Microstructure and high temperature oxidation resistance property of packing Al cementation on Ti-Al-Zr alloy

Tian, Hongwei; Zhou, Ke; Zou, Yongchun; Cai, Hui; Wang, Y.M.; Ouyang, Jia‐Hu; Li, X.W.

doi:10.1016/j.surfcoat.2019.06.090

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…The distribution of Fe locates on the plastic deformation area, while some Ti element is overlapped on these areas. This indicates the iron oxide is compressed in a thin film covered on the titanium substrate with less titanium oxide scale [38,39]. Meanwhile, the surface presents less oxide particle spread on the wear track with a compacted deformation area.…”

Section: Chemical and Component Analysis Of The Contact Interfacementioning

confidence: 99%

“…In the friction process, the Fe 3 O 4 peels off to the wear mark under the action of friction, and then forms a discontinuous protective film [41], which also causes a lower COF at 650 • C. distribution of Fe locates on the plastic deformation area, while some Ti element is overlapped on these areas. This indicates the iron oxide is compressed in a thin film covered on the titanium substrate with less titanium oxide scale [38,39]. Meanwhile, the surface presents less oxide particle spread on the wear track with a compacted deformation area.…”

Section: Chemical and Component Analysis Of The Contact Interfacementioning

confidence: 99%

See 1 more Smart Citation

Chemical- and Mechanical-Induced Lubrication Mechanisms during Hot Rolling of Titanium Alloys Using a Mixed Graphene-Incorporating Lubricant

Kong

Zhang

et al. 2020

Nanomaterials

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Hot rolling of titanium alloy currently is carried out without lubrication because of the surface defects. In order to explore an effective lubrication scheme to reduce friction and wear during hot rolling of titanium alloy, a mixed graphene-incorporating lubricant has been proposed to study its lubrication performance and mechanism. The tribological experiments were carried out by ball-disk friction and wear tester under hot-rolling parameters. Scanning electron microscopy (SEM), X-ray energy spectrum analyzer (EDS), X-ray powder diffractometer (XRD) and Raman analysis were used to analyse the surface and cross-section of the wear marks on the samples after the tribological experiments. The results show that the friction coefficient decreases up to about 35% compared with tests under dry and lubricated conditions. The surface quality of the wear marks is improved significantly after applying the proposed lubricant. The graphene which is embedded in the phosphate film can be effectively applied as a lubricating material to strengthen the lubricating film with less combustion loss at high temperatures. A chemical- and mechanical-induced lubrication mechanism for the hot rolling of titanium sheets has been proposed due to the synergistic lubrication effect of the graphene, ZrO2 nano particles and phosphate. It is of great significance and potential value to apply this proposed lubricant as an effective way to reduce the wear, friction and oxidation during the hot-rolling process of titanium alloy.

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Section: Chemical and Component Analysis Of The Contact Interfacementioning

confidence: 99%

Section: Chemical and Component Analysis Of The Contact Interfacementioning

confidence: 99%

Chemical- and Mechanical-Induced Lubrication Mechanisms during Hot Rolling of Titanium Alloys Using a Mixed Graphene-Incorporating Lubricant

Kong

Zhang

et al. 2020

Nanomaterials

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“…At the same time, compared with conventional argon-arc welding, laser welding has advantages such as fast welding speed, low heat input, small welding deformation and thermal damage, and excellent joint quality [4][5] , so it is widely used in aerospace and other fields. At present, the research on laser welding of niobium tungsten alloy is very little, mainly focusing on the material itself and its oxidation resistance [6][7][8][9] . Li Y L et al [10][11] have studied the effects of dissimilar thickness butt welding and pre-welding assembly margin on laser welding of niobium tungsten alloy respectively, while the welding defects have not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Research on Defects Control of Niobium Tungsten Alloy by Laser Welding

Fei¹,

2023

J. Phys.: Conf. Ser.

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The laser welding experiment of Nb521 niobium-tungsten alloy with 1.0mm thickness was carried out, and the effects of different welding edge preparation states, including fast wire cutting + milling and slow wire cutting + no milling, on the weld formation were analyzed. The results show that the laser weldability of the niobium-tungsten alloy is very good. The welding parameters are in a wide range, and good weld formation can be obtained easily. The effect of the welding edge preparation states on weld formation is very small, and all of the welded joints are broken in the base metal zone far away from the weld beam. Based on laser welding, the forming analysis of argon arc repair welding was carried out. The defects such as cracks and oxidation could be controlled effectively by optimizing the welding process. When the ratio of argon arc repair welding is in the range of 30% to 50%, the welded joints still have good tensile properties. The average tensile strength reaches 98.9% of the base metal and the average elongation after fracture reaches 83.8% of the base metal.

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“…However, there has been an increasing industrial demand to develop this generic technology to allow depositions of diffusion coatings on titanium-based alloys, which would provide long-term stability for the alloys at high temperatures in oxidative and corrosive environments [5,6,7,8,9,10,11]. The formation of a continuous α-Al 2 O 3 scale on the high Al-containing coating (i.e., Al 3 Ti) deposited by pack cementation and its barrier function to slow down the inward diffusion of oxygen into the substrates attribute to the improved oxidation behaviours of the Ti-based alloys [12,13,14,15,16,17]. Achieving these objectives would bring substantial technological and economic advantages to the aerospace and power generation industries, enabling the full exploitation of low weight but high-specific strength properties of Ti-based alloys at high temperatures of operation.…”

Section: Introductionmentioning

confidence: 99%

“…The additions of alloying elements to the substrate materials not only influence their oxidation behaviours, but also affect the microstructure and oxidation resistance of the aluminide coatings deposited on the Ti-based alloys [6,14,17,20,21]. It is reported [20,21] that the addition of Nb or Cr may facilitate the partial conversion of Al 3 Ti from a tetragonal structure to high symmetric cubic L12 structure, thereby leading to better toughness than the original Al 3 Ti due to the dissolution of Nb or Cr into Al 3 Ti.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Aluminide Diffusion Coatings on Ti and Ti-6Al-4V Alloy at the Early Stages of Deposition by Pack Cementation

Tan

et al. 2019

Materials

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The diffusion coatings were deposited on commercially pure Ti and Ti-6Al-4V alloy at up to 1000 °C for up to 10 h using the pack cementation method. The pack powders consisted of 4 wt% Al (Al reservoir) and 4 wt% NH4Cl (activator) which were balanced with Al2O3 (inert filler). The growth kinetics of coatings were gravimetrically measured by a high precision balance. The aluminised specimens were characterised by means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). At the early stages of deposition, a TiO2 (rutile) scale, other than aluminide coating, was developed on both materials at <900 °C. As the experimental temperature arose above 900 °C, the rutile layer became unstable and reduced to the low oxidation state of Ti oxides. When the temperature increased to 1000 °C, the TiO2 scale dissociated almost completely and the aluminide coating began to develop. After a triple-layered coating was generated, the coating growth was governed by the outward migration of Ti species from the substrates and obeyed the parabolic law. The coating formed consisted of an outer layer of Al3Ti, a mid-layer of Al2Ti and an inner layer of AlTi. The outer layer of Al3Ti dominated the thickness of the aluminide coating.

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Microstructure and high temperature oxidation resistance property of packing Al cementation on Ti-Al-Zr alloy

Cited by 10 publications

References 13 publications

Chemical- and Mechanical-Induced Lubrication Mechanisms during Hot Rolling of Titanium Alloys Using a Mixed Graphene-Incorporating Lubricant

Chemical- and Mechanical-Induced Lubrication Mechanisms during Hot Rolling of Titanium Alloys Using a Mixed Graphene-Incorporating Lubricant

Research on Defects Control of Niobium Tungsten Alloy by Laser Welding

Formation Mechanism of Aluminide Diffusion Coatings on Ti and Ti-6Al-4V Alloy at the Early Stages of Deposition by Pack Cementation

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