Thermal stability of a submicrocrystalline structure formed by high-pressure torsion in Ni and Ni–2 % Cr alloy

Cover Page

Cite item

Full Text

Abstract

The main problem of submicrocrystalline (SMC) materials formed as a result of large plastic deformation is their thermal stability. The large stored energy and the formation of strongly disordered microcrystallites in the structure lead to a decrease in the recrystallization onset temperature and, therefore, possibly decrease the structure stability. In the work, severe plastic deformation by high-pressure torsion and annealing of pure nickel and an alloy containing 2 at. % chromium were carried out. The structure of both deformed and annealed material was studied by scanning and transmission electron microscopy. The dependence of hardness on the square root of true strain and structure evolution were analyzed to identify the boundaries of the stages of structural states. The energy stored during deformation was estimated using differential scanning calorimetry by the amount of absorbed heat energy. The author studied the behaviour of materials during annealing depending on the stored strain energy at the SMC structure stage. Three stages of structural stats were identified in pure nickel: cellular, mixed, and SMC structure, while in the alloy containing 2 at. % chromium, a cellular structure stage was not detected. A decrease in the stored strain energy was found at the stage of the SMC structure for both materials. Alloying nickel with 2 at. % chromium increases its thermal stability, which increases the temperature when the grain growth becomes intensive by 150 °C. The amount of stored strain energy affects grain growth in the alloy containing 2 at. % chromium, whereas in pure nickel no effect was detected. In the Ni–Cr alloy, greater stored energy corresponds to larger recrystallized grain size.

About the authors

Konstantin Yurievich Karamyshev

M.N. Mikheev Institute of Metal Physics of the Ural Branch of RAS, Yekaterinburg

Author for correspondence.
Email: karamyshev.imp@mail.ru
ORCID iD: 0009-0000-1752-2284

engineer of the Laboratory of Precision Alloys and Intermetallic Compounds

Россия

References

  1. Valiev R.Z., Islamgaliev R.K., Alexandrov I.V. Bulk Nanostructured Materials from Severe Plastic Deformation. Progress in Materials Science, 2000, vol. 45, no. 2, pp. 103–189. doi: 10.1016/S0079-6425(99)00007-9.
  2. Valiev R.Z., Estrin Yu., Horita Z., Langdon T.G., Zehetbauer M.J., Zhu Yuntian. Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later. JOM, 2016, vol. 68, pp. 1216–1226. doi: 10.1007/s11837-016-1820-6.
  3. Cao Yang, Ni Song, Liao Xiaozhou, Song Min, Zhu Yuntian. Structural evolutions of metallic materials processed by severe plastic deformation. Materials Science and Engineering: R: Reports, 2018, vol. 133, pp. 1–59. doi: 10.1016/j.mser.2018.06.001.
  4. Valiev R.Z., Straumal B., Langdon T.G. Using Severe Plastic Deformation to Produce Nanostructured Materials with Superior Properties. Annual Review of Materials Research, 2022, vol. 52, pp. 357–382. doi: 10.1146/annurev-matsci-081720-123248.
  5. Zhilyaev A.P., Langdon T.G. Using High-Pressure Torsion for Metal Processing: Fundamentals and Applications. Progress in Materials Science, 2008, vol. 53, no. 6, pp. 893–979. doi: 10.1016/j.pmatsci.2008.03.002.
  6. Degtyarev M., Chashchukhina T., Voronova L., Gapontseva T., Levit V. Evolution of microstructure and microtexture upon recrystallization of submicrocrystalline niobium. International Journal of Refractory Metals and Hard Materials, 2020, vol. 86, article number 105117. doi: 10.1016/j.ijrmhm.2019.105117.
  7. Smirnova N.A., Levit V.I., Pilyugin V.P., Kuznetsov R.I., Davydova L.S., Sazonova V.A. Evolution of the structure of F.C.C. single crystals under high plastic deformations. Fizika metallov i metallovedenie, 1986, vol. 61, no. 6, pp. 1170–1177. EDN: UCKEJT.
  8. Gapontseva T.M., Degtyarev M.V., Pilyugin V.P., Chashchukhina T.I., Voronova L.M., Patselov A.M. Effect of temperature of HPT deformation and the initial orientation on the structural evolution in single-crystal niobium. The Physics of Metals and Metallography, 2016, vol. 117, no. 4, pp. 336–347. doi: 10.1134/S0031918X16040062.
  9. Voronova L.M., Chashchukhina T.I., Gapontseva T.M., Patselov A.M., Pilyugin V.P., Degtyarev M.V. Effect of single-crystal orientation on the molybdenum structure and hardness upon high pressure torsion. International Journal of Refractory Metals and Hard Materials, 2022, vol. 103, article number 105754. doi: 10.1016/j.ijrmhm.2021.105754.
  10. Chuvildeev V.N., Kopylov V.I., Nokhrin A.V., Makarov I.M., Gryaznov M.Yu. Recrystallization in microcrystalline copper and nickel produced by equal-channel angular pressing: III. Abnormal grain growth: a model. The Physics of Metals and Metallography, 2004, vol. 97, no. 1, pp. 1–6. EDN: LIRFML.
  11. Zhou Xin, Li Xiuyan, Lu Ke. Stabilizing nanograins in metals with grain boundary relaxation. Scripta Materialia, 2020, vol. 187, pp. 345–349. doi: 10.1016/j.scriptamat.2020.06.047.
  12. Zhou Xin, Li Xiuyan, Lu Ke. 70 nm: The most unstable grain size in Cu prepared by surface mechanical grinding treatment. Nano Materials Science, 2020, vol. 2, no. 1, pp. 32–38. doi: 10.1016/j.nanoms.2020.01.001.
  13. Zhou Xin, Li Xiuyan, Lu Ke. Enhanced thermal stability of nanograined metals below a critical grain size. Science, 2018, vol. 360, no. 6388, pp. 526–530. doi: 10.1126/science.aar6941.
  14. Degtyarev M.V., Voronova L.M., Gubernatorov V.V., Chashchukhina T.I. On the thermal stability of the microcrystalline structure in single-phase metallic materials. Doklady Physics, 2002, vol. 47, no. 9, pp. 647–650. doi: 10.1134/1.1512627.
  15. Voronova L.M., Degtyarev M.V., Chashchukhina T.I. Recrystallization of the ultradispersed structure of pure iron formed at different stages of the deformation-induced strain hardening. The Physics of Metals and Metallography, 2007, vol. 104, no. 3, pp. 262–273. doi: 10.1134/S0031918X07090086.
  16. Guo X.K., Luo Z.P., Li X.Y., Lu K. Plastic deformation induced extremely fine nano-grains in nickel. Materials Science and Engineering: A, 2021, vol. 802, article number 140664. doi: 10.1016/j.msea.2020.140664.
  17. Makarov A.V., Korshunov L.G. Metallophysical foundations of nanostructuring frictional treatment of steels. The Physics of Metals and Metallography, 2019, vol. 120, no. 3, pp. 303–311. doi: 10.1134/S0031918X18120128.
  18. Haessner F. Recrystallization of Metallic Materials. Stuttgart, Riederer-Verlag Publ., 1978. 293 p.
  19. Degtyarev M.V., Pilyugin V.P., Chashchukhina T.I., Voronova L.M. Structure of iron deformed at 250°С by torsion under a pressure. The Physics of Metals and Metallography, 2019, vol. 120, no. 12, pp. 1193–1199. doi: 10.1134/S0031918X19120044.
  20. Trefilov V.I., Moiseev V.F., Pechkovskiy E.P., Gornaya I.D., Vasilev A.D. Deformatsionnoe uprochnenie i razrushenie polikristallicheskikh metallov [Work Hardening and Fracture of Polycrystalline Metals]. Kiev, Naukova dumka Publ., 1987. 248 p.
  21. Lee Seungwon, Horita Z. High-Pressure Torsion for Pure Chromium and Niobium. Materials Transactions, 2012, vol. 53, no. 1, pp. 38–45. doi: 10.2320/matertrans.MD201131.
  22. Zhang Yubin, Mishin O.V. Stored energy and recrystallized microstructures in nickel processed by accumulative roll bonding to different strains. Materials Characterization, 2017, vol. 129, pp. 323–328. doi: 10.1016/j.matchar.2017.05.024.
  23. Langdon T.G. Twenty-five years of ultrafine-grained materials: Achieving exceptional properties through grain refinement. Acta Materialia, 2013, vol. 61, no. 19, pp. 7035–7059. doi: 10.1016/j.actamat.2013.08.018.
  24. Dudova N., Belyakov A., Kaibyshev R. Recrystallization behavior of a Ni–20%Cr alloy subjected to severe plastic deformation. Materials Science and Engineering: A, 2012, vol. 543, pp. 164–172. doi: 10.1016/j.msea.2012.02.067.

Supplementary files

Supplementary Files
Action
1. JATS XML
Download

Copyright (c)



This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies