Plasma immersion ion implantation: Influence on the rotating bending fatigue strength of AA 7050-T7451 aluminum alloy

Minto, Thiago Alexandre; Oliveira, Verônica Mara Cortez Alves de; Voorwald, Herman Jacobus Cornelis

doi:10.1016/j.ijfatigue.2017.05.002

Cited by 16 publications

(20 citation statements)

References 19 publications

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“…High frequencies result in higher operating temperatures and the heat increases the instability of the nitride layer, formed on surface, due to thermal stress [33]. Minto et al [18] studied the fatigue behavior of AA7050 aluminum alloy, treated by PIII with nitrogen, varying the voltage parameters (5-10 kV) and frequency (100-1000 Hz). They performed XRD, microhardness, microscopy, EDS and residual stress analysis of the different experimental conditions and related to the rotating bending fatigue behavior.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, PIII treatments conducted at higher frequencies decreased fatigue resistance of aluminum alloy, although generating compressive residual stresses on surface. Finally, the authors observed that even if the voltage dropped, if the frequency increases, the fatigue resistance of aluminum alloy decreases, making the frequency parameter a predominant influence on microstructure and mechanical behavior [18]. Bonora et al [17] treated 15-5PH stainless steel with nitrogen by PIII.…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, Bonora [17] and Minto [18] reported that stainless steel and aluminum alloys treated by PIII were subjected to cyclic loading and resulted in increased fatigue resistance of the treated materials.…”

Section: Introductionmentioning

confidence: 99%

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Plasma immersion ion implantation (PIII) influence on Ti-6Al-4V alloy: Frequency effect

Oliveira

Cioffi

Barboza³

et al. 2018

International Journal of Fatigue

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The plasma immersion ion implantation treatment (PIII) acts to increase mechanical resistance with solid solution formation, new phases and defects inclusion, besides chemical and residual stress profile modification. Ti-6Al-4V alloy presents poor tribological properties and high affinity with interstitial elements, such as nitrogen and oxygen, this makes it more reactive at high temperatures. This paper aims to study Ti-6Al-4V alloy fatigue behavior subjected to nitrogen addition by plasma immersion ion implantation. It was investigated the frequency parameter influence on fatigue resistance. Ti-6Al-4V alloy was PIII treated with voltage equal to 9.5 kV, frequencies varying between 1000 and 1500 Hz and submitted to axial fatigue tests. Axial fatigue tests were performed, at room temperature and R = 0.1. Ti-6Al-4V alloy fatigue results were supported by Weibull statistics analysis. Ti-6Al-4V alloy microstructural analysis showed equiaxed α + β grains. Weibull analysis at untreated condition presented m values greater than 1, indicating reliability and uniformity. For a lifetime of 10 7 cycles, fatigue resistance was equal to 829 MPa for untreated condition, 644, 767 and 417 MPa, for f = 1000, 1200 and 1500 Hz, respectively. The nitrogen-based compounds were detected only at the condition where f = 1200 Hz. Thus, the combination of PIII treatment parameters, when f = 1200 Hz, hindered crack nucleation and increasing fatigue resistance of treated Ti-6Al-4V alloy when compared with the other two treatment conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Plasma immersion ion implantation (PIII) influence on Ti-6Al-4V alloy: Frequency effect

Oliveira

Cioffi

Barboza³

et al. 2018

International Journal of Fatigue

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“…Recent papers showed that PIII treatment increases the fatigue life of steels and aluminum alloys, both applied as landing gear components [28,29]. And when this treatment had a deleterious effect on the fatigue behavior compared to the base material, this drop in performance was lower than that caused by other more conventional surface treatments [25,29,30,31].…”

Section: Resultsmentioning

confidence: 99%

Fatigue behavior of Ti-6Al-4V alloy modified by plasma immersion ion implantation: temperature effect.

Velloso¹,

Nozaki²,

Tapia

et al. 2018

MATEC Web Conf.

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This research studied Ti-6Al-4V alloy behavior with two (2) different microstructure subjected to nitrogen addition by PIII treatment, with and without sample heating, under cyclic load. PIII conditions, at 390 °C, were DC voltage of 9.5 kV, frequency of 1.5 kHz and pulse of 40 μs. PIII conditions, with sample heating at 800 °C, were 7 kV, 0.4 kHz and 30 μs. Axial fatigue tests were performed on untreated and treated samples for resistance to fatigue comparison. The untreated Ti-6Al-4V had an annealed microstructure, PIII treatment at 390 °C resulted in a microstructure that has no nitride layer or diffusion zone. In the PIII treatment at 800 °C, the microstructure presented nitride layer and diffusion zone. Resistance to fatigue decreased with PIII treatments in both temperatures. At 390 °C, the treatment created deformation regions and cracks on surface due to nitrogen implantation that formed solid solution with titanium and imposed lattice strains on the crystal lattice. At 800 °C, bulk ductility decrease, increasing of αTi proportion in microstructure due to α case formation and the presence of a ceramic layer dropped fatigue resistance of Ti-6A-4V alloy.

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“…In addition, the AlN layer can be formed by low-cost nitriding methods such as the in situ forming technique. This idea has inspired several teams worldwide to prepare AlN layers on aluminum and its alloys through nitrogen plasma-assisted nitriding treatments, such as the plasma immersion ion implantation (PIII) method [5,6], electron cyclotron resonance (ECR) plasma method [7][8][9], plasma enhanced chemical vapor deposition method [10], plasma activated physical vapor deposition (PAPVD) method [11], and thermionic arc discharge method [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Formation Mechanism of Nitrided Layers on Aluminum Substrates by Thermal Plasma Nitriding

Xin

Zheng

et al. 2019

Metals

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Nitrided layers on 6082 aluminum alloy substrates and 1060 aluminum substrates are formed at atmospheric pressure using thermal nitrogen plasma, which only takes seconds to form a millimeter-level layer. The nitrided layers are composed of aluminum nitride (AlN) and aluminum solid solution phases. Microstructures in these nitrided layers can be divided into three regions from bottom to top: the transition region, the dendrite region, and the lamella region. These regions are formed in sequence. The formation mechanisms and processes of the three regions are discussed in detail. Furthermore, we found that Al melt is transported upward through the voids and the capillaries in the AlN structures, and reacts with N plasma in the melt surface. The growth of the AlN structures promotes this transport. With the increase of N2 flow rates from 1 L/min to 7.5 L/min, both the hardness and the wear resistance of the nitrided layers are improved, and the nitrided layer becomes thicker.

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Plasma immersion ion implantation: Influence on the rotating bending fatigue strength of AA 7050-T7451 aluminum alloy

Cited by 16 publications

References 19 publications

Plasma immersion ion implantation (PIII) influence on Ti-6Al-4V alloy: Frequency effect

Plasma immersion ion implantation (PIII) influence on Ti-6Al-4V alloy: Frequency effect

Fatigue behavior of Ti-6Al-4V alloy modified by plasma immersion ion implantation: temperature effect.

Microstructural Characterization and Formation Mechanism of Nitrided Layers on Aluminum Substrates by Thermal Plasma Nitriding

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