract":"<div><div>In this study, CoCrFeNiNbV<sub>x</sub> (x = 0, 0.5, 1, 1.5) high-entropy alloy (HEA) laser cladding layers were fabricated to investigate the effects of V content on the microstructure evolution, as well as room-temperature and high-temperature wear resistance of the cladding layers. It was found that all cladding layers exhibited a typical hypereutectic morphology. With increasing x, the stability of the FCC phase decreased, gradually transitioning from FCC phase + Laves phase (primary Laves phase + secondary Laves phase) + NbC to BCC phase + Laves phase (primary Laves phase + secondary Laves phase). At x = 1, the primary Laves phase accounted for 41.6 % of the structure and exhibited optimal size uniformity. Compared to DT4 industrial pure iron, the microhardness of the cladding layers was significantly improved, which can be attributed to the combined effects of second-phase strengthening, solid solution strengthening and dispersion strengthening. As x increased, the microhardness, room-temperature wear resistance, and high-temperature wear resistance of the cladding layers initially increased and then decreased, reaching optimal values at x = 1, where they were 1.61, 7.04, and 7.40 times higher than those at x = 0, respectively. The improvement in room-temperature wear resistance can be attributed to the increased Laves phase content and the formation of Fe-, V-, and Nb-enriched oxide layers. The enhancement in high-temperature wear resistance is due to the increased Laves phase content and the lubricating effect of V<sub>x</sub>O<sub>y</sub>. The addition of V significantly improves the properties of high-entropy alloys and provides an effective approach for preparing cladding layers with good wear resistance and high-temperature wear resistance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108654"},"PeriodicalIF":4.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180809","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

The effect of cellular reaction on mechanical behavior and microstructure evolution of β-solidified γ-TiAl based alloy during hot deformation 热变形过程中蜂窝反应对β固化γ-TiAl基合金力学行为和微观结构演变的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-17 DOI: 10.1016/j.intermet.2025.108653

V.S. Sokolovsky , N.D. Stepanov , G.A. Salishchev

{"title":"The effect of cellular reaction on mechanical behavior and microstructure evolution of β-solidified γ-TiAl based alloy during hot deformation","authors":"V.S. Sokolovsky , N.D. Stepanov , G.A. Salishchev","doi":"10.1016/j.intermet.2025.108653","DOIUrl":"10.1016/j.intermet.2025.108653","url":null,"abstract":"<div><div>In this work, the effect of cellular reaction on the mechanical behavior and evolution of the microstructure of the Ti-43.2Al-1.9V-1.1Nb-1.0Zr-0.2Gd-0.2B (at.%) alloy during uniaxial compression at Т = 1050 °C, έ = 10<sup>−3</sup> s<sup>−1</sup> and ɛ = 70 %. The lamellar (HT1) and metastable α<sub>2</sub>-grain (HT2) initial structures were produced by heat treatment and used as starting materials. Heating to the deformation temperature of the HT1 condition has not resulted in any noticeable changes in the microstructure, while HT2 microstructure transforms to (α<sub>2</sub>+γ) nanolamellar colonies alongside with development of a cellular reaction with the formation of coarse lamellar colonies. In the HT2 state, compared to HT1, the flow stresses are significantly reduced and the nature of the mechanical behavior changes. This behavior was associated with the localization of plastic flow in coarse lamellar colonies, and the development of recrystallization and spheroidization processes in them. By the final stage of deformation, the proportion of recrystallized/spheroidized structure increases in the HT2 state to 87 %, while in HT1 it is only 50 %. Mechanical behavior, structural evolution, and plastic deformation mechanisms are discussed.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108653"},"PeriodicalIF":4.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182227","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 compressive mechanical properties of BCC structured (NbTi)100-x(CrAl)x medium-entropy alloys BCC 结构 (NbTi)100-x(CrAl)x 中熵合金的微观结构和压缩机械性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-16 DOI: 10.1016/j.intermet.2025.108651

Ji-Won Kim , Sang-Kyu Yoo , Dong-Hyun Lee , In-Chul Choi

{"title":"Microstructure and compressive mechanical properties of BCC structured (NbTi)100-x(CrAl)x medium-entropy alloys","authors":"Ji-Won Kim , Sang-Kyu Yoo , Dong-Hyun Lee , In-Chul Choi","doi":"10.1016/j.intermet.2025.108651","DOIUrl":"10.1016/j.intermet.2025.108651","url":null,"abstract":"<div><div>To obtain a medium-entropy alloy (MEA) having a body-centered cubic (BCC) structure with relatively high specific strength and room-temperature fracture strain, a NbTiCrAl alloy is manufactured by the vacuum arc melting method. The NbTiCrAl alloy is developed by adding Ti to improve elongation and reduce weight, Al to enhance strength and reduce weight, and Cr to increase oxidation resistance. However, Al and Cr can form intermetallic compounds, which may reduce the mechanical properties of the alloy. To optimize strength and fracture strain, the contents of Al and Cr are varied. All the (NbTi)<sub>100-x</sub>(CrAl)<sub>x</sub> alloys, except those with more than 40 at.% Al and Cr, exhibit a BCC solid solution phase as a main phase. As the Al and Cr contents increase to 50 at.%, the short-range ordered B2 phase and the intermetallic compound Laves C14 phase are coexisted, as confirmed by microstructural analysis. The room temperature compression test results show that the yield strength improves without compromising fracture strain when the Cr and Al contents increase. However, when the total Cr and Al contents exceed 40 at.%, the short-range ordered B2 and Laves C14 phases coexist within the BCC matrix, resulting in catastrophic failure. Finally, in the (NbTi)<sub>100-x</sub>(CrAl)<sub>x</sub> alloys, (NbTi)<sub>70</sub>(CrAl)<sub>30</sub> MEA exhibits the best properties in terms of specific yield strength and fracture strain.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108651"},"PeriodicalIF":4.3,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182229","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

Balancing κ-formation and γ-recrystallization towards exceptional mechanical properties in a NiCoV0.9 medium entropy alloy

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-16 DOI: 10.1016/j.intermet.2025.108666

Yuxin Zhang , Junyang He , Weijin Cai , Na Li , Zipan Chen , Xiangqi Xu , Yang Chen , Zhixiang Qi , Gong Zheng , Daixiu Wei , Xinrong Tan , Min Song

{"title":"Balancing κ-formation and γ-recrystallization towards exceptional mechanical properties in a NiCoV0.9 medium entropy alloy","authors":"Yuxin Zhang , Junyang He , Weijin Cai , Na Li , Zipan Chen , Xiangqi Xu , Yang Chen , Zhixiang Qi , Gong Zheng , Daixiu Wei , Xinrong Tan , Min Song","doi":"10.1016/j.intermet.2025.108666","DOIUrl":"10.1016/j.intermet.2025.108666","url":null,"abstract":"<div><div>In this work, by lowering the V amount, two thermodynamic processes, i.e., κ-formation and γ-recrystallization, are near-concurrently activated in a NiCoV0.9 medium entropy alloy (MEA) during 900 °C annealing. The NiCoV0.9 MEA with only 2 min annealing inherits the high strength from the cold-rolling structure while regains apparent work-hardening, endowing the alloy at this state with excellent strength-ductility synergy. By utilizing correlated observation methods, it is found that in the very beginning of annealing, γ-recrystallization occurs closely prior to κ transformation, which in turn enables elemental redistribution needed for κ growth. Further in-situ synchrotron high-energy X-ray diffraction reveals the synchronous onset of plastic deformation in both κ and γ, suggesting the good deformability of κ regardless of its hard nature. With prolonged annealing at 900 °C, the yield strength drops sharply yet the ductility is not further enhanced. This is likely due to the fast increment in both size and volume fraction of the κ phase that significantly raises the cracking sensitivity.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108666"},"PeriodicalIF":4.3,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182222","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

A novel antioxidant strategy for refractory high-entropy alloys utilizing element diffusion along an ultrafine lamellar microstructure

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-01-16 DOI: 10.1016/j.intermet.2025.108649

Bohang Shen , Ruixin Wang , Shun Li , Li'an Zhu , Yu Tang , Hong Luo , Shuxin Bai

{"title":"A novel antioxidant strategy for refractory high-entropy alloys utilizing element diffusion along an ultrafine lamellar microstructure","authors":"Bohang Shen , Ruixin Wang , Shun Li , Li'an Zhu , Yu Tang , Hong Luo , Shuxin Bai","doi":"10.1016/j.intermet.2025.108649","DOIUrl":"10.1016/j.intermet.2025.108649","url":null,"abstract":"<div><div>High-temperature oxidation poses a significant challenge in applications such as aviation and turbines. While refractory high-entropy alloys maintain good strength at elevated temperatures, their resistance to high-temperature oxidation remains problematic. To explore an antioxidant strategy for refractory high-entropy alloys, the oxidation behaviour of Ti2ZrNbNi3 with an ultrafine body-centered cubic disordered and ordered solution (BCC + B2) lamellar microstructure was studied at different temperatures. When the oxidation temperature is greater than 800 °C, O atoms diffuse inwards along the boundaries of the ultrafine lamella and combine with Zr and Ti to generate low-valent oxides. With increasing time, high-valent oxides of Zr and Ti are generated, and Ni atoms originally belonging to the B2 phase can diffuse outwards and then form a dense NiO antioxidation layer. As the oxide rate of Ti2ZrNbNi3 is as low as that of pure Ni, the effectiveness of an antioxidation strategy utilizing elemental diffusion along an ultrafine lamellar microstructure has been demonstrated.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108649"},"PeriodicalIF":4.3,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182217","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