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Acta Metall Sin  2017, Vol. 53 Issue (2): 201-210    DOI: 10.11900/0412.1961.2016.00119
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Effect of Heat Treatment on High-Temperature Oxidation Resistance of High Niobium Ti-Al Intermetallic Coating Fabricated by Laser In Situ Synthesis on Titanium Alloy
Hongxi LIU(),Zhengxue LI,Xiaowei ZHANG,Jun TAN,Yehua JIANG
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
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Abstract  

Titanium alloys are widely used as structural material in aerospace, automobile, biomedical and other fields because of its low density, high specific strength, good corrosion resistance and good biocompatibility. But high coefficient of friction, poor wear resistance and high-temperature oxidation resistance are the main reasons for limiting the use of titanium alloy in complex working conditions. In order to improve the high-temperature oxidation resistance and optimize the microstructure of titanium alloy, high Nb content Ti-Al intermetallic composite coating was fabricated by laser in situ synthesis technique on BT3-1 titanium alloy surface. Phase structure of the composite coating was analyzed according to XRD spectra. Unit area oxidation weight gain of the titanium alloy substrate and coating before and after heat treatment were tested by GSL-1600X tube furnace under 950 ℃. The oxidation kinetics curves were drawn and the high temperature oxidation resistance was compared. The microstructures of coating before and after oxidation were observed by OM and SEM, and the high-temperature oxidation resistance mechanism was analyzed. The results show that the coating mainly consists of Nb, intermetallic γ-TiAl, α2-Ti3Al and Ti3Al2 phases before heat treatment. But after heat treatment, Nb is dissolved in γ-TiAl and α2-Ti3Al, and a new phase Ti3AlNb0.3 is generated in the coating. The coating is approximately γ-TiAl+α2-Ti3Al duplex structure. The oxidation kinetics curves of coating is between linear and parabolic rule before heat treatment, its high temperature oxidation resistance increased by 2 times of titanium alloy substrate. The oxidation kinetics curves of coating is approximately parabolic law after heat treatment, and the rate of oxidation is small, its high temperature oxidation resistance increased more than 20 times of titanium alloy substrate. Under 950 ℃ cyclic oxidation conditions, the oxide layer surface of coating forms a continuous dense capsule oxide, and oxide layer closely connect the unoxidized coating portion, the oxide layer plays a good protective role of the composite coating. But for titanium alloy substrate, the oxide layer surface is loose and porous oxide, the oxide layer is fractured and removed from the substrate surface. Nb alloying significantly improves the high temperature oxidation resistance of Ti-Al intermetallic coating.

Key words:  titanium alloy      laser in situ synthesis      Ti-Al intermetallic      heat treatment      high-temperature oxidation resistance     
Received:  06 April 2016     
Fund: Supported by National Natural Science Foundation of China (Nos.61368003 and 11674134), Key Project of Applied Basic Research Program of Yunnan Province (No.2016FA020) and Reserve Talent of Youthful and Middle-aged Academic Leaders in Yunnan Province (No.2014HB007)

Cite this article: 

Hongxi LIU,Zhengxue LI,Xiaowei ZHANG,Jun TAN,Yehua JIANG. Effect of Heat Treatment on High-Temperature Oxidation Resistance of High Niobium Ti-Al Intermetallic Coating Fabricated by Laser In Situ Synthesis on Titanium Alloy. Acta Metall Sin, 2017, 53(2): 201-210.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00119     OR     https://www.ams.org.cn/EN/Y2017/V53/I2/201

Fig.1  Heat treatment process curve of titanium alloy substrate and composite coating
Fig.2  XRD spectra of laser in situ synthesis Ti-Al-Nb composite coating on samples A1 and A11 surface
Sample Reaction rate constant k Index n
A0 0.67804 0.93053
A01 0.64571 0.95832
A1 0.62029 0.81949
A11 0.24686 0.47257
Table1  Parameters of oxidation kinetic curves of titanium alloy and composite coating samples under 950 ℃ cyclic oxidation
Fig.3  Oxidation kinetics curves of titanium alloy and composite coating samples under 950 ℃
Fig.4  Cross-sectional OM images of titanium alloy substrate under 950 ℃ oxidation before (a) and after (b) heat treatment
Fig.5  Cross-sectional SEM images of sample A1 for surface and interface oxidation layer under 950 ℃ cyclic oxidation condition (a, b) surface oxidation layer (c, d) interface oxidation layer
Fig.6  Cross-sectional SEM images of sample A11 under 950 ℃ cyclic oxidation condition (a) surface oxidation layer (b) interface oxidation layer
Fig.7  Surface oxidation layer XRD spectra of titanium alloy substrate (a) and composite coating (b) before and after heat treatment under 950 ℃ cyclic oxidation condition
Fig.8  Oxidation layer surface SEM images of titanium alloy substrate before (a) and after (b) heat treatment
Fig.9  Oxidation layer surface SEM images of composite coating before (a) and after (b) heat treatment
Position O Al Ti Mo Cr Si C Nb
Point 1 in Fig.8a 61.21 3.18 31.14 2.08 1.95 0.43 - -
Point 2 in Fig.8a 56.17 13.11 27.74 1.38 1.13 0.47 - -
Point 3 in Fig.9a 18.68 - 0.19 - - - 81.13 -
Point 4 in Fig.9a 58.04 22.27 18.42 - - - - 1.27
Point 5 in Fig.9a 63.49 1.71 2.13 - - - - 32.67
Point 6 in Fig.9a 38.78 - 0.06 - - - 61.16 -
Point 7 in Fig.9a 54.83 1.38 2.23 - - - - 41.56
Point 8 in Fig.9a 66.85 28.83 3.48 - - - - 0.84
Point 9 in Fig.9a 17.62 0.53 0.16 - - - 81.69 -
Point 10 in Fig.9b 65.68 19.89 12.41 - - - - 2.02
Table 2  EDS analysis results in different positions of surface oxidation layer on BT3-1 titanium alloy substrate and composite coating before and after heat treatment (mass fraction / %)
Fig.10  Gibbs free energies of Ti, Al, Nb oxide change with temperature
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