The experiments of laser fusion welding with Al-foil addition was carried out for DP590 dual-phase steel and AZ31B magnesium alloy in an overlap steel-on-magnesium configuration.Temperature field was simulated by COMS...The experiments of laser fusion welding with Al-foil addition was carried out for DP590 dual-phase steel and AZ31B magnesium alloy in an overlap steel-on-magnesium configuration.Temperature field was simulated by COMSOL finite element software for steel/magnesium laser fusion welding.The results show that when Al-foil is added,some defects,such as pores,cracks and softening in heat affected zone(HAZ),can be avoided in welding joint,the bonding strength of steel/magnesium joints is increased,heat transfer between steel and magnesium is regulated.In the case of adding Al-foil,welding pool is divided into two parts,the upper and lower pools contact each other but do not mix,the transition layer at the interface between the upper and lower molten pools mainly contains Al−Fe phases,such as AlFe,Al2Fe and AlFe3,and these new phases are helpful for promoting the metallurgical connection between the upper and lower molten pools.Hence,adding Al-foil laser fusion welding is an effective way in joining steel to magnesium alloy.展开更多
A unique Pd＆Cu@Al catalyst was easily fabricated just by immersing commercial aluminum foil in a mixed xylene solution of PdC12 and CuCl2. The catalyst fabrication process led to aluminum oxide coatings in situ, whic...A unique Pd＆Cu@Al catalyst was easily fabricated just by immersing commercial aluminum foil in a mixed xylene solution of PdC12 and CuCl2. The catalyst fabrication process led to aluminum oxide coatings in situ, which supported the metal nanoparticles and enhanced their catalytic activities for the phosphine-free Heck reaction of awl halides and styrenes with high turnover number （TON） up to 3.9×10^5. The reaction can be scaled up to at least 100 mmol and has been applied in modification of drug Lapatinib＇s intermediate with low metal residue. This novel catalyst is of good application potential in industrial production because it was extremely easy to be recycled, in regardless of the generation of the insoluble impurities or tars during the reaction processes.展开更多
基金Projects(51774125,51674112)supported by the National Natural Science Foundation of ChinaProject(2018YFB1107905)supported by the National Key Research and Development Program of China。
文摘The experiments of laser fusion welding with Al-foil addition was carried out for DP590 dual-phase steel and AZ31B magnesium alloy in an overlap steel-on-magnesium configuration.Temperature field was simulated by COMSOL finite element software for steel/magnesium laser fusion welding.The results show that when Al-foil is added,some defects,such as pores,cracks and softening in heat affected zone(HAZ),can be avoided in welding joint,the bonding strength of steel/magnesium joints is increased,heat transfer between steel and magnesium is regulated.In the case of adding Al-foil,welding pool is divided into two parts,the upper and lower pools contact each other but do not mix,the transition layer at the interface between the upper and lower molten pools mainly contains Al−Fe phases,such as AlFe,Al2Fe and AlFe3,and these new phases are helpful for promoting the metallurgical connection between the upper and lower molten pools.Hence,adding Al-foil laser fusion welding is an effective way in joining steel to magnesium alloy.
基金supported by the National Natural Science Foundation of China (21202141)Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions+3 种基金the Young Science and Technology Talent Support Project of Jiangsu Province (Lei Yu)the High Level Talent Support Project of Yangzhou University (Topnotch Talent, Lei Yu)the Open Project Program of Jiangsu Key Laboratory of Zoonosis (R1509)the Testing Centre of Yangzhou University
文摘A unique Pd＆Cu@Al catalyst was easily fabricated just by immersing commercial aluminum foil in a mixed xylene solution of PdC12 and CuCl2. The catalyst fabrication process led to aluminum oxide coatings in situ, which supported the metal nanoparticles and enhanced their catalytic activities for the phosphine-free Heck reaction of awl halides and styrenes with high turnover number （TON） up to 3.9×10^5. The reaction can be scaled up to at least 100 mmol and has been applied in modification of drug Lapatinib＇s intermediate with low metal residue. This novel catalyst is of good application potential in industrial production because it was extremely easy to be recycled, in regardless of the generation of the insoluble impurities or tars during the reaction processes.
