Tribology International最新文献_第3页

Enhanced fretting wear resistance of 2A12 aluminium alloys through laser shock peening without coating

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-19 DOI: 10.1016/j.triboint.2025.110646

He Gengchao , Guo Weiling , Zhou Longlong , Li Ke , Huang Yanfei , Wang Haidou , Cai Zhenbing , Xing Zhiguo

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Study on the tribological behavior of Ti-6Al-4V under emulsion lubrication with different oil-water ratio

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-19 DOI: 10.1016/j.triboint.2025.110653

Zhao Zhang , Yanyan Yan , Yangyang Ding , Zhankui Wang

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Letter to the editor regarding wrong nanoindentation measurements in the article by L. Zhang et al.

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-19 DOI: 10.1016/j.triboint.2025.110663

Esteban Broitman

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Gradient distribution of reinforced phases B2 and Ti5Si3 enabling tribocorrosion optimization in titanium alloy

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-19 DOI: 10.1016/j.triboint.2025.110659

Chonghao Sun , Luyuan Li , Haoran Li , Yongnan Chen , Ying Ruan

{"title":"Gradient distribution of reinforced phases B2 and Ti5Si3 enabling tribocorrosion optimization in titanium alloy","authors":"Chonghao Sun , Luyuan Li , Haoran Li , Yongnan Chen , Ying Ruan","doi":"10.1016/j.triboint.2025.110659","DOIUrl":"10.1016/j.triboint.2025.110659","url":null,"abstract":"<div><div>The distribution of Ti<sub>5</sub>Si<sub>3</sub> and B2 phases in the Ti-Al-Mo-Si alloys was controlled via electromagnetic levitation coupled with fall casting (EML-FC) technique. The B2 and Ti<sub>5</sub>Si<sub>3</sub> phases as reinforced phases exhibited improved wear resistance, passivation and repassivation capability compared to other constituent phases in the alloy. The volume fraction of these two phases in the Ti<sub>50</sub>Al<sub>42</sub>Mo<sub>4</sub>Si<sub>4</sub> alloy was higher than that in the Ti<sub>50</sub>Al<sub>46</sub>Mo<sub>2</sub>Si<sub>2</sub> alloy owing to the increase of Mo and Si content. The distribution of these two phases can be further controlled by the EML-FC process to form the gradient distribution with increasing volume fraction from edge to center in alloys. This facilitated the rapid formation of a dense passivation film and caused the gradient corrosion behavior of the alloys to effectively prevent the entire alloy from being corroded. The denser passivation film on the surface of Ti<sub>50</sub>Al<sub>42</sub>Mo<sub>4</sub>Si<sub>4</sub> alloy by EML-FC mixed with wear debris and formed a friction film on the alloy surface to provide more effective protection and lubrication for the matrix during tribocorrosion. Moreover, the gradient distribution with the higher volume fraction of B2 and Ti<sub>5</sub>Si<sub>3</sub> phases in the Ti<sub>50</sub>Al<sub>42</sub>Mo<sub>4</sub>Si<sub>4</sub> alloy significantly restrained pulling out of the alloy matrix, caused Ti<sub>5</sub>Si<sub>3</sub> and B2 phases to be oxidized to reduce wear on the matrix and effectively enhanced repassivation ability under tribocorrosion condition. Consequently, the corrosion and tribocorrosion resistances of the Ti-Al-Mo-Si alloys were improved.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"208 ","pages":"Article 110659"},"PeriodicalIF":6.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An investigation of film formation and pressure-viscosity relationship of water-based lubricants in elastohydrodynamic contacts

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-19 DOI: 10.1016/j.triboint.2025.110654

Mushfiq Hasan , Marcus Björling , Christine Matta , Ralph Meeuwenoord , Ugo Jantel , Roland Larsson

{"title":"An investigation of film formation and pressure-viscosity relationship of water-based lubricants in elastohydrodynamic contacts","authors":"Mushfiq Hasan , Marcus Björling , Christine Matta , Ralph Meeuwenoord , Ugo Jantel , Roland Larsson","doi":"10.1016/j.triboint.2025.110654","DOIUrl":"10.1016/j.triboint.2025.110654","url":null,"abstract":"<div><div>Understanding elastohydrodynamic (EHL) film formation and the pressure-viscosity response of lubricants is necessary for designing rolling/sliding tribological contacts. This article investigates the EHL behaviour of four formulated water-based lubricants (glycerol-water, glycol-water, and ionic liquid-water) and one reference oil under moderately high pressures, typical in gears and bearings applications. A ball-on-disc tribometer with optical interferometry was employed to measure the film thickness of the water-based lubricants. The results highlight the sensitivity of film formation to entrainment speed, slide-to-roll ratio (SRR), temperature, and lubricant composition. Water loss due to evaporation significantly impacts film formation at high temperatures. Additionally, an unusual increase in film thickness was observed for the glycol-water solution, likely due to complex tribological conditions. The limitations of the classical Hamrock-Dowson film thickness equation for water-based lubricants are also discussed. Furthermore, pressure-viscosity coefficients of the water-based lubricants were estimated using both optical interferometry and high-pressure viscometer methods. The effect of water content on the pressure-viscosity coefficient was also examined, revealing that higher water content leads to reduced pressure and temperature dependence of viscosity.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"208 ","pages":"Article 110654"},"PeriodicalIF":6.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Runner-ice friction models for winter olympic bobsleigh

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-18 DOI: 10.1016/j.triboint.2025.110650

Xiangle Kong , Deping Wang , Xiaoyu Zhou , Jianxiang Zhang , Xuan Niu , Yongfeng Jiang , Minghui Bai , Lun Li , Jun Li , Jianfeng Wang , Weihua Li

引用次数: 0

Microstructure and wear behavior of Mn-modified high-strength AlCu alloy fabricated via laser powder bed fusion

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-18 DOI: 10.1016/j.triboint.2025.110660

Zehao Qin , Nan Kang , Ruidi Li , Wenling Zhang , Mohamed El Mansori

{"title":"Microstructure and wear behavior of Mn-modified high-strength AlCu alloy fabricated via laser powder bed fusion","authors":"Zehao Qin , Nan Kang , Ruidi Li , Wenling Zhang , Mohamed El Mansori","doi":"10.1016/j.triboint.2025.110660","DOIUrl":"10.1016/j.triboint.2025.110660","url":null,"abstract":"<div><div>In this work, a new Mn-modified Al<img>Cu<img>Mg<img>Si<img>Ti alloy with a high relative density of 99.5 % was processed via laser powder bed fusion (LPBF) technology. The influence of Mn addition on the solidification microstructure was investigated through multiscale characterization methods, and the wear behavior of the modified alloy was evaluated via a ball-on-flat tribometer against 100Cr6 steel under three different loads (2.1 N, 10 N, and 24 N). The results demonstrate that the formation of bimode columnar<img>equiaxed grains is attributed to the addition of Ti with nanosized Al<sub>3</sub>Ti particles, whereas Mn is oversaturated and solid-solved within the matrix, with no significant Mn precipitation observed. This oversaturation increases the distortion of the Al matrix, improving the strain hardening capability and oxidation resistance of the material. As a result, the wear rates after Mn modification were reduced by 78.4 %, 66.7 %, and 56.8 % under 2.1 N, 10 N, and 24 N loads, respectively, compared with those of the LPBF Al<img>Cu<img>Mg<img>Si<img>Ti alloy.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"208 ","pages":"Article 110660"},"PeriodicalIF":6.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Atomic-scale insights into the mechanical and tribological properties of graphullerene

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-18 DOI: 10.1016/j.triboint.2025.110656

Feng Qiu, Hui Song, Zhiquan Yang, Mingliang Jiang, Xianguo Hu

{"title":"Atomic-scale insights into the mechanical and tribological properties of graphullerene","authors":"Feng Qiu, Hui Song, Zhiquan Yang, Mingliang Jiang, Xianguo Hu","doi":"10.1016/j.triboint.2025.110656","DOIUrl":"10.1016/j.triboint.2025.110656","url":null,"abstract":"<div><div>Graphullerene (GF) as an emerging two-dimensional nanomaterial exhibits excellent flexibility properties and superlubricity potential, but current research on its mechanical and tribological properties still lacks in-depth insights from the microscopic scale. Herein, the mechanical strength of GF was explored and its tribological mechanisms as a lubricant additive in fluid and boundary lubrication states were revealed by indentation, tensile, and friction molecular dynamics simulations using graphene (GR) as a comparative object. The results revealed that compared with GR, covalent bond mixed hybridization reduced the mechanical strength of GF, but the robust spherical structure enhanced its bending stiffness. Under fluid lubrication, GR promoted adsorption film formation and rapid flow to induce low-shear strength solid-liquid interfacial slip. GF inhibited this characteristic and thus induced liquid-liquid interlayer slip with high frictional resistance. Under boundary lubrication, GR exhibited superior tribological performance compared to GF, with the bilayer outperforming the monolayer. This was attributed to the high bending stiffness of GF inhibiting the bending deformation releasing stresses and thus deteriorating the mechanical contact with the asperity. However, friction-induced interlayer slip of bilayer nanoparticles with low shear strength. This study provides valuable insights into the mechanical and tribological properties of GF.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"208 ","pages":"Article 110656"},"PeriodicalIF":6.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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The influence of mechanical shearing on the thickener microstructure and properties of Polyurea greases

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-18 DOI: 10.1016/j.triboint.2025.110655

Peng Ding , Wenhui Cao , Qi Ding , Chaobin Liu , Wei Yu , Litian Hu

引用次数: 0

Tribological properties and molecular dynamics analysis of citric acid modified 3D porous graphene/carbon black as lubricant additives

IF 6.1 1区工程技术

Tribology International Pub Date : 2025-03-18 DOI: 10.1016/j.triboint.2025.110648

Jingjing Fei , Lianfei Zhao , Qingpeng Zheng , Wentian Wei , Lizhe Liang , Zhi Qun Tian

{"title":"Tribological properties and molecular dynamics analysis of citric acid modified 3D porous graphene/carbon black as lubricant additives","authors":"Jingjing Fei , Lianfei Zhao , Qingpeng Zheng , Wentian Wei , Lizhe Liang , Zhi Qun Tian","doi":"10.1016/j.triboint.2025.110648","DOIUrl":"10.1016/j.triboint.2025.110648","url":null,"abstract":"<div><div>Graphene holds significant potential as a green additive for lubricating oils, but its poor dispersion stability limits its applications. In this study, citric acid-modified graphene (CAG) was prepared by modifying 3D porous graphene with citric acid, achieving stable dispersion in lubricating oil for up to six months without the need for dispersants. The lubricating properties were investigated using a four-ball friction tester, and wear scars were characterized using the depth-of-field microscope, Scanning electron microscopy (SEM), and Raman spectroscopy. The experimental results demonstrated that adding a composite (CC) of CAG and carbon black to castor oil reduced the coefficient of friction (COF) and anti-wear by 24.57 % and 70.27 %, respectively, under a load of 392 N. Under a load of 588 N, the COF and anti-wear decreased by 32.59 % and 56.54 %, respectively, while the last non-seizure load (P<sub>B</sub>) increased by 125.26 %. The sheet-like CAG adsorbed onto the friction surface, enhancing the oil film's load-carrying capacity, while the spherical carbon black acted as microbearings, converting part of the sliding friction into rolling lubrication. A synergistic effect between CAG and carbon black was observed, with the composite exhibiting better lubricating performance than either material alone. Moreover, molecular dynamics simulation results revealed that adding CAG alone enhanced the lubricant's adsorption but reduced its mobility. The combined addition of CAG and carbon black retained the improved adsorption while enhancing the lubricant's mobility, further confirming the synergistic action between CAG and carbon black.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"208 ","pages":"Article 110648"},"PeriodicalIF":6.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0