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Study on Microstructure and Mechanical Properties of Friction Stir Welding Joints of In-Situ Al3Zr/AA6082 Particle-Reinforced Aluminum Matrix Composites

Li Hui, Sun Caizhi, Wang Feng, Qiao Yuanpeng, Li Chuying, Xu Pinyi, Zatulovskiy Andrii, Shcheretskyi Volodymyr

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 3

907--919

In this paper, the Al-K2ZrF6 reaction system was used to prepare in-situ Al3Zr/AA6082 particle-reinforced aluminum matrix composites by electromagnetic stirring melt reaction method, and the friction stir welding technology was used to weld the plate. The microstructure and mechanical properties of the welded joints were studied when the rotating speed was 14000 rpm and the welding speed was 30, 50 and 70 mm/min respectively. The results show that the weld forming quality and tensile properties of the FSW joints with welding parameters of 14000 rpm and 50 mm/min are the best, the tensile strength is 142(±0.5) MPa and the elongation is 8.2%. SEM analysis shows that the particle size of the reinforcing phase in the base metal is refined to about 5-10 μm, while that in the NZ is about 1-5 μm. The grain size in the HAZ is about 20-30 μm and in the NZ is about 5-10 μm. EBSD analysis shows that the proportion of low-angle grain boundary in the NZ is 59.7% and of recrystallized grain structure is 23.65%, while the proportion of small-angle grain boundary in the HAZ is 24.35% and of recrystallized grain structure is 37.18%. It provides theoretical and experimental basis for the forming and application of friction stir welding of the composite.

Analysis of vane loads and motion in a hydraulic double vane pump with integrated electrical drive

Fiebig Wiesław, Cependa Piotr, Kuczwara Hubert, Wang Feng

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 3

472--486

In this paper, the results of the analysis of the forces acting on vanes in a double-acting vane pump with an integrated electric drive have been presented. In the new motor pump unit, the pump is assembled inside the rotor of the electric motor. A dynamic model representing the vane movement has been developed considering the impact of pressure load distribution, vane support forces and friction forces. The loss of contact between the vane head and the cam ring lead to the noise and reduction of the volumetric pump efficiency. The dynamic model which describes the vane motion and contact between the vane tip and cam ring has been solved using MATLAB software. The influence of load distribution, pump design and operational parameters on the vane dynamics has been analysed.

Trzy lignany/neolignany z żywicy benzoinowej

Liang Qiu-Ming, Zhang Qing, Zhang Li, Wang Feng

Przemysł Chemiczny

2020

T. 99, nr 2

298--302

Z żywicy benzoinowej wyizolowano 3 nowe lignany/neolignany poprzez ekstrakcję etanolem, chromatografię kolumnową na żelu krzemionkowym i krystalizację z octanu etylu. Następnie zidentyfikowano je na podstawie analizy chemicznej i spektroskopii NMR jako benzoesan 2 -[(4-hydroksy-3-metoksyfenylo)-metoksymetylo] -5-(4-hydroksy-3-metoksyfenylo)-pent-4-enylu (I), benzoesan 2-[(4-hydroksy-3-metoksyfenylo)-metoksymetylo]- 5-(4-hydroksyfenylo)-pent-4-enylu (II) i 1-(3-hydroksy-4-metoksyfenylo)-2-etoksymetylo- 3-winylo-6-metoksyindano-5-ol (III).

Three new lignan or neolignan compds. were isolated from a benzoin resin by EtOH extn., silicagel column chromatog. and crystn. from AcOEt. They were then identified by chem. anal. and NMR spectroscopy as 2-[(4-hydroxy-3-methoxyphenyl)- -methoxymethyl]-5-(4-hydroxy-3-methoxyphenyl)-pent-4- enyl benzoate, 2-[(4-hydroxy-3-methoxy-phenyl)-methoxymethyl]- 5-(4-hydroxyphenyl)-pent-4-enyl benzoate and 1-(3-hydroxy-4-methoxyphenyl)-2-ethoxymethyl-3-vinyl-6 -methoxyindan-5-ol.