The mechanical properties of Ti-23Al-17Nb (mole fraction,%) laser beam welding alloy joint at room temperature are comparable to that of the base materials.However,the strength and ductility of the as-welded joint det...The mechanical properties of Ti-23Al-17Nb (mole fraction,%) laser beam welding alloy joint at room temperature are comparable to that of the base materials.However,the strength and ductility of the as-welded joint deteriorate seriously after high temperature circulation.The effect of post-welded heat treatment on the microstructure and mechanical properties of the joint was investigated.The heat treatment was taken at 980 ℃ for 1.5 h,then furnace cooling and air cooling were performed separately.The results indicate that proper post-welded heat treatment improves the ductility of the joint at high temperature.展开更多
Two-proton relative momentum distributions from the break-up channels 23Al→p+p+21Na and 22Mg→p+p+20Ne at an energy of 60-70 A MeV have been measured together with two-proton opening angles at the projectile fragment...Two-proton relative momentum distributions from the break-up channels 23Al→p+p+21Na and 22Mg→p+p+20Ne at an energy of 60-70 A MeV have been measured together with two-proton opening angles at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility. The results demonstrate the existence of diproton emission component from single-step 2He for highly excited 23Al and 22Mg.展开更多
Microstructure and tensile properties of Ti-23Al-17Nb （at%） alloy sheets rolled in （a2 ＋ B2 ＋ O） phase field with the various heat treatments were studied. Before rolling the microstructure of the billet is B2 p...Microstructure and tensile properties of Ti-23Al-17Nb （at%） alloy sheets rolled in （a2 ＋ B2 ＋ O） phase field with the various heat treatments were studied. Before rolling the microstructure of the billet is B2 phase particles embedded in O phase continuity matrix. The B2 phases are deformed more greatly than a2/O phases during the same rolling step. The （a2 ＋B2） two phase equiaxed microstrueture can be obtained by solution treatment in （a2 ＋ B2） phase field. The B2 phases become the continuous matrix by recrystallization and growing up of B2 and thus anisotropy caused by rolling can be decreased. The microstructure obtained by solution treatment has better tensile properties than the microstructure gained by subsequent aging treatment in （O＋ B2） phase field because the O phases precipitate as the block structure during aging and results in the B2 matrix continuity being broken down.展开更多
文摘The mechanical properties of Ti-23Al-17Nb (mole fraction,%) laser beam welding alloy joint at room temperature are comparable to that of the base materials.However,the strength and ductility of the as-welded joint deteriorate seriously after high temperature circulation.The effect of post-welded heat treatment on the microstructure and mechanical properties of the joint was investigated.The heat treatment was taken at 980 ℃ for 1.5 h,then furnace cooling and air cooling were performed separately.The results indicate that proper post-welded heat treatment improves the ductility of the joint at high temperature.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10775167, 10775168, 10979074, 10405032, 10747163, 10805067 and 10605036)the Major State Basic Research Development Program of China (Grant No. 2007CB815004)the Shanghai Development Foundation for Science and Technology (Grant No. 09JC1416800)
文摘Two-proton relative momentum distributions from the break-up channels 23Al→p+p+21Na and 22Mg→p+p+20Ne at an energy of 60-70 A MeV have been measured together with two-proton opening angles at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility. The results demonstrate the existence of diproton emission component from single-step 2He for highly excited 23Al and 22Mg.
文摘Microstructure and tensile properties of Ti-23Al-17Nb （at%） alloy sheets rolled in （a2 ＋ B2 ＋ O） phase field with the various heat treatments were studied. Before rolling the microstructure of the billet is B2 phase particles embedded in O phase continuity matrix. The B2 phases are deformed more greatly than a2/O phases during the same rolling step. The （a2 ＋B2） two phase equiaxed microstrueture can be obtained by solution treatment in （a2 ＋ B2） phase field. The B2 phases become the continuous matrix by recrystallization and growing up of B2 and thus anisotropy caused by rolling can be decreased. The microstructure obtained by solution treatment has better tensile properties than the microstructure gained by subsequent aging treatment in （O＋ B2） phase field because the O phases precipitate as the block structure during aging and results in the B2 matrix continuity being broken down.
