CN 41-1243/TG ISSN 1006-852X
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doi: 10.13394/j.cnki.jgszz.2022-0001
  • Received Date: 2022-01-25
  • Accepted Date: 2022-04-19
  • Rev Recd Date: 2022-04-11
  • Available Online: 2022-05-11
  • The new high temperature γ-TiAl alloy has low density and high specific strength, and has broad application prospects in the field of engine blades. In order to study the influence mechanism of machining process parameters (cutting speed and depths of cut) on the surface quality and subsurface damage of nano-cutting single crystal γ-TiAl alloy, molecular dynamics(MD) was used as the basic theory. Using a non-rigid diamond tool, a three-dimensional nano-cutting model was established, and the influence of different cutting speeds and depths of cut on the surface and subsurface structure were analyzed in detail by studying chip volume, surface roughness, workpiece hydrostatic pressure distribution, dislocation density, dislocation evolution, and phase transitions atomic number. The results showed that with the increase of cutting speed, the chip volume increases, the surface roughness first decreases and then increases but there is a critical value, the complexity of dislocations and the density of dislocations decrease, and the degree of plastic deformation increases; however, with the increase of cutting depth, the surface roughness, the density of dislocations and the degree of plastic deformation increase significantly, and it was found that the dislocations were mainly distributed in front of and below the tool during cutting process, and there were V-shaped dislocations and Stair rod dislocations in the direction of 45o in front of the tool, as well as dislocations reacting with each other, and stable defects such as vacancies and atomic clusters remained after the cutting process.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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