Oxidation behaviors of TA15 titanium alloy and TiBw reinforced TA15 matrix composites prepared by spark plasma sintering

doi:10.1016/j.jmst.2019.07.037

Abstract

Abstract:

The purpose of this study is to investigate the oxidation behaviors of the TA15 titanium alloy and TiBw/TA15 composite with network microstructure in the temperature range of 873-1073 K. The results show that the oxidation kinetics of the TA15 titanium alloy and TiBw/TA15 composite follows different laws at various oxidation temperatures. Moreover, the effective activation energy Q for oxidation of the TA15 titanium alloy and TiBw/TA15 composite is determined to be 299 ± 19.9 kJ/mol and 339 ± 8.31 kJ/mol at the temperature of 973-1073 K, respectively. The experimental achievements of oxidation kinetics and oxide scales formed in the test temperatures indicate that the TiBw/TA15 composite exhibits a higher oxidation resistance than TA15 titanium alloy. A schematic diagram of oxidation mechanism is established to further reveal the oxidation process for TiBw/TA15 composite at elevated temperatures.

Key words: Composite materials, Powder metallurgy, Sintering, Kinetics, Oxidation

Dongjun Wang, Hao Li, Wei Zheng. Oxidation behaviors of TA15 titanium alloy and TiBw reinforced TA15 matrix composites prepared by spark plasma sintering[J]. J. Mater. Sci. Technol., 2020, 37: 46-54.

Figures/Tables 9

Fig. 1. Microstructures of TA15 titanium alloy (a) and TiBw/TA15 composite (b).

Fig. 2. Relationship between mass gain and time of the TA15 titanium alloy and TiBw/TA15 composite.

Fig. 3. XRD patterns of the TA15 titanium alloy and TiBw/TA15 composite after oxidation: (a) 873-973?K; (b) 1023-1073?K.

Fig. 4. Typical surface morphologies of the oxide scales after oxidation at different temperatures for 120?h: (a1) 873?K for TA15; (a2) 873?K for TiBw/TA15; (b1) 973?K for TA15; (b2) 973?K for TiBw/TA15; (c1) 1023?K for TA15; (c2) 1023?K for TiBw/TA15; (d1) 1073?K for TA15; (d2) 1073?K for TiBw/TA15.

Fig. 5. Images of cross-section for the samples after oxidation and the EDS line scanning results: (a1, a2) 973?K for TA15; (b1, b2) 973?K for TiBw/TA15; (c1, c2) 1023?K for TA15; (d1, d2) 1023?K for TiBw/TA15.

Fig. 6. Plot of ln(ΔM) vs. ln(t) (a) and the Arrhenius plot of parabolic rate constant (kp) for oxidation of the two materials in the temperature range of 973-1073?K (b).

Table 1 Rate exponents n and calculated parabolic rate constants kp of the TA15 titanium alloy and TiBw/TA15 composite oxidized in the temperature range of 973-1073?K.

Materials	n			k_p (10^-3×mg cm^-2?h^-1)
	973?K	1023?K	1073?K	973?K	1023?K	1073?K
TA15	2.52	1.45	1.75	6.51	54.6	220
TiBw/TA15	2.07	2.01	1.89	3.63	31.3	186

Table 2 EDS analysis results of the TA15 titanium alloy and TiBw/TA15 composite at oxidation temperature 873?K (points shown in Fig. 4(a1) and (a2)).

Points	Ti	Al	O	Zr	Mo	V	B
A (TA15)	73.93	5.59	17.01	2.16	1.32	0.00	—
B (TA15)	75.92	5.93	15.52	1.89	0.73	0.00	—
C (TiBw/TA15)	74.74	5.85	16.33	1.73	1.05	0.00	0.30
D (TiBw/TA15)	71.85	1.87	24.23	0.78	0.89	0.11	0.27

Fig. 7. Typical surface morphologies of the oxide scales for TiBw/TA15 composite after oxidation at 1023?K with 2?h (a), 10?h (b), the three-dimensional photograph of the TiBw/TA15 composite (c), the initial stage of oxidation diagram for a network unit (d), the oxidation diagram of cross-section for a network unit (e), and the formation illustration of layered oxide scale (f).

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