Microstructure and High Temperature Oxidation Properties of Al-Y Co-deposition Coating on TiAl Alloy

doi:10.3901/JME.2025.04.137

Abstract

Abstract: The Al-Y co-deposition coatings on TiAl alloy are prepared by pack cementation processes at 930 ℃ for 2 h, scanning electron microscope, X-ray diffraction and energy dispersive spectrometry are employed to investigate the microstructure phase composition of the coatings. High temperature oxidation properties of both alloy and coating are comparatively investigated. The results show that the coating prepared by this process have a good metallurgical combination with the alloy and a composite structure with a thickness of 53 µm, mainly composed of a TiAl₃, TiAl₂ outer layer, a TiAl₃ middle layer and a TiAl₂ inner layer. High temperature oxidation experiments showes that：the loose Ti-rich oxide outer layer and TiO₂+Al₂O₃ secondary outer layer formed on the surface of TiAl matrix during the oxidation process could not hinder the internal diffusion of O element, resulting in the repeated peeling of oxide film, and eventually leading to catastrophic oxidation. Moreover, dense Al₂O₃ film is formed on the Al-Y coating during oxidation, which hinders the internal diffusion of O element and effectively improves the high-temperature oxidation resistance of the alloy. With the prolonged of oxidation time, the inner/outer diffusion of Al and the outer diffusion of Ti leading to the peeling off of the oxide film, but the remaining layer still maintained good metallurgical bonding with the alloy and still have certain protective properties.

Key words: TiAl alloy, Al-Y co-deposition coating, microstructure, high temperature oxidation

CLC Number:

TG174

LI Yongquan, HAO Qingrui, LIANG Guodong, WANG Cunxi, GAO Yang. Microstructure and High Temperature Oxidation Properties of Al-Y Co-deposition Coating on TiAl Alloy[J]. Journal of Mechanical Engineering, 2025, 61(4): 137-146.

References

[1] ZOU Q，GUAN Y，LI Y G，et al. Advances and perspectives of TiAl alloy and its composites[J]. Journal of Yanshan University，2020，44(2):95-107.
[2] KIM S W，Hong J K，NA Y S，et al. Development of TiAl alloys with excellent mechanical properties and oxidation resistance[J]. Materials and Design，2014，54:97-105.
[3] XIONG H P，MAO J Y，SHEN B Q，et al. Research advances on the welding and joining technologies of light-mass high-temperature structural materials in aerospace field[J]. Journal of Materials Engineering，2013(10):1-12.
[4] WANG J Q，Kong L Y，LI T F，et al. Oxidation behavior of thermal barrier coatings with a TiAl₃ bond coat on γ-TiAl alloy[J]. Journal of Thermal Spray Technology，2015，24(3):467.
[5] ZHOU C X，LIU B，LIU Y，et al. Effect of carbon on high temperature compressive and creep properties of β-stabilized TiAl alloy[J]. Transactions of Nonferrous Metals Society of China，2017，27(11):2400-2405.
[6] CHEN R，ZHENG D，GUO J，et al. A novel method for grain refinement and microstructure modification in TiAl alloy by ultrasonic vibration[J]. Materials Science & Engineering A，2016，653:23-26.
[7] CHEN Z Y，WU L J，ZHOU F，et al. The effect factors and the improvement ways of room temperature ductility for TiAl based alloy[J]. Material Review，2014，28(9):1144-1149.
[8] TRZASKA Z，COURS R，MONCHOUS J P. Densification of Ni and TiAl by SPS:Kinetics and microscopic mechanisms[J]. Metallurgrical and Materials Transaction A，2018，49，4849-4859.
[9] ZHANG C Y，ZHANG L X，HOU H. First-principles study on the elastic properties of Do₁₉-Ti₃Al by the Co，Ni and Ga alloying[J]. Journal of Atomic and Molecular Physics，2019，36(6):1025-1030.
[10] PAN Y，LU X，LIU C C，et al. Effect of Sn addition on densification and mechanical properties of sintered TiAl base alloys[J]. Acta Metallurgica Sinica，2018，54(1):93-99.
[11] TIAN J，ZHANG C H，TIAN W，et al. Effects of Co on microstructure and high temperature oxidation resistance of ascast TiAl-Nb alloy[J]. Rare Metal Materials and Engineering，2020，49(10):3597-3603.
[12] ZHANG Y，WANG X P，KONG F T，et al. Effects of alloying additions on hot deformation processing of TiAl alloys[J]. Rare Metal Materials and Engineering，2017，46(11):3570-3576.
[13] ZHANG Y，WANG X P，KONG F T，et al. Effects of alloying additions on hot deformation processing of TiAl alloys[J]. Rare Metal Materials and Engineering，2017，46(11):3570-3576.
[14] WANG X N，ZHU L P，YU W，et al. Research progress of powder hot isostatic pressing for intermetallic titanium aluminide[J]. Rare Metal Materials and Engineering，2021，50(10):3797-3808.
[15] MOLAEI R，FATEMI A，PHAN N. Significance of hot isostatic pressing (HIP) on multiaxial deformation and fatigue behaviors of additive manufactured Ti-6Al-4V including build orientation and surface roughness effects[J]. International Journal of Fatigue，2018，117:352-370.
[16] 姚斌，周海，陈飞. TiAl合金表面等离子喷涂层的形貌和抗氧化性分析[J]. 金属热处理，2004(10):17-19. YAO Bin，ZHOU Hai，CHEN Fei. Oxidation resistance and micrographs of plasma sprayed coating on the TiAl alloy surface[J]. Heat Treatment of Metals，2004(10):17-19.
[17] 王冰莹，袁霄梅，王文慧. TiAl基合金Nb-C复合渗高温抗氧化性能研究[J]. 表面技术，2011，40(5):45-47. WANG Bingying，YUAN Xiaomei，WANG Wenhui. Study on oxidation resistances of TiAl alloy by the duplex treatment of plasma niobizing and carburization[J]. Surface Technology，2011，40(5):45-47.
[18] 张李波，魏东博，张平则. γ-TiAl表面双辉等离子W-Mo合金化对其氧化行为的影响[J]. 表面技术，2018，47(4):17-23. ZHANG Libo，WEI Dongbo，ZHANG Pingze. Effect of W-Mo alloying of double glow plasma on γ-TiAl surface on oxidation behavior[J]. Surface Technology，2018，47(4):17-23.
[19] JOSEPH N N，ZHU J J，BERTRAND V G，et al. Effect of heat treatment on the microstructure and corrosion behavior of Arc-sprayed FeCrAl/Al coating[J]. Journal of Materials Engineering and Performance，2022，56(5):1059-1064.
[20] TIAN X D，GUO X P，SUN Z P，et al. Effects of Y₂O₃/Y on Si-B co-deposition coating prepared through HAPC method on pure molybdenum[J]. Journal of Rare Earths，2016(34):952-957.
[21] BECKER S，RAHMEL A，SCHOR M，et al. Mechanism of isothermal oxidation of the intermetallic TiAl alloys[J]. Oxidation of Metals，1992，38(5-6):425-464.