We investigated the effects of Al concentration on the reciprocated motion of twin boundaries in pre-strained Mg-Al-Zn alloys through a combination of applied compression and tension,in-situ electron-backscattering di...We investigated the effects of Al concentration on the reciprocated motion of twin boundaries in pre-strained Mg-Al-Zn alloys through a combination of applied compression and tension,in-situ electron-backscattering diffraction observations,and high-angle annular dark-field scanning transmission electron microscopy observations.The twin growth was restricted by increased Al concentration,which resulted in the occurrence of smaller-sized twins.The reverse motion of twin boundaries was also restricted,resulting in the formation of higher fractions of secondary twins and 2–5°boundaries during reverse tension.The secondary twins and 2–5°boundaries mainly contributed to the increased ultimate tensile strength of the pre-strained Mg alloys.This effect is more significant in Mg alloys with larger pre-compression.Moreover,the increased amount of the Al solute atoms,rather than the precipitates,mainly contributed to the increased strengthening effect on the twin boundary motion.Our research contributes to development of high-strength Mg alloys by stabilizing twin boundaries.展开更多
Engineering the nanoscale domain structure of transition metal catalysts offers a promising pathway to enhance their intrinsic activity by tailoring surface coordination and electronic states.Here,we report a MgO-assi...Engineering the nanoscale domain structure of transition metal catalysts offers a promising pathway to enhance their intrinsic activity by tailoring surface coordination and electronic states.Here,we report a MgO-assisted solvothermal strategy for synthesizing hexagonal close-packed(HCP)Ru nanospheres from Ru(acac)_(3)in isopropanol,in which MgO templates modulate the crystallization pathway to preferentially expose the(100)and(002)facets while suppressing the(101)facet.展开更多
Difficult-to-deform titanium alloys are commonly processed by hot spinning instead of room-temperature spinning due to their hexagonal close-packed structure with limited slip system.Here,this work successfully spun a...Difficult-to-deform titanium alloys are commonly processed by hot spinning instead of room-temperature spinning due to their hexagonal close-packed structure with limited slip system.Here,this work successfully spun a new high-strength titanium alloy at room temperature,exploring its spinnability and superior strength–ductility synergy.展开更多
基金funded by Japan Society for the Promotion of Science(grant no.18K14024)。
文摘We investigated the effects of Al concentration on the reciprocated motion of twin boundaries in pre-strained Mg-Al-Zn alloys through a combination of applied compression and tension,in-situ electron-backscattering diffraction observations,and high-angle annular dark-field scanning transmission electron microscopy observations.The twin growth was restricted by increased Al concentration,which resulted in the occurrence of smaller-sized twins.The reverse motion of twin boundaries was also restricted,resulting in the formation of higher fractions of secondary twins and 2–5°boundaries during reverse tension.The secondary twins and 2–5°boundaries mainly contributed to the increased ultimate tensile strength of the pre-strained Mg alloys.This effect is more significant in Mg alloys with larger pre-compression.Moreover,the increased amount of the Al solute atoms,rather than the precipitates,mainly contributed to the increased strengthening effect on the twin boundary motion.Our research contributes to development of high-strength Mg alloys by stabilizing twin boundaries.
文摘Engineering the nanoscale domain structure of transition metal catalysts offers a promising pathway to enhance their intrinsic activity by tailoring surface coordination and electronic states.Here,we report a MgO-assisted solvothermal strategy for synthesizing hexagonal close-packed(HCP)Ru nanospheres from Ru(acac)_(3)in isopropanol,in which MgO templates modulate the crystallization pathway to preferentially expose the(100)and(002)facets while suppressing the(101)facet.
基金financially supported by the National Key R&D Program of China(No.2021YFC2801900)the National Natural Science Foundation of China(Nos.52371138,52175348,52192592,52401193,52301195,and 52471160)+2 种基金Shanghai Space Advanced Technology Joint Research Fund(No.USCAST2023-1)China National Nuclear Group Led the Creation of Scientific Research Projects(No.CNNC-LCKY-202233)Chinese Aeronautical Establishment Aeronautical Science Fund(Nos.2023Z055057005 and 2024M055057001)
文摘Difficult-to-deform titanium alloys are commonly processed by hot spinning instead of room-temperature spinning due to their hexagonal close-packed structure with limited slip system.Here,this work successfully spun a new high-strength titanium alloy at room temperature,exploring its spinnability and superior strength–ductility synergy.
