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Strengthening mechanism of ultra-fine sub-grained Al alloy |
1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract Equal-channel angular pressing (ECAP) of the 2024 Al alloy treated by overaging treatment was performed at room temperature with an imposed equivalent strain of 0.5. The hardness of 100 HV, yield strength of 130 MPa and elongation rate of 31% aluminum alloys were obtained for the ECAPed alloy. The strengthening mechanism was analysed. The results show that the yield strength of measured and calculated values agree very well. It is proved that the yield strength of 2024 aluminum alloy by overaging solution after ECAP processing depends primarily on the matrix yield strength, which mainly includes dislocation strengthening, subgrain boundary strengthening, grain boundary strengthening and lattice friction stress.
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