The extrusion preform of the spray-formed5A12Al alloy was hot rolled using high reduction rolling technology.By means of transmission electron microscopy(TEM),electron backscatter diffraction(EBSD)and energy dispersiv...The extrusion preform of the spray-formed5A12Al alloy was hot rolled using high reduction rolling technology.By means of transmission electron microscopy(TEM),electron backscatter diffraction(EBSD)and energy dispersive spectroscopy(EDS),the microstructure evolution was studied and the strengthening and toughening mechanism was thereby proposed.The results indicate that discontinuous and continuous dynamic recrystallization occurred during the hot rolling deformation of the spray-formed5A12Al alloy.The grain size was significantly refined and the micro-scale grains formed.Partial dynamic recrystallization leads to a significant increase of dislocation density and cellular structure.The Mg atoms were distributed in the Al matrix mainly in the presence of solid solution rather than the formation of precipitate.High solid solution of Mg atoms not only hindered the dislocation motion and increased the density of dislocation,but also exhibited a remarkable solid solution strengthening effect,which contributes to the high strength and high toughness of the as-rolled sheets.The tensile strength and elongation of spray formed5A12Al alloy at room temperature after3passes hot rolling were622MPa and20%,respectively.展开更多
酷炫的机箱LED灯光效果曾经只有靠MOD来实现，是少数狂热玩家炫耀的资本，如今只需要选对机箱，就可以轻松获得引人注目的效果。在机箱的外观设计方面，金翔再次给了我们一个惊喜，还有什么比显示在机箱前面板上的蓝色“World Best Des...酷炫的机箱LED灯光效果曾经只有靠MOD来实现，是少数狂热玩家炫耀的资本，如今只需要选对机箱，就可以轻松获得引人注目的效果。在机箱的外观设计方面，金翔再次给了我们一个惊喜，还有什么比显示在机箱前面板上的蓝色“World Best Design＆Quality”更酷的呢？展开更多
The dynamic process of welding angular distortion in the overlaying welding of 5A12 aluminum alloy and BT20 titanium alloy was investigated.Information of dynamic distortion was got via self-made welding dynamic measu...The dynamic process of welding angular distortion in the overlaying welding of 5A12 aluminum alloy and BT20 titanium alloy was investigated.Information of dynamic distortion was got via self-made welding dynamic measuring system.Research results show that the characteristics of dynamic distortions at various positions of the plate edge parallel to the weld of 5A12 and BT20 alloy are different.Comparison between 5A12 and BT20 alloy shows that transverse shrinkage and downward longitudinal bending are main factors influencing the dynamic angular distortion processes of 5A12 and BT20 alloy under welding heat input of 0.32 kJ/mm.The angular distortion of 5A12 alloy is completely inversed with welding heat input increasing to 0.4 kJ/mm,and the position of weld center and buckling distortion become the primary factors.展开更多
基金the State Key Lab of Advanced Welding Production Technologythe China Doctoral Education Base Foundation (20030698018)National Nature Science Foundation of China (50475093)
基金Project(2017JJ2073) supported by the Natural Science Foundation of Hunan Province,ChinaProject(15B063) supported by the Youth Research Foundation of Education Bureau of Hunan Province,China
文摘The extrusion preform of the spray-formed5A12Al alloy was hot rolled using high reduction rolling technology.By means of transmission electron microscopy(TEM),electron backscatter diffraction(EBSD)and energy dispersive spectroscopy(EDS),the microstructure evolution was studied and the strengthening and toughening mechanism was thereby proposed.The results indicate that discontinuous and continuous dynamic recrystallization occurred during the hot rolling deformation of the spray-formed5A12Al alloy.The grain size was significantly refined and the micro-scale grains formed.Partial dynamic recrystallization leads to a significant increase of dislocation density and cellular structure.The Mg atoms were distributed in the Al matrix mainly in the presence of solid solution rather than the formation of precipitate.High solid solution of Mg atoms not only hindered the dislocation motion and increased the density of dislocation,but also exhibited a remarkable solid solution strengthening effect,which contributes to the high strength and high toughness of the as-rolled sheets.The tensile strength and elongation of spray formed5A12Al alloy at room temperature after3passes hot rolling were622MPa and20%,respectively.
基金Project(50475093)supported by the National Natural Science Foundation of ChinaProject supported by the State Key Laboratory ofAdvanced Welding Production Technology,China
文摘The dynamic process of welding angular distortion in the overlaying welding of 5A12 aluminum alloy and BT20 titanium alloy was investigated.Information of dynamic distortion was got via self-made welding dynamic measuring system.Research results show that the characteristics of dynamic distortions at various positions of the plate edge parallel to the weld of 5A12 and BT20 alloy are different.Comparison between 5A12 and BT20 alloy shows that transverse shrinkage and downward longitudinal bending are main factors influencing the dynamic angular distortion processes of 5A12 and BT20 alloy under welding heat input of 0.32 kJ/mm.The angular distortion of 5A12 alloy is completely inversed with welding heat input increasing to 0.4 kJ/mm,and the position of weld center and buckling distortion become the primary factors.
