Journal of Materials Engineering and Performance

, Volume 28, Issue 10, pp 6354–6364 | Cite as

Synergetic Strengthening of Grain Refinement and Texture in Gradient Zircaloy-4 by Surface Mechanical Rolling Treatment

  • Chao XinEmail author
  • Qiaoyan SunEmail author
  • Lin XiaoEmail author
  • Jun Sun


A Zircaloy-4 rod was subjected to surface mechanical rolling treatment (SMRT) to form a gradient structure, and the evolution of the resulting sub-grain-boundary property and texture across the gradient structure was characterized using electron backscattered diffraction. Dual-gradient structures in grain size and orientation were formed; the grain size was refined from several microns at the center to approximately 400 nm at the topmost surface. Texture analysis revealed that the c-axis gradually tilted from a random orientation toward the parallel-to-radial direction on the radial–tangential plane. The SMRT-induced formation of the dual-gradient microstructure is attributed to the formation of gradient distributions of stress and strain, which resulted in various deformation mechanisms (twinning and dislocation) being active at different depths. During the SMRT process, twinning and dislocations were activated to refine the grains. When the dual-gradient microstructure formed, twinning was mainly activated at the subsurface near the matrix, whereas dislocations were activated across the entire gradient. The geometrically necessary dislocation density increased with decreasing depth and then slightly decreased near the surface. The synergetic strengthening of the dual-gradient microstructure resulted in a gradient distribution of the microhardness near the surface. Thus, the Zircaloy-4 rod exhibited a good combination of strength and ductility.


microhardness microstructure gradient nanomaterials rolling texture gradient Zircaloy-4 



This work was supported by the National Natural Science Foundation of China (Grant Nos. 51471129, 51671158, and 51621063). The authors would also like to thank Dr. X. D. Zhang at the Center for High-Performance Computing, Network Information Center of Xi’an Jiaotong University for assistance with the finite element simulations. The authors also wish to acknowledge the computational resources provided by the HPC platform of Xi’an Jiaotong University. Finally, we thank Tiffany Jain, M.S., from Liwen Bianji, Edanz Group China (, for editing the English text of a draft of this manuscript.


  1. 1.
    T.H. Fang, W.L. Li, N.R. Tao, and K. Lu, Revealing Extraordinary Intrinsic Tensile Plasticity in Gradient Nano-Grained Copper, Science, 2011, 331(6024), p 1587–1590CrossRefGoogle Scholar
  2. 2.
    H. Wei, Y.C. Cui, H.Q. Cui, C.Z. Zhou, L.F. Hou, and Y.H. Wei, Evolution of Grain Refinement Mechanism in Cu-4wt.%Ti Alloy During Surface Mechanical Attrition Treatment, J. Alloys Compd., 2018, 763, p 835–843CrossRefGoogle Scholar
  3. 3.
    N. Ao, D.X. Liu, X.C. Xu, X.H. Zhang, and D. Liu, Gradient Nanostructure Evolution and Phase Transformation of α Phase in Ti-6Al-4V Alloy Induced by Ultrasonic Surface Rolling Process, Mater. Sci. Eng. A, 2019, 742, p 820–834CrossRefGoogle Scholar
  4. 4.
    D. Liu, D.X. Liu, X.H. Zhang, C.S. Liu, and N. Ao, Surface Nanocrystallization of 17-4 Precipitation-Hardening Stainless Steel Subjected to Ultrasonic Surface Rolling Process, Mater. Sci. Eng. A, 2018, 726, p 69–81CrossRefGoogle Scholar
  5. 5.
    Y. Shen, C. Wen, X.C. Yang et al., Ultrahigh Strength Copper Obtained by Surface Mechanical Attrition Treatment at Cryogenic Temperature, J. Mater. Eng. Perform., 2015, 24(12), p 5058–5064CrossRefGoogle Scholar
  6. 6.
    E. Ma and T. Zhu, Towards Strength–Ductility Synergy Through the Design of Heterogeneous Nanostructures in Metals, Mater. Today, 2017, 20, p 323–331CrossRefGoogle Scholar
  7. 7.
    Y.L. Zhang, C. Yang, D.S. Zhou, Y. Zhe, L.F. Meng, X.K. Zhu, and D.L. Zhang, Effect of Stacking Fault Energy on Microstructural Feature and Back Stress Hardening in Cu-Al Alloys Subjected to Surface Mechanical Attrition Treatment, Mater. Sci. Eng. A, 2019, 740, p 235–242CrossRefGoogle Scholar
  8. 8.
    Q. Wang, Q. Sun, L. Xiao et al., Effect of Surface Nanocrystallization on Fatigue Behavior of Pure Titanium, J. Mater. Eng. Perform., 2016, 25(1), p 241–249CrossRefGoogle Scholar
  9. 9.
    J. Moering, X.L. Ma, J. Malkin et al., Synergetic Strengthening Far Beyond Rule of Mixtures in Gradient Structured Aluminum Rod, Scr. Mater., 2016, 122, p 106–109CrossRefGoogle Scholar
  10. 10.
    R. Kalsar and S. Suwas, A Novel Way to Enhance the Strength of Twinning Induced Plasticity (TWIP) Steels, Scr. Mater., 2018, 154, p 207–211CrossRefGoogle Scholar
  11. 11.
    X.L. Wu, P. Jiang, L. Chen, F.P. Yuan, and Y.T. Zhu, Extraordinary Strain Hardening by Gradient Structure, Proc. Natl. Acad. Sci., 2014, 111(20), p 7197–7201CrossRefGoogle Scholar
  12. 12.
    J.J. Li, G.J. Weng, S.H. Chen, and X.L. Wu, On Strain Hardening Mechanism in Gradient Nanostructures, Int. J. Plast., 2017, 88, p 89–107CrossRefGoogle Scholar
  13. 13.
    J. Moering, X.L. Ma et al., The Role of Shear Strain on Texture and Microstructural Gradients in Low Carbon Steel Processed by Surface Mechanical Attrition Treatment, Scr. Mater., 2015, 108, p 100–103CrossRefGoogle Scholar
  14. 14.
    L. Chen, F.P. Yuan et al., Mechanical Properties and Deformation Mechanism of Mg-Al-Zn Alloy with Gradient Microstructure in Grain Size and Orientation, Mater. Sci. Eng. A, 2017, 694, p 98–109CrossRefGoogle Scholar
  15. 15.
    H.H. Yu, C.Z. Li, Y.C. Xin et al., The Mechanism for the High Dependence of the Hall-Petch Slope for Twinning/Slip on Texture in Mg Alloys, Acta Mater., 2017, 128, p 313–326CrossRefGoogle Scholar
  16. 16.
    Y.N. Wang and J.C. Huang, Texture Analysis in Hexagonal Materials, Mater. Chem. Phys., 2003, 81(1), p 11–26CrossRefGoogle Scholar
  17. 17.
    B. Cox, Some Thoughts on the Mechanisms of In-Reactor Corrosion of Zirconium Alloys, J. Nucl. Mater., 2005, 336(2–3), p 331–368CrossRefGoogle Scholar
  18. 18.
    S.J. Zinkle and G.S. Was, Materials Challenges in Nuclear Energy, Acta Mater., 2013, 61(3), p 735–758CrossRefGoogle Scholar
  19. 19.
    L. Xiao, Y. Umakoshi, and J. Sun, Biaxial Low Cycle Fatigue Properties and Dislocation Substructures of Zircaloy-4 Under In-Phase and Out-of-Phase Loading, Mater. Sci. Eng. A, 2000, 292, p 40–48CrossRefGoogle Scholar
  20. 20.
    V. Mallipudi, S. Valance, and J. Bertsch, Meso-scale Analysis of the Creep Behavior of Hydrogenated Zircaloy-4, Mech. Mater., 2012, 51, p 15–28CrossRefGoogle Scholar
  21. 21.
    M. Tupin, R. Verlet et al., Effect of Ion Irradiation of the Metal Matrix on the Oxidation Rate of Zircaloy-4, Corros. Sci., 2018, 136, p 28–37CrossRefGoogle Scholar
  22. 22.
    W.C. Bao, J.X. Xue et al., Coating SiC on Zircaloy-4 by Magnetron Sputtering at Room Temperature, J. Alloys Compd., 2018, 730, p 81–87CrossRefGoogle Scholar
  23. 23.
    M. Zha, Y.J. Li, R.H. Mathiesen et al., Microstructure Evolution and Mechanical Behavior of a Binary Al-7Mg Alloy Processed by Equal-Channel Angular Pressing, Acta Mater., 2015, 84, p 42–54CrossRefGoogle Scholar
  24. 24.
    A. Basak and A. Gupta, Simultaneous Grain Boundary Motion, Grain Rotation, and Sliding in a Tricrystal, Mech. Mater., 2015, 90, p 229–242CrossRefGoogle Scholar
  25. 25.
    J.C. Gong and A.J. Wilkinson, Sample Size Effects on Grain Boundary Sliding, Scr. Mater., 2016, 114, p 17–20CrossRefGoogle Scholar
  26. 26.
    R. Armstrong, I. Codd, R.M. Douthwaite, and N.J. Petch, The Plastic Deformation of Polycrystalline Aggregates, Philos. Mag., 1962, 7(73), p 45–58CrossRefGoogle Scholar
  27. 27.
    S.G. Song and G.T. Gray, Influence of Temperature and Strain Rate on Slip and Twinning Behavior of Zr, Metall. Mater. Trans. A, 1995, 26(10), p 2665–2675CrossRefGoogle Scholar
  28. 28.
    F. Xu, R.A. Holt, and M.R. Daymond, Modeling Lattice Strain Evolution During Uniaxial Deformation of Textured Zircaloy-2, Acta Mater., 2008, 56(14), p 3672–3687CrossRefGoogle Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’anPeople’s Republic of China

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