The MCrAlY coating has been potential candidate for the parts applied in friction and corrosion conditions, and CNTs (carbon nanotubes) are expected to improve the service performance of coatings owing to high lubrica...The MCrAlY coating has been potential candidate for the parts applied in friction and corrosion conditions, and CNTs (carbon nanotubes) are expected to improve the service performance of coatings owing to high lubrication and low chemical reactivity. In this work, a systematic investigation on the tribological and corrosion properties of CoCrAlYTaSiC-xCNTs coatings deposited by laser melting was analyzed. Results showed that the coatings had good-quality without typical metallurgical defects. The CNTs addition homogenized and refined the microstructure of coating, and also improved the tribological and corrosion properties. As the CNTs content changed from 0 to 4 wt%, the wear rate of coating decreased from 16.23 × 10^(-3) to 7.58 × 10^(-3) mg m^(−1), the jcorr of coating decreased from 4.13 × 10^(-4) to 1.23 × 10^(-4) A cm^(−2), and the Rct values increased from 12.69 to 25.07 Ω cm2.展开更多
The inverse relationship between the saturation magnetic flux density(Bs)and coercivity(Hc)of Febased amorphous alloys is a very active research topic that has been extensively debated.In this work,we conducted a deta...The inverse relationship between the saturation magnetic flux density(Bs)and coercivity(Hc)of Febased amorphous alloys is a very active research topic that has been extensively debated.In this work,we conducted a detailed investigation on the magnetic softness of Fe_(83.2-x)Co_(x)B_(10)C_(6)Cu_(0.8)(x=0 and 6 at.%)amorphous alloys based on analysis of the surface morphology,microstructure,magnetic anisotropy,and magnetic domain structure.Enhanced magnetic softness-magnetization synergy was realized in the present alloys by magnetic field annealing(MFA)during the de-stressing process.A dramatic 84%reduction of Hc to 2.2 A/m was achieved for the Co-doped alloy under MFA,exhibiting excellent magnetic performance with a superb Bs of 1.86 T.The consistency between the experimental results and theoretical analysis revealed that the MFA process can mitigate the trade-off between stress-induced anisotropy and induced uniaxial anisotropy owing to the homogenized structure formed by field annealing.Thus,the process favored a low Hc due to the significant continuous decline in the total magnetic anisotropy,which coincided well with the results of Magneto-optical Kerr microscopy.The study elucidates a mechanism for tuning Hc in Co-doped alloy systems and affords a possible pathway for softening amorphous alloys with high Bs.展开更多
Acute myeloid leukaemia(AML)is characterized mainly by an increase in the number of myeloid cells in the bone marrow and a decrease in the number of mature cells;AML accounts for 28%of leukaemia cases,and it has a fiv...Acute myeloid leukaemia(AML)is characterized mainly by an increase in the number of myeloid cells in the bone marrow and a decrease in the number of mature cells;AML accounts for 28%of leukaemia cases,and it has a five-year survival rate of only30.5%[1].The prognosis of AML patients is mostly poor,and drug resistance eventually emerges with the long-term use of chemotherapy or targeted therapy;this drug resistance represents a daunting challenge in the management of AML[2,3].展开更多
文摘The MCrAlY coating has been potential candidate for the parts applied in friction and corrosion conditions, and CNTs (carbon nanotubes) are expected to improve the service performance of coatings owing to high lubrication and low chemical reactivity. In this work, a systematic investigation on the tribological and corrosion properties of CoCrAlYTaSiC-xCNTs coatings deposited by laser melting was analyzed. Results showed that the coatings had good-quality without typical metallurgical defects. The CNTs addition homogenized and refined the microstructure of coating, and also improved the tribological and corrosion properties. As the CNTs content changed from 0 to 4 wt%, the wear rate of coating decreased from 16.23 × 10^(-3) to 7.58 × 10^(-3) mg m^(−1), the jcorr of coating decreased from 4.13 × 10^(-4) to 1.23 × 10^(-4) A cm^(−2), and the Rct values increased from 12.69 to 25.07 Ω cm2.
基金supported by the Anhui Provincial Natural Science Foundation(No.2208085QE121)the Key Research&Development plan of Anhui Province(No.2022a05020016)+2 种基金the University Natural Science Research Project of Anhui Province(No.2023AH051084)the National Natural Science Foundation of China(No.52071078)the“Zhishan”Scholars Programs of Southeast University(No.2242021R41158).
文摘The inverse relationship between the saturation magnetic flux density(Bs)and coercivity(Hc)of Febased amorphous alloys is a very active research topic that has been extensively debated.In this work,we conducted a detailed investigation on the magnetic softness of Fe_(83.2-x)Co_(x)B_(10)C_(6)Cu_(0.8)(x=0 and 6 at.%)amorphous alloys based on analysis of the surface morphology,microstructure,magnetic anisotropy,and magnetic domain structure.Enhanced magnetic softness-magnetization synergy was realized in the present alloys by magnetic field annealing(MFA)during the de-stressing process.A dramatic 84%reduction of Hc to 2.2 A/m was achieved for the Co-doped alloy under MFA,exhibiting excellent magnetic performance with a superb Bs of 1.86 T.The consistency between the experimental results and theoretical analysis revealed that the MFA process can mitigate the trade-off between stress-induced anisotropy and induced uniaxial anisotropy owing to the homogenized structure formed by field annealing.Thus,the process favored a low Hc due to the significant continuous decline in the total magnetic anisotropy,which coincided well with the results of Magneto-optical Kerr microscopy.The study elucidates a mechanism for tuning Hc in Co-doped alloy systems and affords a possible pathway for softening amorphous alloys with high Bs.
基金supported by the National Natural Science Foundation of China(81673466,81821005,32322048,22225702,92153302,32471497,82404655,and 82273951)Guangdong High-level New R&D Institute(2019B090904008)+8 种基金Guangdong High-level Innovative Research Institute(2021B0909050003)Science and Technology Commission of Shanghai Municipality(18431907100 and 19430750100)the National Key Research and Development Program of China(2020YFE0202200)Program of Shanghai Academic Research Leader(2XD1420900)Shanghai Rising-Star Program(22QA1411100)the Youth Innovation Promotion Association(CAS2021276)the support of the Sanofi scholarship program,Shandong Laboratory Program(SYS202205)Taishan Scholars Program(tstp0648)Innovative Research Team of High-level Local Universities in Shanghai,and Shanghai Science and Technology Development Funds(24YF2755300)。
文摘Acute myeloid leukaemia(AML)is characterized mainly by an increase in the number of myeloid cells in the bone marrow and a decrease in the number of mature cells;AML accounts for 28%of leukaemia cases,and it has a five-year survival rate of only30.5%[1].The prognosis of AML patients is mostly poor,and drug resistance eventually emerges with the long-term use of chemotherapy or targeted therapy;this drug resistance represents a daunting challenge in the management of AML[2,3].
