Study on notch sensitivity of Ti-46Al-5Nb-0.1C alloy: high-temperature tensile and fatigue testing

JI Xiankun; ZHAO Chunling; LI Kui; HE Jian; CHEN Dewan; DING Xianfei; LIANG Yongfeng

doi:10.7513/j.issn.1004-7638.2026.03.010

Volume 47 Issue 3

Jun. 2026

Turn off MathJax

Article Contents

Article Navigation > IRON STEEL VANADIUM TITANIUM > 2026 > 47(3): 92-100

JI Xiankun, ZHAO Chunling, LI Kui, HE Jian, CHEN Dewan, DING Xianfei, LIANG Yongfeng. Study on notch sensitivity of Ti-46Al-5Nb-0.1C alloy: high-temperature tensile and fatigue testing[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 92-100. doi: 10.7513/j.issn.1004-7638.2026.03.010

Citation:

JI Xiankun, ZHAO Chunling, LI Kui, HE Jian, CHEN Dewan, DING Xianfei, LIANG Yongfeng. Study on notch sensitivity of Ti-46Al-5Nb-0.1C alloy: high-temperature tensile and fatigue testing[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 92-100. doi: 10.7513/j.issn.1004-7638.2026.03.010

Citation:

JI Xiankun, ZHAO Chunling, LI Kui, HE Jian, CHEN Dewan, DING Xianfei, LIANG Yongfeng. Study on notch sensitivity of Ti-46Al-5Nb-0.1C alloy: high-temperature tensile and fatigue testing[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 92-100. doi: 10.7513/j.issn.1004-7638.2026.03.010

PDF( 9366 KB)

Study on notch sensitivity of Ti-46Al-5Nb-0.1C alloy: high-temperature tensile and fatigue testing

doi: 10.7513/j.issn.1004-7638.2026.03.010

1.
China Aero-Engine Corporation Hunan Power Machinery Research Institute, Zhuzhou 412002, Hunan, China
2.
Military Representative Office of the Army Equipment Department in Zhuzhou, Zhuzhou 412002, Hunan, China
3.
National Key Laboratory of New Metal Materials, University of Science and Technology Beijing, Beijing 100083, China
4.
Beijing Aerospace Materials Research Institute Co., Ltd., Beijing 100089, China

More Information

Received Date: 2025-08-29
Accepted Date: 2025-12-17
Rev Recd Date: 2025-12-15
Publish Date: 2026-06-29

Abstract

Abstract

Investigating notch mechanics behavior of TiAl alloys is a fundamental approach for ensuring safe and low-risk operation of TiAl alloy low-pressure blades. In this study, notch specimens with different stress concentration factors were prepared and subjected to tensile and fatigue tests at two different temperatures to investigate the notch sensitivity of Ti-46Al-5Nb-0.1C alloy under high-temperature tensile and fatigue conditions. The results from investigation of high-temperature tensile performance notch sensitivity indicate that, under the same temperature conditions, average tensile strength of Ti-46Al-5Nb-0.1C alloy firstly increases and then decreases with the increase of the stress concentration factor Kt. Under the same stress concentration factor Kt, average tensile strength slightly decreases with the increase of temperature, but the change is not significant. The results from investigation of high-temperature fatigue performance notch sensitivity indicate that fatigue strength of Ti-46Al-5Nb-0.1C alloy decreases with increasing stress concentration factor Kt. The fatigue strength of Ti-46Al-5Nb-0.1C alloy at 700 ℃ is higher than that at 550 ℃, indicating that the alloy exhibits good high-temperature fatigue performance. Scanning electron microscopy (SEM) was used to observe the fracture surface morphology and crack propagation and widening of the Ti-46Al-5Nb-0.1C alloy under tensile and fatigue loading. It was found that high stress concentration increased the surface roughness of the fracture surface but did not alter the crack propagation path. Transmission electron microscopy was used to observe the dislocation distribution in the tensile and fatigue deformation microstructures of the Ti-46Al-5Nb-0.1C alloy. The results indicated that dislocations glide were the primary deformation mechanism, with a small amount of deformation twinning observed in the deformation microstructure.
- TiAl alloys,
- tensile notch sensitivity,
- fatigue notch sensitivity,
- fracture,
- cracks

FullText(HTML)

References(27)

References

[1]	KIM Y W. Effects of microstructure on the deformation and fracture of γ-TiAl alloys[J]. Materials Science and Engineering: A, 1995, 192-193: 519-533.
[2]	APPEL F, OEHRING M, WAGNER R. Novel design concepts for gamma-base titanium aluminide alloys[J]. Intermetallics, 2000, 8(9-11): 1283-1312. doi: 10.1016/S0966-9795(00)00036-4
[3]	PERRUT M, CARON P, THOMAS M, et al. High temperature materials for aerospace applications: Ni-based superalloys and γ-TiAl alloys[J]. Comptes Rendus Physique, 2018, 19(8): 657-671. doi: 10.1016/j.crhy.2018.10.002
[4]	BEWLAY B P, NAG S, SUZUKI A, et al. TiAl alloys in commercial aircraft engines[J]. Materials at High Temperatures, 2016, 33(4-5): 549-559. doi: 10.1080/09603409.2016.1183068
[5]	CHEN G, PENG Y B, ZHENG G, et al. Polysynthetic twinned TiAl single crystals for high-temperature applications[J]. nature materials, 2016, 15: 876-881. doi: 10.1038/nmat4677
[6]	BEWLAY B P, WEIMER M, KELLY T, et al. The science, technology, and implementation of TiAl alloys in commercial aircraft engines[J]. MRS Online Proceedings Library, 2013, 1516: 49-58. doi: 10.1557/opl.2013.44
[7]	LIU Y X, ZHOU W B, HUA L, et al. Investigation of the microstructure evolution and mechanical properties of cast Ti–47Al–2Cr–2Nb alloy during ultra-high pressure heat treatment[J]. Materials Science and Engineering: A, 2024, 912: 146967. doi: 10.1016/j.msea.2024.146967
[8]	WANG Q, SONG J X, XIAO C B, et al. A cross-scale study on synergistic deformation mechanisms between the grain boundary orientation and carbide morphology in nickel-based superalloys[J]. Materials Science and Engineering: A, 2025, 935: 148369. doi: 10.1016/j.msea.2025.148369
[9]	DONG C L, YU H C, JIAO Z H, et al. Low cycle fatigue, creep and creep-fatigue interaction behavior of a TiAl alloy at high temperatures[J]. Scripta Materialia, 2018, 144: 60-63. doi: 10.1016/j.scriptamat.2017.09.016
[10]	LINTNER A, PIPPAN R, SCHIOFFER M, et al. Effect of a single overload on the cyclic R-curve behaviour of a γ-TiAl TNM alloy[J]. International Journal of Fatigue, 2022, 163: 107083. doi: 10.1016/j.ijfatigue.2022.107083
[11]	WU Y, LIU J R, WANG H, et al. Effect of stress ratio on very high cycle fatigue properties of Ti-10V-2Fe-3Al alloy with duplex microstructure[J]. Journal of Materials Science & Technology, 2018, 34(7): 1189-1195. doi: 10.1016/j.jmst.2017.11.036
[12]	SAKAGUCHI M, NIWA Y, GONG W X, et al. Temperature dependent fatigue crack growth in forged TiAl alloys with nearly-lamellar and triplex microstructure[J]. Materials Science and Engineering: A, 2021, 806: 140802. doi: 10.1016/j.msea.2021.140802
[13]	HONG S G, YOON S, LEE S B. The effect of temperature on low-cycle fatigue behavior of prior cold worked 316L stainless steel[J]. International Journal of Fatigue, 2003, 25(9-11): 1293-1300.
[14]	YAMAZAKI Y, SUGAYA R, KOBAYASHI U, et al. Effects of thermal cycling and microstructure on the fatigue crack propagation in forged titanium–aluminide alloys under thermomechanical fatigue conditions[J]. Materials Science and Engineering: A, 2020, 797: 140248. doi: 10.1016/j.msea.2020.140248
[15]	ZEILER S, LINTNER A, SCHLOFFER M, et al. Microstructural influences on fatigue threshold behavior and fracture toughness of an additively manufactured γ-titanium aluminide[J]. Intermetallics, 2023, 156: 107852. doi: 10.1016/j.intermet.2023.107852
[16]	XU X S, DING H S, LI W, et al. The microstructure and high cycle fatigue performance of as-cast and directionally solidified Ti46Al7Nb alloy under the three-point bending loading[J]. Materials Science and Engineering: A, 2021, 822: 141633. doi: 10.1016/j.msea.2021.141633
[17]	BODE B, WESSEL W, BRUECKNER-FOIT A, et al. Local deformation at micro‐notches and crack initiation in an intermetallic γ‐TiAl‐alloy[J]. Fatigue & Fracture of Engineering Materials & Structures, 2015, 39(2): 227-237. doi: 10.1111/ffe.12356
[18]	GLOANEC A L, JOUIAD M, BERTHEAU D, et al. Low-cycle fatigue and deformation substructures in an engineering TiAl alloy[J]. Intermetallics, 2007, 15(4): 520-531. doi: 10.1016/j.intermet.2006.09.003
[19]	DING J, ZHANG M H, YE T, et al. Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue[J]. Acta Materialia, 2018, 145: 504-515. doi: 10.1016/j.actamat.2017.12.040
[20]	SUN G Z, HE J L, CAO R, et al. On the role of weak interface in the high cycle fatigue damage mechanism at elevated temperature in forged TNM-TiAl alloy[J]. International Journal of Fatigue, 2026, 202: 109242. doi: 10.1016/j.ijfatigue.2025.109242
[21]	MILKE J G, BEUTH J L, BIERY N E. Notch strengthening in titanium aluminides under monotonic loading[J]. Experimental Mechanics, 2000, 40: 415-424. doi: 10.1007/BF02326488
[22]	KERR D C, STAUBLI M, NAZMY M, et al. Effects of the state of stress on the tensile and creep properties of γ-TiAl[J]. The Journal of Strain Analysis for Engineering Design, 1997, 32(2): 97-105. doi: 10.1243/0309324971513247
[23]	CAO R, WEN J X, LIU H J, et al. Notch sensitivity and failure behavior of TiAl and K418 alloys[J]. Journal of Materials Engineering and Performance, 2018, 27: 3374-3385. doi: 10.1007/s11665-018-3440-5
[24]	YUE X G, ZHOU Z H, MA Y, et al. Notch fracture properties of TiAl intermetallic compounds[J]. Acta Aeronautica et Astronautica Sinica, 2010, 31(9): 1900-1906.
[25]	XU X S, DING H S, LI W, et al. The smooth and notched three-point bending fatigue behavior of directionally solidified high-Nb TiAl alloy[J]. Materials Characterization, 2021, 181: 111444. doi: 10.1016/j.matchar.2021.111444
[26]	STRZELECKI P. Scatter of fatigue life regarding stress concentration factor[J]. Procedia Structural Integrity, 2018, 13: 631-635. doi: 10.1016/j.prostr.2018.12.104
[27]	LIU J H, HUA F L, LANG S S, et al. Evaluation of fatigue strength on multiaxial notched specimenss considering failure probability[J]. International Journal of Fatigue, 2022, 156: 106649. doi: 10.1016/j.ijfatigue.2021.106649