Effects of niobium particles on the wear behavior of powder metallurgical γ-TiAl alloy in different environments

Qiu, Jingwen; Fu, Zhengfan; Liu, Bin; Liu, Yong; Yan, Jianhui; Pan, Di; Zhang, Weidong; Baker, I.

doi:10.1016/j.wear.2019.202964

Cited by 13 publications

(9 citation statements)

References 33 publications

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“…Enamel is the hardest and toughest mineralized tooth tissue, maintaining its functions throughout a lifetime, despite a few millimeters thick with minimal regenerative capacity [48]. With the increase of age, the thickness of enamel becomes thinner, the organic composition and water content further decrease, the weak parts such as pericardium become calcified, and the structure becomes denser [49,50]. Furthermore, the permeability of enamel is lost, the brittleness is increased [51], while the levels of nitrogen content and neck fluoride are elevated [52,53].…”

Section: Dental Aging-related Anatomical Changesmentioning

confidence: 99%

A New Landscape of Human Dental Aging: Causes, Consequences, and Intervention Avenues

Xie¹,

Chen²,

Shen³

et al. 2022

Aging and disease

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Aging is accompanied by physical dysfunction and physiologic degeneration that occurs over an individual's lifetime. Human teeth, like many other organs, inevitably undergo chronological aging and agerelated changes throughout the lifespan, resulting in a substantial need for preventive, restorative as well as periodontal dental care. This is particularly the case for seniors at 65 years of age and those older but economically disadvantaged. Dental aging not only interferes with normal chewing and digestion, but also affects daily appearance and interpersonal communications. Further dental aging can incur the case of multiple disorders such as oral cancer, encephalitis, and other systemic diseases. In the next decades or even hundreds of years, the proportion of the elderly in the global population will continue to rise, a tendency that attracts increasing attention across multiple scientific and medical disciplines. Dental aging will bring a variety of problems to the elderly themselves and poses serious challenges to the medical profession and social system. A reduced, but functional dentition comprising 20 teeth in occlusion has been proposed as a measurement index of successful dental aging. Healthy dental aging is critical to healthy aging, from both medical and social perspectives. To date, biomedical research on the causes, processes and regulatory mechanisms of dental aging is still in its infancy. In this article, updated insights into typical manifestations, associated pathologies, preventive strategies and molecular changes of dental aging are provided, with future research directions largely projected.

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Section: Dental Aging-related Anatomical Changesmentioning

confidence: 99%

A New Landscape of Human Dental Aging: Causes, Consequences, and Intervention Avenues

Xie¹,

Chen²,

Shen³

et al. 2022

Aging and disease

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“…In β-solidifying γ-TiAl-based alloys, alloying elements aimed at improving the mechanical properties include Nb, Mo, V, Cr and Mn for increasing ductility and stabilizing β-phase in the microstructure [ 45 , 57 , 95 ]. Others include Ta, Mo and W that are meant to improve oxidation resistance [ 45 ]; while B, C and Si are for microstructural refinement [ 45 , 93 ]. Among these alloying elements, effective hardening is caused by C when finely dispersed precipitates of carbides are formed in TiAl-based alloys.…”

Section: Effects Of Alloying Elements On Tial-based Alloysmentioning

confidence: 99%

“…Pratt & Whitney have applied TiAl in producing low-pressure turbine (LPT) blades for their PW1100G turbofan engine; while general electric (GE) developed the LEAP-1A Safran aircraft engines from TiAl alloy [ 81 ]. The Ti–48Al–2Nb–2Cr (4822 alloy) has been adopted by general electric (GE) to manufacture their LPT blades in Boeing 787 and 747-8 of GEnx engines [ 15 , 64 , 93 ]; while Ti-43.5Al–4Nb–1Mo-0.1B (TNM) alloy was used for LPT stage of GTF engine by Pratt and Whitney [ 15 ]. Also, Ti-46.5Al-3.5Nb–2Cr-0.3B alloy is used to make wrought turbine blades [ 94 ].…”

Section: Introductionmentioning

confidence: 99%

Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Raji

Popoola

Pityana

2020

Heliyon

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The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied as turbocharger wheels of automobile and turbine blades of aircraft engines. A much recent alloy type of TiAl called the TNM alloy has emerged and primarily amenable to mechanical working; while providing the best combinations of mechanical properties that could be achieved through manufacturing processes with subsequent heat treatments. This is attained by solidifying entirely through the disordered β-phase (A2 structure). Effects of major alloying elements such as strength improvement, microstructural stability and phase formation demand the understanding of these alloying elements addition in TiAl-based intermetallic alloys. This review paper aims at encapsulating several works regarding the effects of major alloying elements on β-solidifying TiAl-based alloys and summarizing the characteristic effects of Si for these types of alloys. An impetus for future works on these types of intermetallic TiAl-based alloys is also presented.

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“…Usually, serious abrasive wear of TiAl alloy would happen under dry friction condition at room temperature. The poor wear resistance was another major drawback of TiAl alloy [11].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the poor wear resistance was another major drawback of TiAl alloy. 11 Alloying was an effective way of improving the wear and oxidation properties of TiAl alloys. [12][13][14] A number of studies indicated that alloying of Nb, Cr, Hf, Zr, W, to TiAl alloys could increase the ductility and oxidation resistance, especially Nb could greatly improve the high temperature oxidation resistance of g-TiAl.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, nano-mechanical characterization, and fretting wear behavior of plasma surface Cr-Nb alloying on γ-TiAl

Wei

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, surface Cr-Nb alloying was realized on γ-TiAl using double glow plasma hollow cathode discharge technique. An inter-diffusion layer was generated under the surface, composed of Cr2Nb intermetallic compounds. After Cr-Nb alloying, the surface nanohardness of γ-TiAl increased from 5.65 to 11.61 GPa. The surface H/E and H3/E2 increased from 3.37 to 5.98 and from 0.64 to 4.15, respectively. Cr-Nb alloying and its effect on fretting wear were investigated. The surface treatment resulted in improved plastic deformation and fretting wear resistance of γ-TiAl. The fretting wear test showed that an average friction coefficient of γ-TiAl against Si3N4 ball was significantly decreased after Cr-Nb alloying. The fluctuation of friction coefficient during running-in stage was significantly improved. The friction behavior of both γ-TiAl before and after Cr-Nb alloying could be divided into distinctive stages including formation of debris, flaking, formation of crack, and delamination. It was observed that the high hardness, resistance to plastic deformation, and fatigue resistance of γ-TiAl after Cr-Nb alloying could inhibit the formation of debris and delamination during friction test. The fretting wear scar area and the maximum wear scar depth were decreased, indicating that the wear resistance of γ-TiAl has been greatly improved after Cr-Nb alloying. The results indicated that plasma surface Cr-Nb alloying is an effective way for improving the fretting wear resistance of γ-TiAl in aviation area.

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Effects of niobium particles on the wear behavior of powder metallurgical γ-TiAl alloy in different environments

Cited by 13 publications

References 33 publications

A New Landscape of Human Dental Aging: Causes, Consequences, and Intervention Avenues

A New Landscape of Human Dental Aging: Causes, Consequences, and Intervention Avenues

Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Microstructure, nano-mechanical characterization, and fretting wear behavior of plasma surface Cr-Nb alloying on γ-TiAl

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