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Microstructure and Mechanical Properties of TA15 Alloy Produced by Electron Beam Melting
Jiangtao Ran,Fengchun Jiang,Zhuo Chen,Hong Zhao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
A series of TA15 specimens with different process parameters were built by electron beam melting in this paper to systematicallyinvestigate the relationship of material-process-microstructure-mechanical properties. A quantitative mathematicalmodel of yield strength and Vickers hardness with respect to α lath thickness was established. Microstructure analysis resultsshowed that the microstructure of TA15 titanium alloy were basketweave microstructure, lamellar microstructure and bimodalmicrostructure depending on process. In general, the yield strength, Vickers hardness and α plate thickness are correlated withthe Hall-Petch equation, but the mathematical model established in this paper has a better fitting effect. Process parametersaffect the mechanical properties of the TA15 titanium alloy by affecting α lath thickness, and speed factor has the greatestinfluence on α lath thickness. The tensile properties of TA15 titanium alloy are as well as, if not better than, that of TA15titanium alloys with tri-modal microstructure.
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Research on the Technology of Alternative Continuous Wide Spectral Spatial Heterodyne Spectrometer
Wenli Zhang,Fengchun Tian,Zhenzhen Zhao,An Song,Li Zhang 한국광학회 2017 Current Optics and Photonics Vol.1 No.4
An innovative system for the alternative continuous wide spectral spatial heterodyne spectrometer (ACWSSHS)is proposed. The relationship between the ACWS-SHS and the wide spectral spatial heterodynespectrometer (WS-SHS) at the resolution limit, the spectral range, the grating diffraction efficiency and theinterference fringes contrast ratio has been analyzed theoretically. Through the comparison of the theoreticalanalysis and simulation results, it is found that the two systems for the WS-SHS and the ACWS-SHShave the same resolution limit and spectral range, which are and , while in the ACWS-SHS systemthe critical diffraction efficiency of echelle grating is 68.39% and the critical contrast ratio of interferencefringes is 0.4135, which is much better than the performance of the WS-SHS system. Therefore, the ACWSSHSreduces the high requirements for the precision of equipment and expands the application field ofSHS effectively.
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Antimicrobial and Cytotoxic Activity of Endophytic Fungi from Lagopsis supina
Zhang Dekui,Sun Weijian,Xu Wenjie,Ji Changbo,Zhou Yang,Sun Jingyi,Tian Yutong,Li Yanling,Zhao Fengchun,Tian Yuan 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.4
In this study, five endophytic fungi belonging to the Aspergillus and Alternaria genera were isolated from Lagopsis supina. The antimicrobial activity of all fungal fermented extracts against Staphylococcus and Fusarium graminearum was tested using the cup-plate method. Among them, Aspergillus ochraceus XZC-1 showed the best activity and was subsequently selected for large-scale fermentation and bioactivity-directed separation of the secondary metabolites. Four compounds, including 2- methoxy-6-methyl-1,4-benzoquinone (1), 3,5-dihydroxytoluene (2), oleic acid (3), and penicillic acid (4) were discovered. Here, compounds 1 and 4 displayed anti-fungal activity against F. graminearum, F. oxysporum, F. moniliforme, F. stratum, Botrytis cinerea, Magnaporthe oryzae, and Verticillium dahliae with diverse MIC values (128–512 μg/ml), which were close to that of the positive control antifungal, actidione (64–128 μg/ml). Additionally, compounds 1 and 4 also exhibited moderate antibacterial activity against S. aureus, Listeria monocytogenes, Escherichia coli, and Salmonella enterica, with low MIC values (8–64 μg/ml). Moreover, compounds 1 and 4 displayed selective cytotoxicity against cancer cell lines as compared with the normal fibroblast cells. Therefore, this study proposes that the endophytic fungi from L. supina can potentially produce bioactive molecules to be used as lead compounds in drugs or agricultural antibiotics.
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