The effect of Cu content and Ti2Cu precipitation on the combustion behaviour and mechanism of Ti-xCu alloys

Shao, Lei; Xie, Guoliang; Liu, Xinhua; Wu, Yuan; Yu, Jiabin; Feng, Kun; Xue, Wenli

doi:10.1016/j.corsci.2021.109641

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…The most corrosion-resistant sample contains a lot of CuTi2 phase and does not contain phase Cu4Ti3. This confirms the importance of this phase for corrosion resistance [16]. Pure copper present in the metal shows less corrosivity due to the presence of titanium in general.…”

Section: Corrosion Resistance Of Materialssupporting

confidence: 73%

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Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Shichalin

Sakhnevich

Buravlev

et al. 2022

Metals

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To study the material based on the binary system Ti + Cu (50% atm), samples were produced from powders of commercially pure metals and additionally ground in a ball mill (final size about 12 µm) by spark plasma sintering. The following intermetallic phases were obtained in the materials: CuTi2, TiCu, and Ti3Cu4. The materials have a hardness of 363 and 385 HV (800 and 900 °C), a microhardness of 393 and 397 µHV, a density of 4.24 and 5.23 kg/m3, and resistance to corrosion in acids (weight gain + 0.002% after 24 h of testing according to ISO 16151 for a sample with 900 °C—the best result in comparison with steel 308, AA2024, CuA110Fe3Mn2). The hardness value varies due to the presence of pure metal agglomerates. The relationship between the temperature of spark plasma sintering and the characteristics of the material (material parameters improve with increasing temperature, segregation is reduced) is revealed.

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Section: Corrosion Resistance Of Materialssupporting

confidence: 73%

“…Forming a Ti2Cu compound with titanium, copper lowers the combustion rate at high temperatures [16], the substance acts as a thermal barrier. Materials with fcc and hcp (copper and titanium) lattices tend to harden under the influence of low temperatures, experience local martensitic transformation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Shichalin

Sakhnevich

Buravlev

et al. 2022

Metals

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“…式中, ρ g 为气体密度, 在起燃温度附近, 其大小约为1.29 kg/m 3 ; v g 为气体流速, 其数值为33 m/s; η g 为气体黏度, 数值为1.8×10 -5 Pa•s, 计算得出Re≈ 5.9×10 5 , 为湍流条件. 因此对于薄板模型的湍流条件, Nu可进一步表示为 [15] N u = 0.023Re 计的热传导项远低于这一结果 [15][16][17][18] , 故在研究起燃问题时可以忽略 , 当达到着火温度T ig 时,…”

Section: 由于起燃时反应机理为氧吸附机制故单位时unclassified

“…然而, 关于TiO气相对TiO 2 保护性氧化层失效的贡献程度, 目前尚未见研究进行报道. 在钛合金的起燃模型研究方面, 能量方程的基本形式已被广泛研究, 其难点在于起燃阶段反应放热速率的计算 [15][16][17] . NASA等开展的研究工作中, 将近α型高温钛合金燃烧温度(>1800 K)代入实验测定的氧化阶段(1300 K)左右的反应热函数, 但计算得出的燃烧程度与激光着火实验的结果存在较大偏差 [18] .…”

unclassified

Ignition mechanism of near α high temperature titanium alloy

Wu,

Mi,

2024

Acta Phys. Sin.

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The risk of titanium fire increases significantly with the development of future aero-engine, however, the burning mechanisms of titanium alloys remain uncertain. Therefore, the ignition behaviors and mechanisms of near α high-temperature titanium alloy are studied in this paper by employing an integrated experiment method, including laser-oxygen concentration ignition method, infrared temperature measurement and observation of molten metal by high-speed camera. Based on this, the ignition boudary curve is determined and the ignition temperatures of the alloy are found to decrease from 1610 to 1550 ℃ with the increasing of laser power from 200 to 325 W and of oxygen concentration from 21% to 60%. The ignition microstructure was characterized by FIB and TEM to study the evolution of reaction products. Pores are found to form under the TiO2 surface layer, which can be attributed to the instablity of TiO. The failure mechanism of protective oxide layer is further analyzed according the oxide layer damage model caused by thermal stress. As temperature approaches the ignition temperature, which locates below the melting point, the high vapor pressure of TiO causes the formation of porous defects under the TiO2 surface, thus accelerating the fracture and failure of the TiO2 layer under thermal stress. It is revealed that critical conditions of temperature and instantaneous temperature change rate are both required to fulfill the ignition. Based on this, an ignition model is futher constructed to discuss the relationship among ignition temperature, laser power and oxgyen concentration. According to the experimental data fitting, the reaction activation energy of TA19 alloy during the ignition stage is calculated as approximately 300 kJ/mol, and the function for ignition temperature calculation is concluded as 8.3×109e-300000/RTigc1/2＋0.52PL-331=0. This provides a theoretical reference for predicting the ignition temperatures of near α high temperature titanium alloy and other types of titanium alloys under complex airflow conditions in aircraft engines.

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“…On the other hand, the peritectic reaction occurs at the interface between the α phase and the β phase at high temperature, and the liquid phase migrates from the phase interface to the inner grains of the β phase [6]. Hence, monophasic α-Ti or β-Ti tissue is more beneficial to high temperature and burn-resistant performance [1,7,8]. α-Ti has high atomic stacking density, slow atomic diffusion, and better thermal stability and creep resistance than β-Ti.…”

Section: Burn Resistant Ti Alloysmentioning

confidence: 99%

Perspectives on Developing Burn Resistant Titanium Based Coatings—An Opportunity for Cold Spraying

Liang,

Tang,

Wang

et al. 2023

Materials

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Titanium alloys are crucial lightweight materials; however, they are susceptible to spontaneous combustion under high-temperature and high-pressure conditions, limiting their widespread use in aerospace engines. Improving the burn resistance of Ti alloys is essential for the structural safety and lightweight of aerospace equipment. Burn-resistant Ti alloys, such as Ti-V-Cr and Ti-Cu, however, face limitations such as high cost and low specific strength. Surface coatings provide a cost-effective solution while maintaining the high specific strength and good processability of the base material. Conventional surface treatments, such as laser cladding, result in defects and deformation of thin-walled parts. Cold spray technology offers a promising solution, as it uses kinetic energy to deposit coatings at low temperatures, avoiding defects and deformation. In this paper, we review the current research on burn-resistant surface technologies of Ti alloys and propose a new method of bimetallic coating by cold spraying and low-temperature heat treatment, which has the potential to solve the problem of spontaneous combustion of aerospace engine parts. The strategy presented can also guide the development of high-performance intermetallic compound-strengthened metal matrix composite coatings.

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The effect of Cu content and Ti2Cu precipitation on the combustion behaviour and mechanism of Ti-xCu alloys

Cited by 16 publications

References 24 publications

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Ignition mechanism of near α high temperature titanium alloy

Perspectives on Developing Burn Resistant Titanium Based Coatings—An Opportunity for Cold Spraying

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