Effect of Coarse-Grained Ring on Mechanical Properties and Cutting Performance of 2011 Aluminum Alloy Extruded Bar

Abstract:

The effects of coarse-grained ring on the mechanical properties and cutting performance of 2011 aluminum alloy extruded bars were studied by metallographic microscope, scanning electron microscope, tensile testing machine and high-speed lathe. The results show that the microstructure of aluminum alloy extruded bar was composed of α-Al phase, Al₇Cu₂Fe phase, CuAl₂ phase and SnBi eutectic phase. There was a coarse-grained ring in the aluminum alloy extruded bar. The coarse-grained ring reduced the mechanical properties and cutting performance of the aluminum alloy extruded bar. The aluminum alloy extruded bar with a diameter of 30 mm had a coarse-grained ring depth of 9 mm and lower mechanical properties, whose the tensile strength was 287.9 MPa, the elongation was 17%, the cutting performance was poor and the chips were long. The aluminum alloy extruded bar with a diameter of 40 mm had a coarse-grained ring depth of 1 mm, higher mechanical properties and better cutting performance, whose the tensile strength was 394.5 MPa, the elongation was 23.5%, the chips were fine and uniform.

• Periodical: Materials Science Forum (Volume 1035)
• Pages: 114-118
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1035.114
• Online since: June 2021
• Authors: Chang Liang Shi, Yan Ping Niu, Yi Min Lin*, Quan Hu, Xin Zhang
• Keywords: 2011 Aluminum Alloy, Coarse-Grained Ring, Cutting Performance, Extrusion

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