Material deformation mechanism of lamellar twined high-entropy alloys during machining

TN Vu and V Pham and TH Fang, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, 32, 035009 (2024).

DOI: 10.1088/1361-651X/ad2541

The effects of sample structure and tool geometry are studied under cutting simulation to verify the deformation, removal mechanisms, and subsurface defection of lamellar twined CoCuFeNiPd alloys. These findings suggest that the twin boundary spacing (TBS) and twin inclination angle (beta) are the main determinants of surface wear characteristics and cutting-induced surface harm. The maximum cutting force achieved with TBS = 8a and beta = 90 degrees. The high friction coefficient with the sample has TBS = 8a and beta = 90 degrees, showing that the tool's moving in the substrate is strongly restricted. Furthermore, the surface topography is not sensitive to the TBS and beta. The best-machined surface is achieved with TBS = 3a and 4a under twin inclinations of 0 degrees and 30 degrees. The effect of edge radius (R), rake angle (gamma), and clearance angle (alpha) on the deformation behavior is examined. The negative of gamma, small alpha, or larger R results in a higher cutting force, a worse subsurface, and a lower cutting pile-up height. With a positive gamma, a large alpha or small R has a larger average friction coefficient, which implies a higher resistance rate. The tool with a smaller R or positive gamma can improve the machined surface's smoothness.

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