Laser welding of Zr45Cu48Al7 bulk glassy alloy

Li, B.; Li, Z.Y.; Xiong, Jun; Xing, Li; Wang, D.; Li, Y.

doi:10.1016/j.jallcom.2005.07.005

Cited by 110 publications

(52 citation statements)

References 15 publications

(10 reference statements)

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“…[13][14][15][16] Further more, studying the binary MGs may enhance our understanding of the formation of their corresponding multicomponent MGs. [17][18][19][20][21] An interesting phenomenon was found that although these binary systems have the broad composition regions forming MG, the best glass formers are located at some pinpoint compositions. 8,9 The existing rules and criteria fail to explain this phenomenon, resulting in the absence of the guiding principle for developing more MG compositions with high GFA in binary alloy systems.…”

Section: Introductionmentioning

confidence: 99%

Structural origin of the pinpoint-composition effect on the glass-forming ability in the NiNb alloy system

2013

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Great research efforts to investigate the glass-forming ability (GFA) in alloys have been made, leading to an observation that a pinpoint composition produces the best glass-forming characteristics. The reason for this observation is still unknown, limiting the development of bulk metallic glasses (MGs) with a relatively large size. In this work, systematic experimental measurements coupled with calculations were performed to address this issue using the NiNb binary alloy system. It is found that the atomic-level packing efficiency and the clusters-level regularity parameters strongly contribute to their GFA. In particular, the best glass former found in a pinpoint composition possesses the local maximum of the atomic-packing efficiency and the highest degree of the cluster regularity. This work provides an understanding of GFA from atomic and cluster levels and will shed light on the development of more MGs with relatively large critical casting sizes.

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Section: Introductionmentioning

confidence: 99%

Structural origin of the pinpoint-composition effect on the glass-forming ability in the NiNb alloy system

2013

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“…Some studies reported that crystallization in the heat-affected zones (HAZ) occurred occasionally in welding of glassy metals with a CW or a pulsed laser beam. [4][5][6][7] It means that it is difficult to keep an amorphous phase in the HAZ of glassy metal in LAMP joining with a CW laser beam. Therefore, in order to evaluate the joints of dissimilar materials, the shear tensile strengths were measured in the tensile test, and the formation or disappearance of an amorphous phase in the glassy metal was confirmed by the microfocused XRD and through TEM with high-resolution microstructure observation and diffraction-patterns analysis.…”

Section: Introductionmentioning

confidence: 99%

Laser Direct Joining of Glassy Metal Zr55Al10Ni5Cu30 to Engineering Plastic Polyethylene Terephthalate

et al. 2010

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Metals and plastics are widely used in industrial applications, and glassy metals are recently receiving a considerable attention in terms of high strength and great corrosion resistance. Joining of a metal or glassy metal to a plastic is necessary and important in manufacturing high performance products. Therefore, we have developed laser-assisted metal and plastic (LAMP) joining as an innovative rapid bonding process without adhesives or glues. In this research, therefore, LAMP joining was applied to bond Zr 55 Al 10 Ni 5 Cu 30 metallic glass sheet and polyethylene terephthalate (PET) plate. The LAMP joint exhibited the same strength as the base glassy metal. According to the results of X-ray diffraction (XRD) and diffraction patterns of transmission electron microscope (TEM), samples were confirmed to be still amorphous. Moreover, TEM photos and energy dispersive X-ray spectroscopy (EDS) analysis demonstrated that the glassy metal and the plastic were tightly bonded on the atomic or molecular size level through zirconium oxide film covering glassy metal. Consequently, it was revealed that a Zr 55 Al 10 Ni 5 Cu 30 metallic glass sheet was directly joined onto an engineering plastic PET plate and kept amorphous phase of the metallic glass after the LAMP joining.

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“…However, the metastable nature of BMGs against relaxation and crystallization is still a huge challenge for most techniques that are suitable for joining crystalline materials. Many welding methods for BMGs have been developed, including friction, pulsecurrent, electron-beam, laser, explosive and thermoplastic welding [13][14][15][16][17][18][19][20]. Among these methods, explosive welding shows a significant advantage, because a large area of atomic-scale joint is achieved within a short duration and the glassy structures of BMGs can be preserved [19][20].…”

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confidence: 99%