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Enhanced oxidation resistance of MoTaTiCrAl high entropy alloys by removal of Al

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  • ReceivedMar 6, 2020
  • AcceptedApr 5, 2020
  • PublishedJun 9, 2020

Abstract


Funded by

the National Key Research and Development Program of China(2018YFA0703600)

the National Science Fund for Distinguished Young Scholars(51825104)

the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(QYZDY-SSW-JSC017)

the Strategic Priority Research Program of Chinese Academy of Sciences(XDB30000000)

the Key Basic and Applied Research Program of Guangdong Province

China(2019B030302010)

and the National Natural Science Foundation of China(11790291,61888102)


Acknowledgment

This work was supported by the National Key Research and Development Program of China (2018YFA0703600), the National Science Fund for Distinguished Young Scholars (51825104), the Key Research Program of Frontier Sciences of Chinese Academy of Sciences (QYZDY-SSW-JSC017), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB30000000), the Key Basic and Applied Research Program of Guangdong Province, China (2019B030302010), and the National Natural Science Foundation of China (11790291 and 61888102).


Interest statement

The authors declare no competing interest.


Contributions statement

Liu YH conceived the research. Li LC, Li MX, and Liu YH designed the experiments. Li LC performed the experiments with assistance from Liu M and Sun BY. Li LC, Liu YH, Wang C analyzed the data. Li LC and Liu YH wrote the paper with input from Wang C, Li MX, Huo JT and Wang WH. All authors contributed to the general discussion.


Author information

Li-Chao Li is currently a PhD candidate in condensed matter physics under the supervision of Professor Yan-Hui Liu at the Institute of Physics, Chinese Academy of Sciences. He received his BSc degree in physics from Lanzhou University in 2015. His research focuses on the phase formation and properties of high entropy alloys.


Yan-Hui Liu received his PhD degree from the Institute of Physics, Chinese Academy of Sciences. From 2007 to 2016, he conducted research in Tohoku University (Japan) and Yale University (USA). He joined the Institute of Physics, Chinese Academy of Sciences as an associate professor in 2016, and was promoted to professor in 2018. His research focuses on the development of high-performing alloys, in particular, metallic glasses and high-entropy alloys, by combinatorial approaches.


References

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  • Figure 1

    XRD patterns of the studied alloys (a) and microstructures observed by SEM for MoTaTi (b), MoTaTiAl (c), MoTaTiCr (d), and MoTaTiCrAl (e), respectively.

  • Figure 2

    (a) Changes of sample appearances after 10 h isothermal exposure in air at different temperatures, and (b) mass gain curves measured by TGA at 1000°C for MoTaTi, MoTaTiCr, MoTaTiAl, and MoTaTiCrAl alloys.

  • Figure 3

    XRD patterns of the surface layers of the studied alloys after isothermal exposure in air for 10 h at 900°C for MoTaTi and 1000°C for MoTaTiAl, MoTaTiCr, and MoTaTiCrAl.

  • Figure 4

    Cross-section images and the corresponding chemical analyses by EDX mappings after isothermal exposure in air for 10 h at 900°C for MoTaTi (a), and 1000°C for MoTaTiAl (b), MoTaTiCrAl (c), and MoTaTiCr (d).

  • Figure 5

    Chemical analyses by EDX line scan along the black line shown in Fig. 4. (a, e) MoTaTi; (b, f) MoTaTiAl; (c, g) MoTaTiCrAl; (d, h) MoTaTiCr. The panels from (e–h) show the relative concentration of each constituent elements without taking oxygen into account.

  • Table 1   Summary of atomic size difference (δ), mixing enthalpy (∆Hmix), and mixing entropy (∆Smix) for MoTaTi, MoTaTiAl, MoTaTiCr, and MoTaTiCrAl

    MoTaTi

    MoTaTiAl

    MoTaTiCr

    MoTaTiCrAl

    δ

    2.91

    2.55

    5.93

    5.50

    Hmix (kJ mol−1)

    −3.5

    −15.5

    −5.5

    −13.8

    Smix (J K−1 mol−1)

    9.13

    11.53

    11.53

    13.38

  • Table 2   Compositions (at.%) of MoTaTi, MoTaTiAl, MoTaTiCr, and MoTaTiCrAl measured by EDX

    Alloy

    Region

    Mo

    Ta

    Ti

    Cr

    Al

    MoTaTi

    Overall

    32.17

    33.62

    34.21

    Bright

    34.80

    39.35

    25.86

    Dark

    29.57

    23.59

    46.84

    MoTaTiAl

    Overall

    24.65

    23.90

    27.00

    24.45

    Bright

    27.61

    27.30

    23.30

    21.79

    Dark

    23.50

    20.01

    29.09

    27.40

    MoTaTiCr

    Overall

    24.34

    24.63

    28.51

    22.52

    Bright

    32.83

    34.63

    19.56

    12.99

    Dark

    13.41

    13.27

    36.30

    37.03

    MoTaTiCrAl

    Overall

    19.73

    19.70

    22.27

    18.67

    19.63

    Bright

    25.23

    26.37

    16.50

    12.60

    19.30

    Dark

    18.39

    18.81

    20.60

    17.93

    24.26

  • Table 3   Calculated PBR for the oxides formed in the alloys

    Alloy

    MoTiTa8O25

    TiO2

    CrTaO4

    Al2O3

    MoTaTi

    2.80

    1.86

    MoTaTiCr

    2.92

    1.94

    2.01

    MoTaTiAl

    2.84

    1.90

    1.24

    MoTaTiCrAl

    2.95

    1.96

    2.02

    1.29

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