Surface Roughness and Deformation of Grain during Tensile Plastic Deformation of Polycrystalline Titanium

Abstract:

The surface folds formed due to plastic deformation and the deformation behaviors of two kinds of polycrystalline titanium with grain sizes of about 30µm and 150µm respectively have been consecutively observed and measured by the scanning probe microscope. The results show that the surface folds in two kinds of specimens were increased with the increase of strain, but their relative position were kept unchanged during deformation. A large amount of twins were formed in each grain when the plastic strain reached about 0.1,which resulted in some new plastic folds. However, these new plastic folds had no influence on the positions of the plastic folds in both specimens as a whole. The roughness, the maximum height difference, and the averaged slope angle of the microscope surface profile increase with the applied tensile strain. But the surface roughness of the specimens with large grains are 1.4 to 4 times higher than that of the specimens with small grains. Two sudden changes in roughness could be observed in the specimens with large grains while the roughness in the specimens with small grains were kept smoothly increased. The influence of grain size on the plastic mechanism and surface roughness were discussed.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 573-576
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.573
• Online since: January 2005
• Authors: Yan Li, Takeji Abe
• Keywords: Atomic Force Microscope (AFM), Plastic Deformation, Polycrystalline Titanium, Surface Roughness (SR)

References

[1] Takeji Abe, Shigeru Nagaki and Yutaka Okabe, Inhomogeneous deformation of grains and roughening of free surface of polycrystalline copper during compressive plastic deformation[J], Transactions of the Japan Society of Mechanical Engineers，1984，A-51, 2036-2041.

DOI: 10.1299/kikaia.51.2036

[2] Takeji Abe, Ichiro Shimizu and Taiyo Nishiyama，Three-dimensional observation of roughening of free surface during compressive plastic deformation of polycrystalline iron [J], Transactions of the Japan Society of Mechanical Engineers，1991，A-57, 2587-2596.

DOI: 10.1299/kikaia.57.2587

[3] Ichiro Shimizu and Takeji Abe，Surface roughening and deformation of grain during compressive plastic deformation of polycrystalline iron [J], Transactions of the Japan Society of Mechanical Engineers，1994，A-60: 2369-2375.

DOI: 10.1299/kikaia.60.2369

[4] Ichiro Shimizu and Takeji Abe，Three dimensional evaluation of free surface roughening topography of aluminum sheet during various plastic strain paths [J], Transactions of the Japan Society of Mechanical Engineers，2001， A-67: 1761-1768.

DOI: 10.1299/kikaia.67.1760

[5] Y. Li, T. Abe, N. Tada and M. Kanazawa，Continuous observation of tensile deformation of polycrystalline pure titanium by scanning probe microscope [J]Journal of Japan Institute of Light Metals, 2003, 53 (7), 295-301.

DOI: 10.2464/jilm.53.295

[6] Y. Li, T. Abe and N. Tada, Continuous observation of tensile deformation of polycrystalline titanium by scanning probe microscope [J]. Journal of the society of materials science Japan，2003, 52 (10): 1174-1179.

DOI: 10.2472/jsms.52.1174

[7] T. Abe, Y. Li and N Tada, Observation of Tensile Deformation Behavior of Polycrystalline Titanium with Scanning Probe Microscope [J], Key Engineering Materials, 2003, 233-236: 529-534.

DOI: 10.4028/www.scientific.net/kem.233-236.529

[8] Y. Li, T. Abe, N. Tada and M. Kanazawa, Microscopic Observation of Tensile Deformation Behavior of Polycrystalline Titanium by Probe Microscope [J], Memoirs of Faculty of Engineering, Okayama University, 2001, 36 (1).

DOI: 10.4028/www.scientific.net/kem.233-236.529