This study proposed an effective plastic deformation technique,rotating backward extrusion(RBE),for producing high performance AZ80 magnesium alloy cup-shaped pieces.The RBE process was carried on the Gleeble-3500 tes...This study proposed an effective plastic deformation technique,rotating backward extrusion(RBE),for producing high performance AZ80 magnesium alloy cup-shaped pieces.The RBE process was carried on the Gleeble-3500 test machine at 653 K,and the conventional backward extrusion(CBE)was also conducted for comparison.A detailed microstructure analysis was performed using the optical microscopy(OM)and electron back-scatter diffraction(EBSD).The results shown that the equivalent strain and deformation uniformity of the cup pieces could be substantially increased by the RBE process compared with the CBE process.Furthermore,the RBE process could significantly improve the grain refining capacity and the proportion of dynamic recrystallization(DRX),of which the maximum reduction of grain size was 88.60%,and the maximum increase of DRX proportion was 55.30%in the cup bottom.The main deformation mechanism of the RBE process was the discontinuous DRX(DDRX),while the continuous DRX(CDRX)was also occurred in the cup transition.Compared with the CBE sample,the texture of the cup bottom was weakened for the RBE sample.The microhardness value of the RBE sample was higher than that of the CBE sample,which can be attributed to the grain refinement strengthening.展开更多
Welding with trailing rotating extrusion is a new method designed to improve the welding quality of aluminum alloy thin-plate weldments. The effect of this technology on fatigue strength of aluminum alloy welded joint...Welding with trailing rotating extrusion is a new method designed to improve the welding quality of aluminum alloy thin-plate weldments. The effect of this technology on fatigue strength of aluminum alloy welded joints was investigated and analyzed in this paper. Experimental data show that welding with trailing rotating extrusion can improve the fatigue strength of aluminum alloy weldments remarkably,展开更多
基金financially supported by the National Natural Science Foundation of China(No.51775520)the National Key Research and Development Program(No.2016YFB0301103-3)+1 种基金the Key R&D program of Shanxi Province(International Cooperation)(No.201903D421036)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2018002)。
文摘This study proposed an effective plastic deformation technique,rotating backward extrusion(RBE),for producing high performance AZ80 magnesium alloy cup-shaped pieces.The RBE process was carried on the Gleeble-3500 test machine at 653 K,and the conventional backward extrusion(CBE)was also conducted for comparison.A detailed microstructure analysis was performed using the optical microscopy(OM)and electron back-scatter diffraction(EBSD).The results shown that the equivalent strain and deformation uniformity of the cup pieces could be substantially increased by the RBE process compared with the CBE process.Furthermore,the RBE process could significantly improve the grain refining capacity and the proportion of dynamic recrystallization(DRX),of which the maximum reduction of grain size was 88.60%,and the maximum increase of DRX proportion was 55.30%in the cup bottom.The main deformation mechanism of the RBE process was the discontinuous DRX(DDRX),while the continuous DRX(CDRX)was also occurred in the cup transition.Compared with the CBE sample,the texture of the cup bottom was weakened for the RBE sample.The microhardness value of the RBE sample was higher than that of the CBE sample,which can be attributed to the grain refinement strengthening.
文摘Welding with trailing rotating extrusion is a new method designed to improve the welding quality of aluminum alloy thin-plate weldments. The effect of this technology on fatigue strength of aluminum alloy welded joints was investigated and analyzed in this paper. Experimental data show that welding with trailing rotating extrusion can improve the fatigue strength of aluminum alloy weldments remarkably,