Effects of Ce Addition on Mechanical Properties and Microstructures of Mo Alloy Wires

  • Pengfa Feng
  • Xiaoming Dang
  • Na Wang
  • Qinli Yang
  • Weicheng Cao
Conference paper


The effects of Ce addition on mechanical properties and microstructures of Mo–Ce alloy wires were investigated. The results show that the yield strength (Rp), tensile strength (Rm) and elongation to failure (A%) of Mo–Ce alloy wires were sensitive to the Ce content. When the Ce content was less than 0.03 wt%, Rp, Rm and A% did not change significantly as comparing with the unalloyed molybdenum wires; when the Ce content was ranging from 0.06 to 0.09 wt%, Rp and Rm gradually increased, and the decreasing of A% was accompanied; when the Ce content was ranging from 0.09 to 0.12 wt%, the maximum A% and moderate Rp and Rm were obtained; when the Ce content was ranging from 0.15 to 0.3 wt%, Rp, Rm and A% decreased simultaneously. The optical microstructures of as-sintered Mo–Ce alloys show that the grain sizes of Mo–Ce alloys were 20–30 μm, which were almost equivalent to one quarter of those of unalloyed molybdenum. In addition, the TEM and XRD analyses show that Ce element homogeneously dispersed in the intra- and inter-granular molybdenum substrate in the form of CeO2 particles during the whole preparation processing. Due to that the lattices of CeO2 particles were partly coherent with the molybdenum matrix, they not only had the significant grain refinement and dispersion strengthening effects, but also served to inhibit the brittle-to-ductile transition behaviors of Mo alloys during the subsequent thermo-mechanical procedure. Therefore, the comprehensive mechanical properties of Mo–Ce alloys are much superior to those of the other oxide-dispersion-strengthened molybdenum alloys.


CeO2 Dispersion strengthening Fine grain Lattice misfit Molybdenum 



This work is supported by National Key R&D Program of China (grant No. 2017YFB0306003) and Shaanxi Science and Technology Co-ordination and Innovation Project (grant No. 2016KTCQ 01-96).


  1. 1.
    T. Mrotzek, A. Hoffmann and U. Martin, Hardening mechanisms and recrystallization behaviour of several molybdenum alloys, Int. J. Refract. Met. Hard Mater. 24 (2006) 298–305.Google Scholar
  2. 2.
    J.L. Garin, R.L. Mannheim, Manufacturing of Mo-25Re and Mo-50Re alloys by means of powder sintering at medium temperature, Mater. Manuf. Processes. 13 (1998) 731–747.Google Scholar
  3. 3.
    S.R. Agnew, T. Leonhardt, The low-temperature mechanical behavior of molybdenum-rhenium, J. Met. 55 (2003) 25–29.Google Scholar
  4. 4.
    A.Yu. Koval, A.D. Vasilev and S.A. Firstov, Fracture toughness of molybdenum sheet under brittle-ductile transition, Int. J. Refract. Met. Hard Mater. 15 (1997) 223–226.Google Scholar
  5. 5.
    Yu.R. Kolobov, B. Kieback and K.V. Ivanov, The structure and microhardness evolution in submicrocrystalline molybdenum processed by severe plastic deformation followed by annealing, Int. J. Refract. Met. Hard Mater. 21 (2003) 69–73.Google Scholar
  6. 6.
    A. Kumar, B.L. Eyrej, Grain boundary segregation and intergranular fracture in molybdenum, Proc. R. Soc. Lond. A 370 (1980) 431–458.Google Scholar
  7. 7.
    J.X. Zhang, L. Liu M.L. Zhou, Y.C. Hu and T.Y. Zuo, Fracture toughness of sintered Mo-La2O3 alloy and the toughening mechanism, Int. J. Refract. Met. Hard Mater. 17 (1999) 405–409.Google Scholar
  8. 8.
    G.J. Zhang, G. Liu, Y.J. Sun, F. Jiang, L. Wang, R.H. Wang and J. Sun, Microstructure and strengthening mechanisms of molybdenum alloy wires doped with lanthanum oxide particles, Int. J. Refract. Met. Hard Mater. 27 (2009) 173–176.Google Scholar
  9. 9.
    K.Y. Myoung, H. Yutaka and C. Ju, Recrystallization of molybdenum wire doped with lanthanum oxide, Int. J. Refract. Met. Hard Mater. 13 (1995) 221–227.Google Scholar
  10. 10.
    T.G. Xiang, Molybdenum Alloys, 2nd ed., Central South University Press, Changsha, 2002.Google Scholar
  11. 11.
    P.F. Feng, R.Z. Liu, H. Zhao, Q.L. Yang, J.B. Fu, J. Sun, Effect of Si and La additions on the microstructure and mechanical properties of molybdenum wire, P/M Technol. 26 (2011) 328–333.Google Scholar
  12. 12.
  13. 13.
    P.F. Feng, J.B. Fu, R.Z. Liu, H. Zhao, Q.L. Yang, J. Sun, Analysis on time sequence characteristics of occurrence status of lanthanum in Mo alloy wires, Chin. J. Rare Metals. 35 (2011) 486–490.Google Scholar
  14. 14.
    J.W. Wang, W.Z. Zhao, Y.J. Sun and P.W. Song, Effect of CeO2 on Mechanical Performance of Molybdenum Alloys, J. Chin. Rare Earth Soc. 23 (2005) 128–131.Google Scholar
  15. 15.
    L. Zhong and Y.H. Xing, Effects of Ce element on mechanical properties and microstructures of Mo and its alloys, Chin. Rare Earth. 5 (1987) 53–55.Google Scholar
  16. 16.
    J.S. Mohammed, A study of high temperature reactions in oxide- dispersion-strengthened molybdenum at reduced oxygen partial pressures, Georgia Institute of Technology, Atlanta, 2004.Google Scholar
  17. 17.
    H.П. Лякишeв, Manual of Metal Binary Phase Diagram, Chemical Industry Press, Beijing, 2009.Google Scholar
  18. 18.
    H. Nasser, Á Rédey, Tatiana Yuzhakova and J. Kovács, Thermal stability and surface structure of Mo/CeO2 and Ce-doped Mo/Al2O3 catalysts, J. Therm. Anal. Calorim. 95 (2009) 69–74.Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Pengfa Feng
    • 1
  • Xiaoming Dang
    • 1
  • Na Wang
    • 1
  • Qinli Yang
    • 1
  • Weicheng Cao
    • 1
  1. 1.Jinduicheng Molybdenum Co., Ltd.Xi’anChina

Personalised recommendations