TNM-TiAl合金室温高周疲劳性能研究

doi:10.11896/cldb.21090297

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Abstract Tensile and compressive fatigue tests at stress ratio R=-1 and tensile fatigue tests at R=0.1 were carried out on TNM-TiAl alloy samples using up-and-down method and group method.The P-S-N curve of TNM-TiAl alloy was obtained and the fracture surface was analyzed.The results show that TNM-TiAl alloy is very sensitive to stress.P-S-N curve present a relatively flat oblique line at R=-1 and R=0.1.The fatigue limit at R=-1 and R=0.1 was 414.7 MPa and 285.6 MPa, respectively.The S-N curve at R=0.1 is much lower than that at R=-1.The relationship between the stress amplitude and fatigue life at R=-1 satisfies Basquin equation.The macroscopic fracture surface of fatigue specimen with rough feature is quite different from that of static-tensile specimen with flat feature.The tensile fracture surface is composed of initiation zone and propagation zone.The initiation zone is located at the corner and edge of the specimen surface or plate specimen, and composed of cleavage fracture surface at γ phase, interlamellar fracture surface at lamellar colonies and flat transgranular cleavage fracture surface at β₀ phase. The fatigue fracture surface is composed of crack initiation zone, crack propagation zone, and final fast fracture zone.The fatigue fracture initiation zone includes two types of interlamellar interface cracking and γ phase cracking.The brittle fracture feature dominates the fatigue fracture, which is mainly reflected in a large number of transgranular fracture and kink tear of lamellar clusters,cleavage fracture of γ phase and transgranular fracture of β₀ phase in the propagation zone.The fracture type at R=-1 is similar to that at R=0.1 under the same life scale, but the initiation zone and propagation zone at R=-1 are smoother.No microcracks were found in the unloaded specimens with a fatigue life of 90%, which indicates that the fatigue life is mainly determined by crack initiation.The life of crack propagation is less than 10% of the total life.

Key words： high cycle fatigue TNM-TiAl alloy P-S-N curve fatigue fracture mechanism stress ratio

Published: 25 June 2023 Online: 2023-06-20

CLC number:

TG111.8

Fund:National Natural Science Foundation of China (52175325, 51961024,52071170) and Gansu Provincial Department of Education ‘Double First-class’ Key Scientific Research Project(GSSYLXM-03).

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	SUN Guanze
	CAO Rui
	ZHOU Xin
	WANG Hongwei

Cite this article:

SUN Guanze,CAO Rui,ZHOU Xin, et al. Study on High Cycle Fatigue Properties of TNM-TiAl Alloy at Room Temperature[J]. Materials Reports, 2023, 37(12): 21090297-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21090297 OR http://www.mater-rep.com/EN/Y2023/V37/I12/21090297

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