Microstructure and low cycle fatigue of a Ti2AlNb-based lightweight alloy

doi:10.1016/j.jmst.2020.01.032

Abstract

Abstract:

Ti₂AlNb-based intermetallic compounds are considered as a new category of promising lightweight aerospace materials due to their balanced mechanical properties. The aim of this study was to evaluate monotonic and cyclic deformation behavior of an as-cast Ti-22A1-20Nb-2V-1Mo-0.25Si (at.%) intermetallic compound in relation to its microstructure. The alloy containing an abundant fine lamellar O-Ti₂AlNb phase exhibited a good combination of strength and plasticity, and superb fatigue resistance in comparison with other intermetallic compounds. Cyclic stabilization largely remained except slight cyclic hardening occurring at higher strain amplitudes. While fatigue life could be described using the common Coffin-Mason-Basquin equation, it could be better predicted via a weighted energy-based approach. Fatigue crack growth was characterized mainly by crystallographic cracking, along with fatigue striation-like features being unique to appear in the intermetallics. The results obtained in this study lay the foundation for the safe and durable applications of Ti₂AlNb-based lightweight intermetallic compounds.

Key words: Ti₂AlNb-based alloy, Cyclic deformation, Low cycle fatigue, Fatigue life prediction, Fracture

Yinling Zhang, Aihan Feng, Shoujiang Qu, Jun Shen, Daolun Chen. Microstructure and low cycle fatigue of a Ti₂AlNb-based lightweight alloy[J]. J. Mater. Sci. Technol., 2020, 44: 140-147.

Figures/Tables 13

Fig. 1. XRD spectrum showing the phases present in the as-cast Ti2AlNb-based alloy.

Fig. 2. (a) SEM micrograph of as-cast Ti2AlNb-based alloy; EBSD maps of (b) phase distribution and (c) orientation of O-Ti2AlNb phase; (d) grain boundary distribution of O-Ti2AlNb phase (LAGBs and HAGBs).

Table 1 Tensile properties of as-cast Ti2AlNb-based alloy obtained at different strain rates at room temperature.

Strain rate, s^-1	σ_y, MPa	σ_UTS, MPa	Elongation, %	H_c
1 × 10^-2	837	966	1.5	0.15
1 × 10^-3	828	960	1.7	0.16
1 × 10^-4	876	971	1.5	0.11
1 × 10^-5	765	925	1.8	0.21

Fig. 3. Typical stress-strain hysteresis loops at various total strain amplitudes of as-cast Ti2AlNb-based alloy in the (a) first cycle, and (b) mid-life cycle.

Fig. 4. Stress amplitude versus the number of cycles of the as-cast Ti2AlNb-based alloy tested at different total strain amplitudes at a strain ratio of Rε = -1.

Fig. 5. Plastic strain amplitude versus the number of cycles of the as-cast Ti2AlNb-based alloy tested at different total strain amplitudes at a strain ratio of Rε = -1.

Fig. 6. Total strain amplitude versus the number of cycles to failure for the as-cast Ti2AlNb-based alloy, in comparison with the data available for intermetallics reported in the literature [[62], [63], [64]].

Fig. 7. Total, plastic, and elastic strain amplitude-fatigue life response of the as-cast Ti2AlNb-based alloy.

Table 2 Low cycle fatigue parameters of the as-cast Ti2AlNb-based alloy.

Low cycle fatigue parameters	Symbol	Value
Cycle strain hardening exponent	n’	0.09
Cyclic strength coefficient, MPa	K’	1366
Fatigue strength coefficient, MPa	σ'_f	1369
Fatigue strength exponent	b	-0.077
	b[Morrow]	-0.060
	b [Tomkins]	-0.072
Fatigue ductility coefficient, %	ε'_f	0.44
Fatigue ductility exponent	c	-0.82
	c[Morrow]	-0.70
	c [Tomkins]	-0.86

Fig. 8. Cyclic stress-strain curve (CSSC) for the as-cast Ti2AlNb-based alloy, where the corresponding monotonic stress-strain curve is also potted for comparison.

Fig. 9. Predicted fatigue life from Equ.(5) based on Basquin’s equation and Coffin-Mason relationship, in comparison with the experimental data.

Fig. 10. (a) Total strain energy density of the as-cast Ti2AlNb-based alloy versus total strain amplitude, and (b) the predicted fatigue life based on a combined (or weighted) total strain energy density approach.

Fig. 11. SEM micrographs of the as-cast Ti2AlNb-based alloy tested at a strain amplitude of (a, b) 0.4% and (c, d) 1.0%, respectively, where (a) and (c) show an overall view of fracture surfaces of the specimens fatigued at 0.4% and 1.0%, respectively, while (b) and (d) show a magnified view of the surface surfaces near the crack initiation site.

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Microstructure and low cycle fatigue of a Ti₂AlNb-based lightweight alloy

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