Research on Mechanism of Surface Nanocrystalline Layer in 2219 Al Alloy Induced by Supersonic Fine Particles Bombarding

Abstract:

A nanostructured surface layer is formed on 2219 Al alloy plate by means of supersonic fine particles bombarding (SFPB). The surface microstructure formation mechanism of morphology change is systematically characterized by using scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The average grain size of 30nanostructured layer is about 30 nm when the surface of sample is induced by severe plastic deformation. Based on the experimental observations, nanoscale dislocation cells exist in strain layer about 200 from the surface, and we put forward a new formation mechanism of Al alloy surface nanocrystalline layer through theoretical analysis. The original grain is segmented fast into nanoscale dislocation cell or lamellar cell. As the Burgers vector of cell walls continue to accumulate, grain orientation difference constantly increases to form the nanoscale subboundary. Eventually, equiaxed nanocrystallites with random crystallographic orientations are formed by grain rotating or grain boundary sliding.

• Periodical: International Journal of Engineering Research in Africa (Volume 24)
• Pages: 1-8
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.24.1
• Online since: June 2016
• Authors: Yu Xiang Zhang*, Jian Hai Yang, Li Ling Ge, Xin Zhang, Jia Zhao Chen
• Keywords: Aluminum Alloy, Mechanism, Nanocrystalline Layer, Supersonic Fine Particles Bombarding

References

[1] K Lu, J Lu. Surface nanocrystallization of metallic material Presentation of the concept behind a new approach. Journal of Materials Science & Technology, 1999, 15(3): 193-197.

[2] K Lu, J Lu. Nanostructured surface layes on metallic materials induced by surface mechanical attrition treatment. Materials Science and Engineering, 2004, 375(1): 38-45.

DOI: 10.1016/j.msea.2003.10.261

[3] Liao Libao. Research on method and property of metal surface nanocrystallization. Doctorial degree thesis of East China University of Science and Technology，(2011).

[4] N. A. Prakash, R. Gnanamoorthy, M. Kamaraj. Surface nanocrystallization of aluminium alloy by controlled ball impact technique. Surface & Coatings Technology, 2012, 210(8): 78-89.

DOI: 10.1016/j.surfcoat.2012.08.069

[5] H. P. Klug, L. E. Alexander. X-ray diffraction procfor polycrystalline and amorphous materials. NewYork: John Wiley & Sons Wiley, 1974: 491-494.

[6] D. Jia, L. Q. Hu. Study on Nano-crystallization Technology and Its Mechanism of A1-lloy Surface. Material and Heat Treatment. 2012, 41(8): 144-146.

[7] T. X. Zou. Iinvestigation on Grain Refinement Mechanism and Dynamic Mechanical Properties of Pure Aluminum. Tai Yuan University of Technology (China), 2008, 60-61.

[8] N. R. Tao, Z. B. Wang, W. P. Tong, et al. An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment. Acta Materialia. 2002, 50(18): 4603-4616.

DOI: 10.1016/s1359-6454(02)00310-5

[9] M. Cheng, D. Zhang, H. Chen, et al. Surface nanocrystallization and its effect on fatigue performance of high-strength materials treated by ultrasonic rolling process. International Journal of Advanced Manufacturing Technology. 2016, 83(1): 123-131.

DOI: 10.1007/s00170-015-7485-4

[10] H. Q. Ye, X. M. Fan. Surface nanocrystallization of 7A04 aluminum alloy induced by circulation rolling plastic deformation. Trans Nonferrous Met SOC China, 2006, 16(6): 656-660.

DOI: 10.1016/s1003-6326(06)60272-0

[11] L. L. Ge, Z. W. Yuan, X. T. Jing, Z. X. Lu. Study of Pure Titanium (TA2) Surface Nanocrystallization and Its Thermal Stablity. Rare Metal Materials and Engineering, 2011, 40(7): 1239-1242.

[12] K. Y. Zhu, A. Vassel, F. Brisset, et al. Nanostructure formation mechanism of a-titanium using SMAT. Acta Mater, 2004, 52(14): 4101-4110.

DOI: 10.1016/j.actamat.2004.05.023

[13] Y. Sun, R. Baliley. Improvement in tribocorrosion behavior of 304 stainless steel by surface mechanical attrition treatment. Surf Coat Technol, 2014, 253(9): 284-291.

DOI: 10.1016/j.surfcoat.2014.05.057

[14] S. Jelliti, C. Richard, D. Retraint, et al. Effect of surface nanocrystallization on the corrosion behavior of Ti–6Al–4V titanium alloy. Surface & Coatings Technology, 2013, 224(7): 82-87.

DOI: 10.1016/j.surfcoat.2013.02.052