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Efficient synthesis of functionalized butenolides mediated by vinyltriphenylphosphonium salts in aqueous media

Chinese Chemical Letters 2011年第1期22卷 49-52页

作者： mohammad A.Khalilzadeh Adel Hasannia mohammad m.baradarani Zinatossadat Hossaini Department of Chemistry Islamic Azad UniversityQaemshahr BranchMazandaranIran Department of Chemistry Faculty of ScienceUrmia UniversityUremiaIran

An efficient synthesis of 5-oxo-2,5-dihydro-3-furancarboxylate derivatives via reaction of dialkyl acetylenedicarboxylate with triphenylphosphine （Ph3P） in the presence of activated carbonyl compounds such as ethyl ... 详细信息

关键词： Ethyl pyruvate Triphenylphosphine N-Alkylisatin Butenolides Dialkyl acetylenedicarboxylates

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Effect of ultrasonic assisted friction stir welding on microstructure and mechanical properties of AZ91-C magnesium alloy

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Transactions of Nonferrous metals Society of China 2019年第12期29卷 2514-2522页

作者： Faraz baradarani Amir mOSTAFAPOUR maghsoud SHALVANDI Faculty of mechanical Engineering University of Tabriz

The influence of ultrasonic vibrations on microstructure and mechanical properties of the AZ91-C magnesium alloy after ultrasonic assisted friction stir welding(UaFSW)in comparison with conventional friction stir welding(FSW)was *** FSW was applied at the rotational speed of 1400 r/min and welding speed of 40 mm/min and no defects were *** the same welding parameters,the process was carried out with inducing ultrasonic vibrations to the weld line at the amplitude of 15μ*** microstructure of the specimens was observed with optical and scanning electron *** results indicate that a very fine microstructure is obtained in UaFSW with respect to that of conventional ***,β-mg17Al12 coarse dendrites are segregated to very fine and partly spherical particles that homogeneously distribute inα-mg *** remarkably-modified morphology of microstructure attributed to severe plastic deformation comes from ultrasonic vibration and friction stirring *** and hardness tests were performed to evaluate the mechanical properties of the *** to the results,the vibration greatly improves the mechanical properties of the conventional FSW *** tensile strength and hardness are increased from 195 mPa and HV 79 in conventional FSW to 225 mPa and HV 87 in UaFSW,respectively.

关键词： ultrasonic assisted friction stir welding AZ91 magnesium alloy microstructure mechanical properties

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