Abstract
Mo-Si-Ti coating was prepared on the surface of γ-TiAl by means of the double-glow plasma surface alloying technique at different soaking times. The coating had good surface quality and was primarily composed of (Ti, Mo)5Si3, TiSi2, TiSi, Ti5Si3, Ti5Si4, and MoSi2. It was observed that the thickness of the deposition layer increased with increasing holding time. However, the thickness of the diffusion layer did not increase further when the holding time exceeded 2 h. The hardness and elastic modulus of the Mo-Si-Ti coating first increased and then decreased with the increase in soaking time. Low crystallite size and a hard phase in the Mo-Si-Ti coating prepared at a soaking time of 2 h were responsible for its high hardness of 26.3 GPa. The results of the nanoindentation test with loading rates of 100-5000 μN/s and a holding time of 10 s showed that the loading rate did not affect the elastic modulus of γ-TiAl and Mo-Si-Ti coating. On top of that, γ-TiAl exhibited strain-hardening behavior with an increase in loading rate, and the Mo-Si-Ti coating exhibited strain-hardening behavior at low loading rates and strain-softening behavior at high loading rates. The results of the nanoindentation test with loading rates of 100-5000 μN/s and holding times of 2-10 s showed that the hardness of γ-TiAl and the Mo-Si-Ti coating varied with those parameters because of the difference in the plastic energy accumulation and release time. When the loading time was short, γ-TiAl exhibited strain-hardening behavior at low loading rates and strain-softening behavior at high loading rates. However, the Mo-Si-Ti coating exhibited strain-hardening behavior at all loading rates. The strain-hardening behavior of γ-TiAl was observed at all loading rates when the retention time was long. However, the Mo-Si-Ti coating exhibited strain-hardening behavior at low loading rates and strain-softening behavior at high loading rates.
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Acknowledgment
This project was supported by Natural Science Foundation for Excellent Young Scientists of Jiangsu Province, China (Grant No. BK20180068), China Postdoctoral Science Foundation funded project (Grant No. 2018M630555), Opening Project of Materials Preparation and Protection for Harsh Environment Key Laboratory of Ministry of Industry and Information Technology (Grant No. XCA20013-1), the Natural Science Foundation of Ningbo Province, China (Grant No.202003N4341),China Postdoctoral Science Foundation, (Grant No.2020M681460), Major special project of "scientific and technological innovation 2025" in Ningbo, (Grant No.2019B10086).
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Li, F., Zhang, P., Wei, D. et al. The Influence of Loading Rate and Hold Time on the Nano-mechanical Properties of γ-TiAl and Plasma Mo-Si-Ti Coating. J. of Materi Eng and Perform 31, 7368–7381 (2022). https://doi.org/10.1007/s11665-022-06754-z
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DOI: https://doi.org/10.1007/s11665-022-06754-z