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- 저자 : Liwen Pan (검색결과 2 건)
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Microstructure and Tensile Properties of a Cast Eutectic Al–Si–Cu Alloy Modified by Zr and V
Jianbo Sun,Guangkai Zeng,Dewang Rao,Yuchen Wang,Yiwang Yang,Liwen Pan,Zhiliu Hu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Minor Zr and V were added individually and jointly to Al–12.5Si–1Cu alloy to develop heat-resistant aluminum alloys. Theas-cast microstructure, room temperature, and high temperature (350 °C) tensile properties and the strengthening mechanismof the modified alloys were investigated. The results show that the rod-like (Al, Si)3Zr and hexagonal (Si, Al)2V precipitatesare respectively found in the alloys with individually added Zr or V. At the same time, they were transformed into (Al,Si)3(Zr, V) and (Si, Al)2(V, Zr) when Zr and V were added together. Individually added Zr or V could change the eutecticsilicon aspect ratio, but the largest effect was recorded for the combined addition 0.3 wt% Zr + 0.4 wt% V. The addition ofZr and V had no significant impact on the room temperature tensile strength of the alloys but improved the yield strength. Individual additions of Zr and V caused negligible improvements in high-temperature tensile strength of alloys tested. Incontrast, the combined Zr + V additions resulted in the substantial improvement with tensile strength at 350 °C reaching79.4 MPa, i.e. 89% higher than the base alloy. The analysis shows that the increase of eutectic silicon aspect ratio and thesolution strengthening of trace V in eutectic silicon is the leading cause of improving high-temperature tensile strength. Thebrittle, blocky primary silicon, coarse rod-like (Al, Si)3(Zr, V), and hexagonal (Si, Al)2(V, Zr) precipitates are detrimentalto high-temperature properties.
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Ning, Fangkun,Wang, Chao,Berry, Karin Zemski,Kandasamy, Pitchaimani,Liu, Haolin,Murphy, Robert C.,Voelker, Dennis R.,Nho, Chu Won,Pan, Choel-Ho,Dai, Shaodong,Niu, Liwen,Chu, Hong-Wei,Zhang, Gongyi The Federation of American Societies for Experimen 2014 The FASEB Journal Vol.28 No.12
<P>The short palate, lung and nasal epithelial clone 1 (SPLUNC1) protein is a member of the palate, lung, and nasal epithelium clone (PLUNC) family, also known as bactericidal/permeability-increasing (BPI) fold-containing protein, family A, member 1 (BPIFA1). SPLUNC1 is an abundant protein in human airways, but its function remains poorly understood. The lipid ligands of SPLUNC1 as well as other PLUNC family members are largely unknown, although some reports provide evidence that lipopolysaccharide (LPS) could be a lipid ligand. Unlike previous hypotheses, we found significant structural differences between SPLUNC1 and BPI. Recombinant SPLUNC1 produced in HEK 293 cells harbored several molecular species of sphingomyelin and phosphatidylcholine as its ligands. Significantly, <I>in vitro</I> lipid-binding studies failed to demonstrate interactions between SPLUNC1 and LPS, lipoteichoic acid, or polymyxin B. Instead, one of the major and most important pulmonary surfactant phospholipids, dipalmitoylphosphatidylcholine (DPPC), bound to SPLUNC1 with high affinity and specificity. We found that SPLUNC1 could be the first protein receptor for DPPC. These discoveries provide insight into the specific determinants governing the interaction between SPLUNC1 and lipids and also shed light on novel functions that SPLUNC1 and other PLUNC family members perform in host defense.—Ning, F., Wang, C., Berry, K. Z., Kandasamy, P., Liu, H., Murphy, R. C., Voelker, D. R., Nho, C. W., Pan, C.-H., Dai, S., Niu, L., Chu, H.-W., Zhang, G. Structural characterization of the pulmonary innate immune protein SPLUNC1 and identification of lipid ligands.</P>
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