Optimizing the mechanical properties and damping capacity of the duplex-structured Mg–Li–Zn–Mn alloy by tailoring the microstructure via hot extrusion was investigated.The results show that the Mg–8Li–4Zn–1Mn al...Optimizing the mechanical properties and damping capacity of the duplex-structured Mg–Li–Zn–Mn alloy by tailoring the microstructure via hot extrusion was investigated.The results show that the Mg–8Li–4Zn–1Mn alloy is mainly composed ofα-Mg,β-Li,Mg–Li–Zn and Mn phases.The microstructure of the test alloy is refined owing to dynamic recrystallization(DRX)during hot extrusion.After hot extrusion,the crushed precipitates are uniformly distributed in the test alloy.The yield strength(YS),ultimate tensile strength(UTS),and elongation(EL)of as-extruded alloy reach 156 MPa,208 MPa,and 32.3%,respectively,which are much better than that of as-cast alloy.Furthermore,the as-extruded and as-cast alloys both exhibit superior damping capacities,with the damping capacity(Q^(-1))of 0.030 and 0.033 at the strain amplitude of 2×10^(-3),respectively.The mechanical properties of the test alloy can be significantly improved by hot extrusion,whereas the damping capacities have no noticeable change,which indicates that the duplex-structured Mg–Li alloys with appropriate mechanical properties and damping properties can be obtained by alloying and hot extrusion.展开更多
To accurately guide surgical instruments during ophthalmic procedures,some necessary intraoperative depth perception is required,which standard surgical microscopes supply limit-edly.Intraoperative optical coherence t...To accurately guide surgical instruments during ophthalmic procedures,some necessary intraoperative depth perception is required,which standard surgical microscopes supply limit-edly.Intraoperative optical coherence tomography(iOCT),combining optical coherence to-mography(OCT)technology and surgical microscope,enables noninvasive,real-time and high-resolution cross-sectional imaging.Currently,though iOCT enables structural imaging,little research has been done on intraoperative angiography.In this work,we presented a swept-source intraoperative OCT angiography(SS-iOCTA)system based on a standard surgical microscope,which provides both structural and angiographic images.The feasibility of the proposed SS-iOCTA was confirmed through deep anterior lamellar keratoplasty(DALK)of ex vivo porcine eyes and blood perfusion imaging of in vivo rat cortex.High-resolution intraoperative feedback,including sub-surface structure and angiogram of biological tissue,can be visualized simulta-neously with the SS-iOCTA system,which expand the surgeon's capabilities and could be widely used in clinical surgery.展开更多
基金financially supported by the National Key Research and Development Program of China(No.2021YFB 3701100)the National Natural Science Foundation of China(Nos.52171104 and U20A20234)+2 种基金the Chongqing Research Program of Basic Research and Frontier Technology,China(Nos.cstc2021ycjh-bgzxm0086 and 2019jcyj-msxmX0306)the Fundamental Research Funds for Central Universities,China(Nos.SKLMT-ZZKT-2022R04,2021CDJJMRH-001,and SKLMT-ZZKT-2022M12)the 111 Project by the Ministry of Education and the State Administration of Foreign Experts Affairs of China(No.B16007)。
文摘Optimizing the mechanical properties and damping capacity of the duplex-structured Mg–Li–Zn–Mn alloy by tailoring the microstructure via hot extrusion was investigated.The results show that the Mg–8Li–4Zn–1Mn alloy is mainly composed ofα-Mg,β-Li,Mg–Li–Zn and Mn phases.The microstructure of the test alloy is refined owing to dynamic recrystallization(DRX)during hot extrusion.After hot extrusion,the crushed precipitates are uniformly distributed in the test alloy.The yield strength(YS),ultimate tensile strength(UTS),and elongation(EL)of as-extruded alloy reach 156 MPa,208 MPa,and 32.3%,respectively,which are much better than that of as-cast alloy.Furthermore,the as-extruded and as-cast alloys both exhibit superior damping capacities,with the damping capacity(Q^(-1))of 0.030 and 0.033 at the strain amplitude of 2×10^(-3),respectively.The mechanical properties of the test alloy can be significantly improved by hot extrusion,whereas the damping capacities have no noticeable change,which indicates that the duplex-structured Mg–Li alloys with appropriate mechanical properties and damping properties can be obtained by alloying and hot extrusion.
基金National Natural Science Foundation of China(62075189 and 81873911)Zhejiang Provincial Natural Science Foundation of China(LR19F050002)+1 种基金Zhejiang Lab(2018EBOZX01)Fundamental Research Funds for the Central Universities(2018FZA5003).
文摘To accurately guide surgical instruments during ophthalmic procedures,some necessary intraoperative depth perception is required,which standard surgical microscopes supply limit-edly.Intraoperative optical coherence tomography(iOCT),combining optical coherence to-mography(OCT)technology and surgical microscope,enables noninvasive,real-time and high-resolution cross-sectional imaging.Currently,though iOCT enables structural imaging,little research has been done on intraoperative angiography.In this work,we presented a swept-source intraoperative OCT angiography(SS-iOCTA)system based on a standard surgical microscope,which provides both structural and angiographic images.The feasibility of the proposed SS-iOCTA was confirmed through deep anterior lamellar keratoplasty(DALK)of ex vivo porcine eyes and blood perfusion imaging of in vivo rat cortex.High-resolution intraoperative feedback,including sub-surface structure and angiogram of biological tissue,can be visualized simulta-neously with the SS-iOCTA system,which expand the surgeon's capabilities and could be widely used in clinical surgery.