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《Special Casting & Nonferrous Alloys》 2018-09
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Microstructure Evolution and Model of 2D70 Aluminum Alloy during Hot Deformation

Qi Yongjie;LüHangying;Yu Xinping;Pan Guangyong;Information and Control Engineering Institute,Zhejiang Guangsha College of Applied Construction Technology;  
Stress-strain curves and microstructure evolution of 2D70aluminum alloy were analyzed by isothermal constant strain rate compression deformation test at 350~530℃and strain rate of 0.001~1s~(-1).The flow stress equation and dislocation density model of 2D70aluminum alloy were established under the given conditions.And DEFORM-3Dfinite element software was used to simulate the microstructure of the alloy.The results show that the dynamic recrystallization of 2D70aluminum alloy at 350℃can result in the more refinement of alloy grains under a lower strain rate(0.001s~(-1)).The S-Al_2CuMg phase is decreased greatly to be dissolved into the matrix and theα-Al phase grains is decreased gradually with increasing in strain rate when the deformation temperature reaches 470℃.The size ofα-Al phase is decreased with increasing in strain rate.Theα-Al phase grains are coarsened with deformed at a lower strain rate(0.001s~(-1)).Simulation comparison reveals that the grains in the simulated microstructure are well in agreement with the evolution of metallographic microstructure.
【Fund】: 航空科学基金资助项目(2015ZE56011)
【CateGory Index】: TG146.21;TP311
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