Microstructure characterization and mechanical properties of Ti-based bulk metallic glass joints prepared with friction stir spot welding process

Jamili-Shirvan, Zahra; Haddad-Sabzevar, M.; Vahdati-Khaki, Jalil; Chen, Na; Shi, Qingyu; Yao, Kefu

doi:10.1016/j.matdes.2016.03.074

Cited by 14 publications

(14 citation statements)

References 38 publications

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“…Figure 15c shows a brittle cleavage fracture, whereas Figure 15d shows a ductile fracture with typical shear dimples [40,42]. It can be inferred that the impact fracture mode of the keyhole-free FSSW joint is the mixed ductile and brittle fracture mode [40,42]. Most of the impact energy is absorbed by the ductile fracture.…”

Section: Impact Fracturementioning

confidence: 95%

“…According to the welding process and connection mode, the impact fracture morphology is divided into the three zones noted as the non-action zone (NAZ), shoulder action zone (SAZ), and the stir zone (TSZ). The NAZ is weakly connected, and the fracture shows a shallow dimple-like morphology [11,[42][43][44][45], which is not affected by the plunge force of the shoulder. This is the edge of the keyhole-free FSSW joint shown in Figure 8b, where the IMCs were not completely filled.…”

Section: Impact Fracturementioning

confidence: 99%

“…This is the edge of the keyhole-free FSSW joint shown in Figure 8b, where the IMCs were not completely filled. Therefore, the cracks develop from the gaps and propagate into the weld [37,[42][43][44][45]. SAZ has a deeper dimple and stronger connection [42][43][44][45], which is affected by the dual effects of the friction heat and the plunge force of the shoulder.…”

Section: Impact Fracturementioning

confidence: 99%

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Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Zhang

Zhao³

et al. 2019

Metals

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This work systematically investigates the interface behavior and impact properties of the keyhole-free friction stir spot welding (FSSW) of a dissimilar metal AA6082-T4 Al alloy and DP600 galvanized steel. The keyhole is eliminated by pin retraction technology. The welding process is in accordance with the welding temperature curve and the maximum temperature of the periphery of the shoulder, measured at about 500 °C. The transition layers were formed at the interface, in which the Al, Fe, and Zn elements form an inhomogeneous diffusion. A cloud cluster-like mechanical mixing of the Al and steel components is formed in the stirring zone. The impact toughness of the specimen with a welding parameter of 1000 rpm is the best. To a certain extent, the factors affecting the impact energy are not the maximum impact load but the maximum impact deformation. The maximum impact deformation directly reflects the post-crack propagation energy, which significantly affects its impact toughness. In addition, the impact fracture showed a mixed ductile and brittle fracture mode with a brittle–ductile transition zone. Most of the impact energy was absorbed by the ductile fracture.

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Section: Impact Fracturementioning

confidence: 95%

Section: Impact Fracturementioning

confidence: 99%

Section: Impact Fracturementioning

confidence: 99%

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Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Zhang

Zhao³

et al. 2019

Metals

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“…To date, numerous efforts have been devoted to increase the 3D size of BMGs, including optimization of chemical composition and preparation technology, welding and 3D print process [3][4][5][6][7][8][9]. High energy beam welding, as a modern welding process, has been widely used because of its advantages such as deep welding penetration, high welding energy density, and little deformation and so on [10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and crystallization mechanism of Ti-based bulk metallic glass by electron beam welding

Wang

Huang

Cao

et al. 2018

Journal of Manufacturing Processes

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In this work, we report on the successful welding of the Ti-based bulk metallic glass (BMG) plates via electron beam welding route. Microstructure determination shows that crystalline phases exist both in weld zone (WZ) and heat affected zone (HAZ). The critical cooling rate for glass formation in WZ is depended on the solidification condition. The continuous heating transformation curve (CHT) of glass transition temperature (Tg) and crystallization temperature (Tx) during heating process, time-temperature-transformation diagram (C-curve) during cooling process, and the thermal cycle curves are obtained by Kissinger equation, nucleation theory, and temperature field simulation, respectively. The crystallization mechanism in HAZ was discussed in details during the heating and cooling processes. The intersection between cooling curve and C-curve denotes the crystallization of HAZ during the cooling process.

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“…Particularly for BMGs, the metastable nature and resulting incompatibility with conventional processing and joining methods have become stumbling blocks for their practical applications 7, 8 . To address the ability to join BMGs, various techniques that have been developed specifically or tailored for BMGs based on liquid-state processing including electron beam welding 9, 10 , laser beam welding 11, 12 , gas tungsten arc (GTA) welding 13 , and pulse current method 14, 15 ; or solid-state processing including friction welding 16, 17 , explosion welding 18 , ultrasonic welding 19, 20 , diffusion bonding 21 , spark welding 22 , and resistance spot welding 23 . Recently, a thermoplastic-based method 24 and a liquid-solid joining method 7 were introduced.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Laser Beam Welding of Pd43Cu27Ni10P20 Bulk Metallic Glass

Shao

Datye

Huang

et al. 2017

Sci Rep

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We used pulsed laser beam welding method to join Pd43Cu27Ni10P20 (at.%) bulk metallic glass and characterized the properties of the joint. Fusion zone and heat-affected zone in the weld joint can be maintained completely amorphous as confirmed by X-ray diffraction and differential scanning calorimetry. No visible defects were observed in the weld joint. Nanoindentation and bend tests were carried out to determine the mechanical properties of the weld joint. Fusion zone and heat-affected zone exhibit very similar elastic moduli and hardness when compared to the base material, and the weld joint shows high ductility in bending which is accomplished through the operation of multiple shear bands. Our results reveal that pulsed laser beam welding under appropriate processing parameters provides a practical viable method to join bulk metallic glasses.

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Microstructure characterization and mechanical properties of Ti-based bulk metallic glass joints prepared with friction stir spot welding process

Cited by 14 publications

References 38 publications

Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Microstructure and crystallization mechanism of Ti-based bulk metallic glass by electron beam welding

Pulsed Laser Beam Welding of Pd43Cu27Ni10P20 Bulk Metallic Glass

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