| In this work, a novel Al-Mg-Mn alloy and commercial 5083Al alloy were processed by rolling and equal channel angular pressing (ECAP), and the microstructural evolution during the subsequent annealing treatments were investigated. The mathematics model of the relationship between the microstructure characteristics and mechanical properties was set up. The cold rolled and warm rolled alloys exhibited static recovery after annealing at 200°C for 1h. While after annealing at 300°C for 1h, static recrystallization took place resulting in reasonably equiaxed grains, and simultaneously the strength decreased obviously. After annealing at 400°C and 500°C for 1h, the grain size grown gradually, and the strength decreased gradually. The microstructure and the strength is similar when annealing above 300°C.After annealing at 500°C for 2h, 4h, 8h and 24h respectively, the cold rolled and warm rolled alloys tended to be more equiaxed in form, but the grain size did not increase obviously, the reduce of the strength is also slight. When the annealing temperature was increased to 550°C, the grain size exhibited obvious growth, and the strength also decreased obviously.Compared to 5083 alloy, When after deforming, our alloy's strength and the stabilities is better than 5083 alloy. The alloy was processed by ECAP by four kinds of routes: A, C, BC, BA.The grain sizes obtained through the four routes exhibits only slight deviation, and all exhibited equiaxed grains. After annealing at 400°C for 1h, the grain size of Bc exhibited slight growth and strength is decreased . After annealing at 450°C for 1h, grain size exhibited obvious increase.The mathematics model of the relationship between the microstructure characteristics and mechanical properties was set up based on the Hall-Petch relationship.As the alloy is rolled and annealing at 200°C for 1h, the equation is: .As the alloy 15 annealing above 200°C, the equation is: For this equation, the strength measured and calculated is fit well. |
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