This work presents the modified precipitation behavior of the β phase in a Mg-8.0Al-0.5Zn-0.2Mn-0.4Ce alloy(wt%,designated as AZ80+0.4%Ce),which has been subjected to room-temperature pre-compression and a subsequent...This work presents the modified precipitation behavior of the β phase in a Mg-8.0Al-0.5Zn-0.2Mn-0.4Ce alloy(wt%,designated as AZ80+0.4%Ce),which has been subjected to room-temperature pre-compression and a subsequent dual-stage aging treatment,thereby imparting it with the pronounced basal texture.It was found that the synergistic application of pre-compression and dual-stage aging protocol markedly accelerates the age-hardening response and architecture of the continuous precipitates(CPs)in the present AZ80+0.4%Ce alloy.Consequently,this alloy achieves an exceptional balance between strength and ductility,boasting a yield strength of approximately 229.0 MPa alongside an elongation of around 7.0%.A series of microstructural characterizations reveal that high-density intragranular dislocations introduced by pre-compression serve as catalysts for the preferential formation of CPs over the discontinuous precipitates,effectively suppressing the latter.Notably,this also facilitates static recrystallization,which refines the grain structure and alleviates the residual stresses induced by deformation,further enhancing the mechanical properties.This research contributes a novel perspective to the thermomechanical processing design of precipitation-hardened lightweight alloys,offering a pathway to optimize their performance through tailored thermomechanical strategies.展开更多
The hot deformation behavior of extruded AZ80 magnesium alloy was studied through hot compression tests performed at temperatures ranging from 250 to 450 ~C with strain rates varying from 0.001 to 10 s-1. The flow str...The hot deformation behavior of extruded AZ80 magnesium alloy was studied through hot compression tests performed at temperatures ranging from 250 to 450 ~C with strain rates varying from 0.001 to 10 s-1. The flow stress was corrected due to the deformation heating. The Zener-Hollomon parameter （Z parameter） and processing map were established to describe the hot deformation behavior. The results indicate that the applicable deformation should be conducted at the strain rate of 0.1 s-~ and the temperature range of 350-400 ~C. Besides, the relationship between the microstructure evolution and Z parameter was also discussed. High temperature and low strain rate result in a low Z parameter, which leads to full dynamic recrystallization （DRX） and large DRX grain size in the microstructure. Considering processing map and microstructure, the hot deformation should be carried out at the temperature of 400 ~C and the strain rate of 0.1 s 1.展开更多
基金supported by the Innovative Talents Support Program of Higher Education Institutions in Shanxi Province and the North University of China Project of Science and Technology in 2022(20221878).
文摘This work presents the modified precipitation behavior of the β phase in a Mg-8.0Al-0.5Zn-0.2Mn-0.4Ce alloy(wt%,designated as AZ80+0.4%Ce),which has been subjected to room-temperature pre-compression and a subsequent dual-stage aging treatment,thereby imparting it with the pronounced basal texture.It was found that the synergistic application of pre-compression and dual-stage aging protocol markedly accelerates the age-hardening response and architecture of the continuous precipitates(CPs)in the present AZ80+0.4%Ce alloy.Consequently,this alloy achieves an exceptional balance between strength and ductility,boasting a yield strength of approximately 229.0 MPa alongside an elongation of around 7.0%.A series of microstructural characterizations reveal that high-density intragranular dislocations introduced by pre-compression serve as catalysts for the preferential formation of CPs over the discontinuous precipitates,effectively suppressing the latter.Notably,this also facilitates static recrystallization,which refines the grain structure and alleviates the residual stresses induced by deformation,further enhancing the mechanical properties.This research contributes a novel perspective to the thermomechanical processing design of precipitation-hardened lightweight alloys,offering a pathway to optimize their performance through tailored thermomechanical strategies.
文摘The hot deformation behavior of extruded AZ80 magnesium alloy was studied through hot compression tests performed at temperatures ranging from 250 to 450 ~C with strain rates varying from 0.001 to 10 s-1. The flow stress was corrected due to the deformation heating. The Zener-Hollomon parameter （Z parameter） and processing map were established to describe the hot deformation behavior. The results indicate that the applicable deformation should be conducted at the strain rate of 0.1 s-~ and the temperature range of 350-400 ~C. Besides, the relationship between the microstructure evolution and Z parameter was also discussed. High temperature and low strain rate result in a low Z parameter, which leads to full dynamic recrystallization （DRX） and large DRX grain size in the microstructure. Considering processing map and microstructure, the hot deformation should be carried out at the temperature of 400 ~C and the strain rate of 0.1 s 1.
