Nitridation of γ-TiAl alloys by direct metal-gas reaction at 1000-1300 K
Two γ-TiAl alloys, Ti-47at%Al-2at%Nb-2at%Cr (MJ12) and Ti-47at%Al-2at%Nb-2at%Mn-0.8at%TiB2 (MJ47), were nitrided by direct metal-gas reaction at 1000-1300 K in 10 cm3s-1NH 3. X-ray diffraction revealed formation of TiN at 1100-1300 K. Knoop microhardness values of the alloys were increased with an i...
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| Main Authors: | , , , |
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| Format: | Journal |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=24944549943&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/62129 |
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| Institution: | Chiang Mai University |
| Summary: | Two γ-TiAl alloys, Ti-47at%Al-2at%Nb-2at%Cr (MJ12) and Ti-47at%Al-2at%Nb-2at%Mn-0.8at%TiB2 (MJ47), were nitrided by direct metal-gas reaction at 1000-1300 K in 10 cm3s-1NH 3. X-ray diffraction revealed formation of TiN at 1100-1300 K. Knoop microhardness values of the alloys were increased with an increase in the nitridation temperature. Microhardness values of MJ12 and MJ47 with 1300 K nitridation were respectively improved to 1.65 and 1.38 times those of the controls. Nitridation depth at a variety of temperature determined by Rutherford backscattering spectrometry was increased with an increase in the temperature. Ti, Al and N concentrations at a variety of depths analysed by scanning electron microscopy and energy dispersive X-ray linescanning are also explained. Copyright © 2005 John Wiley & Sons, Ltd. |
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