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戴晓元,熊超宇,李妮,罗奕兵.TTT and TTP diagrams for quench sensitivity of Al-9.0Zn-2.5Mg-1.5Cu-0.15Zr-0.2Sc alloy[J].稀有金属材料与工程(英文),2019,48(3):721~727.[Dai Xiaoyuan,Xiong Chaoyu,Li Ni and Luo Yibing.TTT and TTP diagrams for quench sensitivity of Al-9.0Zn-2.5Mg-1.5Cu-0.15Zr-0.2Sc alloy[J].Rare Metal Materials and Engineering,2019,48(3):721~727.]
TTT and TTP diagrams for quench sensitivity of Al-9.0Zn-2.5Mg-1.5Cu-0.15Zr-0.2Sc alloy
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Received:October 10, 2017  Revised:January 08, 2018
DOI:
Key words: Al-9.0Zn-2.5Mg-1.5Cu-0.15Zr-0.2Sc alloy  TTT curve  TTP curve  PFZ
Foundation item:长沙理工大学工程车辆轻量化与可靠性技术湖南省高校重点实验室开放基金
Author NameAffiliation
Dai Xiaoyuan,Xiong Chaoyu,Li Ni and Luo Yibing  
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Abstract:
      The time-temperature-transformation (TTT) curve and time-temperature-property (TTP) curve of Al-9.0Zn-2.5Mg-1.5Cu-0.15Zr-0.2Sc alloy were determined by interrupted quenching technique. Phase transformations have been investigated by TEM, DSC and XRD. The result shows that under certain temperature and prolonging the holding time, the electro-conductivity of the specimens tend to increase and the hardness will decreases. Microstructure observation indicates that with the time increased, a lot of large equilibrium rod-shaped η (MgZn2)phase precipitated in the matrix and grew rapidly, which results in loss of solutes in the aging process and weakened the strengthening effect. The main reasons for precipitation of η particles are that the rapid diffusion of solute atoms and the strong driving force for phase transformation. Quench sensitive temperature range is 270℃~390℃. Consequently, the cooling rate should?be consider?lowering appropriately from the solution temperature to 390℃ to control the residual stress. And then, in the quench sensitive range, it is necessary to increase the cooling rate properly to obtain high mechanical properties.