Microstructure, mechanical and tribological properties of TiAl-based composites reinforced with high volume fraction of nearly network Ti2AlC particulates

doi:10.1016/j.jmst.2017.09.007

Abstract

Abstract:

TiAl-based composites reinforced with different high volume fractions of nearly network Ti₂AlC phase have been successfully prepared by mechanical alloying and hot-pressing method. Their microstructure, mechanical and tribological properties have been investigated. Ti₂AlC network becomes continuous but the network wall grows thicker with increasing the Ti₂AlC content. The continuity and wall size of the network Ti₂AlC phase exert a significant influence on the mechanical properties. The bending strength of the composites first increases and then decreases with the Ti₂AlC content. The compressive strength of the composite decreases slightly compared to the TiAl alloy, but the hardness is enhanced. Due to the high hardness and load-carrying capacity of the network structure, these composites have the better wear resistance. And this enhancement is more notable at low applied loads and high Ti₂AlC content. The mechanisms simulating the role of network Ti₂AlC phase on the wear behavior and the wear process of TiAl/Ti₂AlC composites at different applied loads have been proposed.

Key words: TiAl/Ti₂AlC composites, Network structure, Wear resistance

Jun Cheng, Shengyu Zhu, Yuan Yu, Jun Yang, Weimin Liu. Microstructure, mechanical and tribological properties of TiAl-based composites reinforced with high volume fraction of nearly network Ti₂AlC particulates[J]. J. Mater. Sci. Technol., 2018, 34(4): 670-678.

Figures/Tables 13

Fig. 1. XRD patterns of TiAl/Ti2AlC composites.

Fig. 2. SEM secondary electron images of TiAl/Ti2AlC composites: (a) TAC10; (b) TAC20; (c) TAC40.

Table 1 Characteristics of Ti-46Al-2Cr-2Nb alloy and TiAl/Ti2AlC composites.

Material	Hardness (GPa)	Bending strength (MPa)	Compressive strength (MPa)	Density (g cm^-3)
TAC0	4.45	675	1870	3.975
TAC10	5.35	680	1660	4.070
TAC20	6.28	825	1787	4.060
TAC40	6.46	480	1484	4.098

Fig. 3. SEM images and composition of mixed TiAl and TiC powders of TAC10.

Fig. 4. Schematic simulating formation mechanism of network structure Ti2AlC in TiAl matrix.

Fig. 5. (a) Friction coefficient versus sliding time at applied load of 40 N and (b) friction coefficient at different applied loads with sliding speed of 0.03 m s-1 of composites.

Fig. 6. Wear rates of composites at different applied loads with sliding speed of 0.03 m s-1.

Fig. 7. SEM images of worn surface morphologies of TiAl/Ti2AlC composites at different applied loads with sliding speed of 0.03 m s-1: (a) TAC20, 20 N; (b) TAC20, 50 N; (c) TAC40, 20 N; (d) TAC40, 50 N; (e) TAC0, 20 N; (f) TAC0, 50 N.

Fig. 8. XPS spectra of Fe2p (a), Ti2p (b) and Al2p (c) on worn surfaces of TAC20 at different loads with sliding speed of 0.03 m s-1.

Fig. 9. Schematics simulating role of net-work Ti2AlC phase on wear behavior and wear process of TiAl/Ti2AlC composites at different applied loads.

Fig. 10. EDS analysis of entire worn surfaces of (a) TAC0 and (b) TAC20 at load of 20 N with sliding speed of 0.03 m s-1 shown in Fig. 7.

Fig. 11. Subsurface microstructure underneath wear scars for TAC40 at 40 N (a) and 60 N (b).

Fig. 12. High resolution SEM images of worn surfaces of TAC0 at 30 N (a) and 40 N (b).

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Microstructure, mechanical and tribological properties of TiAl-based composites reinforced with high volume fraction of nearly network Ti₂AlC particulates

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