Intermetallics最新文献

Achieving excellent strength-ductility synergy in CoCrFeNi2Al0.3Ti0.25 high entropy alloy via analogous harmonic structure and dual-morphology L12 precipitates strengthening CoCrFeNi2Al0.3Ti0.25高熵合金通过类似谐波结构和双形态L12析出相强化实现了优异的强度-塑性协同效应

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-18 DOI: 10.1016/j.intermet.2025.108885

A.X. Li, K.W. Kang, J.S. Zhang, D. Huang, M.K. Xu, S.K. Liu, Y.T. Jiang, G. Li

{"title":"Achieving excellent strength-ductility synergy in CoCrFeNi2Al0.3Ti0.25 high entropy alloy via analogous harmonic structure and dual-morphology L12 precipitates strengthening","authors":"A.X. Li, K.W. Kang, J.S. Zhang, D. Huang, M.K. Xu, S.K. Liu, Y.T. Jiang, G. Li","doi":"10.1016/j.intermet.2025.108885","DOIUrl":"10.1016/j.intermet.2025.108885","url":null,"abstract":"<div><div>Achieving a superior combination of high strength and ductility in metallic materials remains a key challenge in materials science. In this study, we improve the strength-ductility synergy of a CoCrFeNi-based high entropy alloy (HEA) by designing an analogous harmonic structure via thermomechanical processing. Microstructural analysis reveals that a soft FCC matrix phase is surrounded by a hard L1<sub>2</sub> precipitate phase, forming a typical core-shell heterogeneous structure. The volume fractions of the core and shell regions are 62.8 % and 37.2 %, respectively. Tensile tests at room temperature demonstrate that the HS-HEA exhibits a yield strength of 1018 MPa, an ultimate tensile strength of 1433 MPa, and a total elongation of 29.0 %. The high yield strength arises from significant strain gradients in the core and shell regions, which induced hetero-deformation induced strengthening, grain boundary strengthening, and precipitation strengthening. Meanwhile, the excellent ductility is attributed to dislocation slip, deformation-induced stacking faults, and Lomer-Cottrel locks, with a minor contribution from deformation twins. These mechanisms collectively enhance work-hardening capacity, delaying plastic instability and enabling an exceptional strength-ductility balance. This research presents a novel approach to strengthening HEAs through analogous harmonic structure, which enhances hetero-deformation induced hardening in addition to traditional mechanisms. These findings provide critical insights for designing heterogeneous structural alloys with outstanding mechanical properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108885"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313804","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

Ultra-ductile and high-strength CoCrNi medium entropy alloy with directional grains via laser melting deposition 激光熔化沉积具有定向晶粒的超韧性高强CoCrNi中熵合金

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-18 DOI: 10.1016/j.intermet.2025.108884

Shijia Yin , Xiaoyi Li , Mingliang Wang, Abdukadir Amar, Yiping Lu

{"title":"Ultra-ductile and high-strength CoCrNi medium entropy alloy with directional grains via laser melting deposition","authors":"Shijia Yin , Xiaoyi Li , Mingliang Wang, Abdukadir Amar, Yiping Lu","doi":"10.1016/j.intermet.2025.108884","DOIUrl":"10.1016/j.intermet.2025.108884","url":null,"abstract":"<div><div>Laser melting deposition (LMD) involves large temperature gradients and rapid cooling, which enables microstructural refinement at the nanoscale to achieve high strength. However, LMD provides a high level of strength, often at the expense of ductility due to the refined microstructure and the introduced high density of dislocations. Herein, directional growth along the deposition direction (DD) was obtained by adjusting the process parameters of LMD to improve the strength and ductility of CoCrNi medium-entropy alloy (MEA). In comparison to the as-cast sample, the simultaneous increment in both strength and ductility is achieved by LMD along the DD. Especially, the ductility of the LMD sample tensile along the DD (ultimate tensile strain <em>ε</em><sub><em>U</em></sub> = 91 %) was superior to those of other additively manufactured MEAs and the state-of-the-art steels, which was mainly attributed to the reduced transverse grain boundary density and simplified orientation ([001]) of columnar grain, and the enhancement of work-hardening capacity due to the activation of a large number of stacking faults and twins during the deformation. This work provides a new possibility to achieve high-strength and ultra-ductile complex-shaped metallic parts via designing directional grains by LMD.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108884"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313805","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

Grain boundary interdiffusion in CoFeNi/Sn system: Analysis of phase growth and compositional complexity CoFeNi/Sn体系的晶界互扩散：相生长和成分复杂性分析

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-17 DOI: 10.1016/j.intermet.2025.108887

Bhawna Yadav , T.N. Prasanthi , K. Guruvidyathri , M. Sadhasivam , C. Sudha , K.G. Pradeep , M. Vaidya

{"title":"Grain boundary interdiffusion in CoFeNi/Sn system: Analysis of phase growth and compositional complexity","authors":"Bhawna Yadav , T.N. Prasanthi , K. Guruvidyathri , M. Sadhasivam , C. Sudha , K.G. Pradeep , M. Vaidya","doi":"10.1016/j.intermet.2025.108887","DOIUrl":"10.1016/j.intermet.2025.108887","url":null,"abstract":"<div><div>Grain boundary interdiffusion in the CoFeNi/Sn system is explored by investigating diffusion couples of coarse-grained (CG > 200 μm) and ultrafine-grained (UFG ∼800 nm) CoFeNi alloys with Sn in the temperature range 175–215 °C. The CG and UFG CoFeNi samples were prepared through vacuum arc melting (VAM) and spark plasma sintering (SPS) of mechanically alloyed CoFeNi powders, respectively. At 175 °C, formation of (Co, Ni)Sn<sub>3</sub> and FeSn<sub>2</sub> intermetallic phases is observed at both the interfaces. At 200 °C, (Co, Ni)Sn<sub>3</sub> and FeSn<sub>2</sub> persisted across annealing durations of 120, 180, and 240 h, with a gradual increase in their thickness. However, at 300 h, a phase mixture of (Co, Ni)Sn<sub>3</sub> and FeSn<sub>2</sub> emerged between the two single phase layers. At 215 °C, the presence of FeSn<sub>2</sub>, (Co, Ni)Sn<sub>3</sub>, and their phase mixture was observed consistently, with progressive thickening over time. Phase formation in the interdiffusion zone has been confirmed using correlative microscopy methods. Time dependent studies reveal the pronounced phase growth in UFG CoFeNi/Sn compared to CG CoFeNi/Sn. The accelerated diffusion kinetics at the UFG interface can be attributed to the higher fraction of grain boundaries (GBs). The comparison of CoFeNi/Sn diffusion couples with reported studies of Ni/Sn and CoNi/Sn reveal that the effect of enhanced GB fraction on kinetics is partially nullified by the compositional complexity of end members in the interdiffusion zone. The experimental data across the 175–215 °C range provide valuable insights that can aid in refining the phase diagram and expanding the available database for this multicomponent alloy system.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108887"},"PeriodicalIF":4.3,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306770","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

In-situ synthesized Ti5Si3-Ti2AlC reinforced TiAl composite with enhanced tribological properties 原位合成Ti5Si3-Ti2AlC增强TiAl复合材料的摩擦学性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-16 DOI: 10.1016/j.intermet.2025.108880

Yupeng Wang , Siying Li , Tengfei Ma , Xiaohong Wang , Qiaoyu Li , Yongzhe Wang , Hongze Fang , Ruirun Chen

{"title":"In-situ synthesized Ti5Si3-Ti2AlC reinforced TiAl composite with enhanced tribological properties","authors":"Yupeng Wang , Siying Li , Tengfei Ma , Xiaohong Wang , Qiaoyu Li , Yongzhe Wang , Hongze Fang , Ruirun Chen","doi":"10.1016/j.intermet.2025.108880","DOIUrl":"10.1016/j.intermet.2025.108880","url":null,"abstract":"<div><div>Herein, the TiAl composite with Ti<sub>5</sub>Si<sub>3</sub> and Ti<sub>2</sub>AlC particles reinforced was designed to improve its tribological properties at different temperatures, in which was in-situ fabricated by spark plasma sintering using Ti-48Al-2Nb-2Cr alloy with addition of SiC particles. Moreover, the Ti<sub>5</sub>Si<sub>3</sub> particles were predominantly distributed at the lamellar colony boundaries forming a discontinuous network structure, while Ti<sub>2</sub>AlC particles primarily precipitate at the interfaces of α<sub>2</sub>/γ lamellae. The tribological results exhibited the friction coefficient of TiAl composite was lower than that of TiAl alloy at room-temperature and elevated temperatures (650, 750, and 850 °C). The friction coefficients were 0.48 and 0.54 for TiAl composite at room-temperature and 850 °C, reduced by 21.3 % and 12.9 % compared to TiAl alloy. However, the wear rate was reversed at 750 and 850 °C indicating the change of wear mechanism. The abrasive and ploughing wear transform to plastic deformation, oxidation wear and adhesive wear at 650 °C for pure TiAl alloy, and the transformation temperature was 750 °C for TiAl composite. It revealed that TiAl composite showed superior wear resistance at different temperatures, which mainly attributed to the Ti<sub>5</sub>Si<sub>3</sub>–Ti<sub>2</sub>AlC particles refined microstructure and enhanced microhardness, strength, and oxidation resistance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108880"},"PeriodicalIF":4.3,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290524","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 aging time on multiphase microstructure and high-temperature creep properties of weldable Ni3Al-based alloy with ultrafine β phase 时效时间对具有超细β相可焊ni3al基合金多相组织和高温蠕变性能的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-16 DOI: 10.1016/j.intermet.2025.108881

Jing Wu , Peichang Zhang , Jinlong Liu , Weichao Wang , Yatao Du , Junting Luo , Shiyou Gao , Chong Li , Yongchang Liu

{"title":"Effect of aging time on multiphase microstructure and high-temperature creep properties of weldable Ni3Al-based alloy with ultrafine β phase","authors":"Jing Wu , Peichang Zhang , Jinlong Liu , Weichao Wang , Yatao Du , Junting Luo , Shiyou Gao , Chong Li , Yongchang Liu","doi":"10.1016/j.intermet.2025.108881","DOIUrl":"10.1016/j.intermet.2025.108881","url":null,"abstract":"<div><div>Laser remelting provides a novel approach to refine multiphase strengthening structure in weldable Ni<sub>3</sub>Al-based alloy (particularly for β phase), significantly improving the creep property. However, the ultrafine multiphase strengthening structure evolution and creep performance in laser remelted alloy were still uncertain during heat treatment. In this paper, the evolution of ultrafine multiphase strengthening structure at 980 °C for 200–1100 h and high-temperature creep properties at 1000 °C/120 MPa in weldable Ni<sub>3</sub>Al-based alloy with ultrafine β were investigated. Meantime, the relationship between evolution of ultrafine multiphase strengthening structure and creep properties was revealed. The findings show that rapid transformation of near-spherical γ′ phase (laser remelted) into cubic γ′ phase (200 h), growth (500 h), R-type γ′ rafting structure (800 h) and coarsened (1100 h) in ultrafine γ′+γ dendrite of the alloy were promoted by 980 °C for 200–1100 h high-temperature aging treatment, which significantly reducing steady-state creep rate in different aged alloys. Meanwhile, the dissolution and growth of ultrafine β phase lead to size from 0.81 μm to 1.64–2.28 μm and volume fraction from 13.61 % to 5.03 %–4.07 %. This is accompanied by the improvement of morphology distribution, from long strip discontinuous network bad distribution to the near-spherical dispersion uniform distribution, which significantly improves accelerated creep stage life of alloy. Among them, the 1100 h aged alloy had the highest creep life of 137 h and lowest steady-state creep rate of 0.01086 %/h at 1000 °C/120 MPa.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108881"},"PeriodicalIF":4.3,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297807","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

On the evolution mechanism of AlTM intermetallics in Mg melt via reverse peritectic reactions 镁熔体中AlTM金属间化合物通过反向包晶反应的演化机理研究

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-16 DOI: 10.1016/j.intermet.2025.108879

Hongfu Su, Tong Gao, Xiangfa Liu

引用次数: 0

Effect of Si on the microstructure and corrosion behavior of AlCrFeNiNbSix HEA coating fabricated by laser cladding Si对激光熔覆AlCrFeNiNbSix HEA涂层组织和腐蚀行为的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-16 DOI: 10.1016/j.intermet.2025.108882

Xiujie Xia , Jing Liu , Yuanxu Duan , Zhepeng Song , Jian Zhang

{"title":"Effect of Si on the microstructure and corrosion behavior of AlCrFeNiNbSix HEA coating fabricated by laser cladding","authors":"Xiujie Xia , Jing Liu , Yuanxu Duan , Zhepeng Song , Jian Zhang","doi":"10.1016/j.intermet.2025.108882","DOIUrl":"10.1016/j.intermet.2025.108882","url":null,"abstract":"<div><div>AlCrFeNiNbSi<sub>x</sub> (x = 0, 0.4, 0.8) HEA coatings were fabricated on 304SS substrate using laser cladding technology. The influence of Si on the microstructure and corrosion behavior of the coatings was investigated. The findings revealed that all the designed coatings exhibited typical dendritic and interdendritic microstructure. The introduction of Si led to grain refinement, with the average grain size decreasing from 8.36 μm (Si0) to 5.02 μm (Si0.4). Phase analysis indicated that the Si0 coating consisted of BCC, FCC, and Laves phase, while the Si-containing AlCrFeNiNbSi<sub>x</sub> coatings developed Fe<sub>4</sub>Nb<sub>4</sub>Si phase accompanied by a marked reduction in Laves phase. The electrochemical test results indicated that the corrosion resistance of all the AlCrFeNiNbSi<sub>x</sub> coatings surpassed that of 304SS. Appropriate amount of Si can balance the microstructure uniformity and passivation behavior of the alloy. Among them, the Si0.4 coating showed the best corrosion resistance. The incorporation of Si element can facilitate the formation of the stable oxides, such as SiO<sub>2</sub> and Cr<sub>2</sub>O<sub>3</sub>, which can synergistically construct a dense composite passivation film that effectively inhibited the penetration of the corrosive ions.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108882"},"PeriodicalIF":4.3,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297808","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

Dynamic compression behavior of single-phase and dual-phase Fe-rich medium-entropy alloys 单相和双相富铁中熵合金的动态压缩行为

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-14 DOI: 10.1016/j.intermet.2025.108871

Chengfu Han, Zhenyu Du, Ran Wei, Yongfu Cai, Tan Wang, Chen Chen, Shaojie Wu, Fushan Li

{"title":"Dynamic compression behavior of single-phase and dual-phase Fe-rich medium-entropy alloys","authors":"Chengfu Han, Zhenyu Du, Ran Wei, Yongfu Cai, Tan Wang, Chen Chen, Shaojie Wu, Fushan Li","doi":"10.1016/j.intermet.2025.108871","DOIUrl":"10.1016/j.intermet.2025.108871","url":null,"abstract":"<div><div>The compressive mechanical behavior and deformation mechanisms of Fe-rich medium-entropy alloys with different phase structures were investigated under quasi-static (10<sup>−4</sup> - 10<sup>−2</sup> s<sup>−1</sup>) and high strain rates (1500 - 6000 s<sup>−1</sup>) conditions. The results indicated that no fractures or cracks occurred in any of the compressed specimens of the single-phase Fe<sub>57</sub>Ni<sub>18</sub>Cr<sub>15</sub>Si<sub>7</sub>Al<sub>3</sub> and dual-phase Fe<sub>62</sub>Ni<sub>13</sub>Cr<sub>15</sub>Si<sub>7</sub>Al<sub>3</sub> alloys. Under quasi-static conditions, both alloys exhibited low strain rate sensitivity, with deformation primarily characterized by high-density dislocations and minimal deformation twins or stacking faults. At high strain rates, the yield strength increased significantly. The strain rate sensitivity coefficients (<em>m</em><sub><em>d</em></sub>) for the single-phase and dual-phase alloys were 0.081 and 0.089, respectively. In the single-phase alloy, deformation was accompanied by high-density dislocations, deformation twins, and the presence of deformed NiAl precipitates. The dual phase alloy exhibited a more pronounced transformation-induced plasticity effect. At a strain rate of 6000 s<sup>−1</sup>, the adiabatic temperature rise reached 178 K for the single-phase alloy and 149 K for the dual-phase alloy. These findings indicated that Fe-rich medium-entropy alloys possessed excellent strength and plasticity under high strain rates, ensuring their reliability in dynamic impact environments.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108871"},"PeriodicalIF":4.3,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288886","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

Dynamic recrystallization behavior of a novel duplex Ni-W-Co-Mo medium-heavy alloy 新型双相Ni-W-Co-Mo中重合金的动态再结晶行为

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-13 DOI: 10.1016/j.intermet.2025.108837

Wannian Wang , Zhanxing Chen , Tengfei Ma , Xinfang Zhang , Xiaohong Wang , Yajun Yin , Jianxin Zhou , Hongze Fang

{"title":"Dynamic recrystallization behavior of a novel duplex Ni-W-Co-Mo medium-heavy alloy","authors":"Wannian Wang , Zhanxing Chen , Tengfei Ma , Xinfang Zhang , Xiaohong Wang , Yajun Yin , Jianxin Zhou , Hongze Fang","doi":"10.1016/j.intermet.2025.108837","DOIUrl":"10.1016/j.intermet.2025.108837","url":null,"abstract":"<div><div>The hot deformation behavior of a novel duplex Ni-42W-10Co-10Mo (wt.%) medium-heavy alloy (MHA) was studied using Gleeble-3800 within temperature ranging from 1150 °C to 1300 °C under strain rates of 0.001–1 s<sup>−1</sup>. The as-cast alloy exhibited a hypoeutectic microstructure, characterized by a face-centered cubic matrix and μ phase distributed in the inter-dendritic regions. The hot deformation activation energy was determined to be 855.6 kJ/mol, primarily due to the precipitation of secondary μ phases during deformation. The μ phase alloys showed a positive effect on dynamic recrystallization (DRX), Particle-stimulated nucleation (PSN) provided numerous nucleation sites for DRX, while the pinning effect of the μ phase inhibited grain growth, leading to formation of a fine-grained microstructure. Furthermore, a strain-induced boundary migration (SIBM) nucleation mechanism was observed in the alloy. The combined effects of PSN and SIBM facilitated formation of refined dynamic recrystallized grains. The hot deformation window of Ni-42W-10Co-10Mo MHA was determined as deformation temperature of 1200 °C under strain rates of 0.01–0.1 s<sup>−1</sup> based on hot processing map and microstructural evolution.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108837"},"PeriodicalIF":4.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271113","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

Simultaneous enhancement of strength and toughness in TiAl composites via ductile Nb particle addition 通过添加延展性Nb颗粒同时增强TiAl复合材料的强度和韧性

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-13 DOI: 10.1016/j.intermet.2025.108878

Jiangfei Yan , Dongdong Zhu , Duo Dong , QiBin Wang , Maoliang Hu , Ye Wang

{"title":"Simultaneous enhancement of strength and toughness in TiAl composites via ductile Nb particle addition","authors":"Jiangfei Yan , Dongdong Zhu , Duo Dong , QiBin Wang , Maoliang Hu , Ye Wang","doi":"10.1016/j.intermet.2025.108878","DOIUrl":"10.1016/j.intermet.2025.108878","url":null,"abstract":"<div><div>Enhancing the toughness of TiAl alloys remains a critical problem urgently requiring resolution. This study demonstrates that the incorporation of 5 vol% ductile Nb particles into the Ti-45Al-8Nb matrix via the spark plasma sintering (SPS) technique simultaneously enhances strength and toughness. The microstructure evolution at the interface between the Nb particles and the matrix was investigated, while the micro-mechanical properties of the interface phases and the toughening mechanisms were analyzed. The results indicate that a multi-layer interface structure is formed between Nb particles and TiAl powders through atomic diffusion reactions involving Nbr/σ/σ+B2/B2+γ/matrix zones. The (B2+γ) reaction layer achieves a gradient transformation of the elastic modulus between the residual Nb particles and the matrix (165 GPa→150 GPa→147 GPa→140 GPa), thereby alleviating the deformation inhomogeneity at the interface. The Nb/TiAl composite prepared at 1250 °C exhibits excellent room-temperature compressive strength (2417 MPa) and fracture toughness (16.85 MPa m<sup>1/2</sup>), representing 14.8 % and 13.1 % enhancements compared to pure Ti-45Al-8Nb alloy. These enhancements primarily originate from plastic tearing, interfacial debonding, and bridging of the residual Nb particles. The tough B2 and γ phases in the Nb-rich region improve toughness by reducing fracture energy through crack deflection and branching.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108878"},"PeriodicalIF":4.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280488","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