Reactive brazing of Al alloy to Mg alloy using zinc-based brazing alloy

Liu, Liming; Tan, Jacqueline; Liu, Xujing

doi:10.1016/j.matlet.2006.09.016

Cited by 61 publications

(31 citation statements)

References 6 publications

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“…However, Mg‐Al intermetallic compound on Al side is brittle, which limits the further improvement of adhesive strength of coating and weld joint by PHT. This phenomenon has also been found in Mg/Al fusion welding in previous studies 15, 16…”

Section: Resultssupporting

confidence: 86%

Dramatic Fluorescence Enhancement of Bare Carbon Dots through Facile Reduction Chemistry

et al. 2012

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Reduction of bare carbon dots (CDs) in aqueous NaBH(4) solution is a facile and effective approach to enhance their fluorescence without any surface coverage. CDs are treated with dilute aqueous NaBH(4) solutions, enhancing their quantum yields (QYs) successfully from 1.6 % to 16 % which is comparable to semiconductive QDs in aqueous environments. If pristine CDs are treated hydrothermally prior to reduction by NaBH(4), QYs reach 40.5 %. This value is among the highest QYs reported for bare CDs in the literature. The approach to enhance fluorescence through chemical reduction is generally applicable to other kinds of CDs synthesized by various methods. Alteration of the chemical structure of the CDs by NaBH(4)-reduction is analyzed by (13) C NMR, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy, which demonstrate that the carbonyl group content is decreased after NaBH(4)-reduction, whereas the number of sp(3)-type carbon defects is increased. The valence-band maxima (VBM) near the surface related to the surface energy bands of the CDs are estimated by XPS. VBM data show a semiconducting layer on the surface of the CDs, and the VBM of the CDs decrease with increasing NaBH(4)-reduction time. The layered graphite structures in the cores of the CDs are clearly observed by transmission electron microscopy (TEM). CDs could perhaps be regarded as semiconductive surface defect layers formed by chemical erosion over conductive graphite cores. Chemical reduction by NaBH(4) changes the surface-energy bands of the CDs, thus, enhances their fluorescence. The fluorescence properties of aqueous NaBH(4)-reduced CDs are also studied for possible biological applications.

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Section: Resultssupporting

confidence: 86%

Dramatic Fluorescence Enhancement of Bare Carbon Dots through Facile Reduction Chemistry

et al. 2012

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“…Therefore, it is necessary to avoid the formation of Mg-Al IMCs by reducing the joining temperature lower than the Mg-Al intermetallic reaction point. Compared with those methods above, brazing or soldering has many advantages in joining Mg-Al, due to its variable solders and bonding temperature selection [12][13][14]. Wang et al [15] has designed a series of Sn-xZn solders for joining Mg/Al dissimilar metals.…”

Section: Introductionmentioning

confidence: 99%

Rapid Ultrasonic-Assisted Soldering of AZ31B Mg Alloy/6061 Al Alloy with Low-Melting-Point Sn–xZn Solders Without Flux in Air

Lai

Huang

Pan

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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A novel ultrasonic-assisted low-temperature soldering was developed to join AZ31B Mg alloy and 6061 Al alloy with a series of Sn-xZn solders. The average maximum shear strength of the joints reaches up to 87.5 MPa at soldering temperature of 300°C under ultrasonic assistance for only 5 s using Sn-20Zn solder. The fracture path propagates completely in the soldering seam. The results indicate that the microjet generated by ultrasonic pressure in liquid solder could strike and splinter the Mg 2 Sn intermetallic compounds into small pieces, which contributes to the enhancement of the joint strength. In addition, the primary Al(Zn) solid solution phase formed during cooling stage could also strengthen the joint due to the prevention of microcracks propagation.Acta Metallurgica Sinica (English Letters) (2019) 32:332-342 https://doi.org/10.1007/s40195-018-0749-x( 012 3456789(). ,-volV) (0123456789().,-volV)

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“…[3][4][5][6]. However, the pressure welding and brazing have special requirements on the size and shape of the workpiece, and their adaptability is not sufficient [7][8]. The fusion welding method is more flexible, and has high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Analysis of microstructure and properties of Mg/Al dissimilar joints by GTAW with Al-Si filler wire

DU¹,

LI²,

XU³

et al. 2016

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Mg/Al dissimilar materials were welded successfully by gas tungsten arc welding (GTAW) using SAlSi-1 and SAlSi-2 welding wire. The joints with good surface forming and free of defects were achieved. The Mg/Al welded joints were analyzed by means of optical microscope, scanning electron microscope and micro-sclerometer. The results show that the fusion area on magnesium side is obviously divided into columnar crystal zone and dendritic crystal zone. More intergranular precipitates were observed in dendritic crystal zone than in columnar crystal zone. However, the weld area is the typical columnar zone. No high microhardness brittle phase was observed in the fusion area near magnesium side. The microhardness of weld zone is slightly higher than magnesium base metal, and far lower than the Al base metal.K e y w o r d s : dissimilar material, GTAW, microstructure, microhardness

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Reactive brazing of Al alloy to Mg alloy using zinc-based brazing alloy

Cited by 61 publications

References 6 publications

Dramatic Fluorescence Enhancement of Bare Carbon Dots through Facile Reduction Chemistry

Dramatic Fluorescence Enhancement of Bare Carbon Dots through Facile Reduction Chemistry

Rapid Ultrasonic-Assisted Soldering of AZ31B Mg Alloy/6061 Al Alloy with Low-Melting-Point Sn–xZn Solders Without Flux in Air

Analysis of microstructure and properties of Mg/Al dissimilar joints by GTAW with Al-Si filler wire

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