Mechanical properties of friction stir welded Al alloys with different hardening mechanisms |
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Authors: | Sunggon Lim Sangshik Kim Chang-Gil Lee Sung Joon Kim |
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Affiliation: | (1) Division of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, 900 Gazwa-dong, 660-701 Jinju, Korea;(2) Institute of Materials Science and Technology, Korea Institute of Machinery and Materials (KIMM), 66 Sangnam-dong, 641-010 Changwon, Korea |
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Abstract: | The mechanical properties of precipitation hardened Al 6061-T651 and Al 7075-T6 and strain hardened Al 5083-H32, friction
stir welded with various welding parameters, were examined in the present study. 4 mm thick Al 6061-T651, Al 7075-T6, and
Al 5083-H32 alloy plates were used for friction stir welding (FSW) with rotating speed varied from 1000 to 2500 rpm (rotation
per minute) and welding speed ranging from 0.1 to 0.4 mpm (m/min). Each alloy displayed slightly different trends with respect
to the effect of different welding parameters on the tensile properties of the FSWed Al alloys. The tensile elongation of
FSWed Al 6061-T651 and Al 7075-T6 tended to increase greatly, while the tensile strength decreased marginally, with increasing
welding speed and/or decreasing rotating speed. The tensile strength and the tensile elongation of Al 6061-T651 decreased
from 135 to 154 MPa and 10.6 to 17.0%, respectively, with increasing welding speed from 0.1 to 0.4 mpm at a rotating speed
of 1,600 rpm. Unlike the age-hardened Al 6061-T651 and Al 7075-T6, the strain-hardened Al 5083-H32 showed no notable change
in tensile property with varying welding parameters. The change in the strength level with different welding parameters for
each alloy was not as significant as the variation in tensile elongation. It was believed that the tensile elongation of FSWed
Al alloys with varying welding parameters was mainly determined by the coarse particle clustering. With respect to the change
in tensile strength during friction stir welding, it is hypothesized that two competing mechanisms, recovery by friction and
heat and strain hardening by plastic flow in the weld zone offset the effects of different welding parameters on the tensile
strength level of FSWed Al alloys. |
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Keywords: | friction stir welding Al 6061-T651 Al 70750-T6 Al 5083-H32 mechanical property |
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