Interface and grain-boundary amorphization in the Al/Fe bimetallic system during pulsed-magnetic-driven impact

Fan, Zhisong; Yu, Haiping; Li, Chunfeng

doi:10.1016/j.scriptamat.2015.07.035

Cited by 44 publications

(7 citation statements)

References 25 publications

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“…According to the result above, we can deduce that localized SSA occurs near the GBs within nano-polycrystalline materials and the disordered GB acts as a seed for it. This simulation result is consistent with experiment results [1]. GB premelting [39,40] means that the GBs of the polycrystalline material have melted at a temperature below the melting point.…”

Section: The Process Of Localized Ssasupporting

confidence: 90%

“…Solid-state amorphization (SSA) from nano-crystalline (NC) parent phases has been intensively studied for decades [1,2]. It is always induced by mechanical deformation such as high pressure torsion [3,4], mechanical alloying [5], cryogenic laser shock peening [6], surface mechanical attrition [7], ball milling [8], high pressure [9][10][11], etc.…”

Section: Introductionmentioning

confidence: 99%

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Phase field crystal simulation of stress induced localized solid-state amorphization in nanocrystalline materials

Song

et al. 2017

J. Phys.: Condens. Matter

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In this work, the phase field crystal (PFC) method is used to study the localized solid-state amorphization (SSA) and its dynamic transformation process in polycrystalline materials under the uniaxial tensile deformation with different factors. The impacts of these factors, including strain rates, temperatures and grain sizes, are analyzed. Kinetically, the ultra-high strain rate causes the lattice to be seriously distorted and the grain to gradually collapse, so the dislocation density rises remarkably. Therefore, localized SSA occurs. Thermodynamically, as high temperature increases the activation energy, the atoms are active and prefer to leave the original position, which induce atom rearrangement. Furthermore, small grain size increases the percentage of grain boundary and the interface free energy of the system. As a result, Helmholtz free energy increases. The dislocations and Helmholtz free energy act as the seed and driving force for the process of the localized SSA. Also, the critical diffusion-time step and the percentage of amorphous region areas are calculated. Through this work, the PFC method is proved to be an effective means to study localized SSA under uniaxial tensile deformation.

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Section: The Process Of Localized Ssasupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Phase field crystal simulation of stress induced localized solid-state amorphization in nanocrystalline materials

Song

et al. 2017

J. Phys.: Condens. Matter

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“…Meanwhile, the shrinkage pores and microcracks are not only the supporting evidence for the formation of liquid, but also regarded as a clear indication of rapid melting and solidification at the interface in the EMPW of steel sheets [9]. Hence, the occurrence of amorphous layer is not surprising, which has been confirmed by TEM in the EMPW of Al-Fe bimetallic systems [13,22]. Figure 4e shows a magnified view of zone B in Figure 4a, where more local melting areas and porous structures are observed, in addition to some smaller discrete shear plateaus.…”

Section: Shear Plateau In Layer IIImentioning

confidence: 70%

“…In addition, they also observed that the thinner melting layer underwent an incredibly fast cooling rate to facilitate amorphization, while the thicker melting layer experienced recrystallization to form ultra-fine grains in a transition zone due to the lower cooling rate [12]. Furthermore, Fan et al [13] illustrated that the mechanical lattice instability and interdiffusion jointly promoted the amorphization at the Al/Fe interface in the ultra-high velocity impact process. However, the effect of fast local melting features/products and their distribution on the bonding performance is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Wang

Chen

Yan

et al. 2021

Metals

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The aim of this study was to characterize detailed microstructural changes and bonding characteristics and identify the formation mechanism of collision surface of Al6061–Q355 steel dissimilar welded joints via electromagnetic pulse welding (EMPW). The collision surface was observed to consist of five zones from the center to the outside. The central non-weld zone exhibited a concave and convex morphology. The welding-affected zone mainly included melting features and porous structures, representing a porous joining. The secondary weld zone presented an obvious mechanical joining characterized by shear plateaus with stripes. The primary weld zone characterized by dimples with cavity features suggested the formation of diffusion or metallurgical bonding. The impact-affected zone denoted an invalid interfacial bonding due to discontinuous spot impact. During EMPW, the impact energy and pressure affected the changes of normal velocity and tangential velocity, and in turn, influenced the interfacial deformation behavior and bonding characteristics, including the formation of micropores which continued to grow into homogeneous or uneven porous structures via cavitation, surface tension, and depressurization, along with the effect of trapped air.

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“…6,7) However, the dissimilar materials lead to the generation of brittle intermetallic compounds was harmful to the service life of welded joint. 8) Besides changing static parameters on improving strength had inconspicuous effects, the scholars tried to add the magnetic collector, 9) used double coils on the plate, 10) coated metal before welding, 11) and established the welding window. 12) But a dynamic welding process is completed instantly to cause unstable property of welded joint, 13) numerical simulation was done to gain the plastic deformation behavior of materials, 14,15) simulated characteristics of interface wave, 16) jet state generated by metal collision.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Simulation of Interfacial Morphology by Electromagnetic Pulse Welding with Aluminum to Steel

et al. 2021

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Electromagnetic pulse welding is a new promising method for solid-state joining of dissimilar materials. However, little understanding of the dynamic phenomena that leads interface morphology and intermetallic compounds to change. Initially, using Ansys Maxwell proved that the eddy current heat had a softening effect on aluminum alloy, and could press into the stainless steel in the semi-melted state. IMCs layer transferred from the unwelded zone (FeAl) to the flat welded zone (Fe 2 Al 5 +FeAl 2 +FeAl) to the wave interface (¡-Al+FeAl 3 ), the state of jet determined interface performance. Then, these insights were verified by SPH simulation, dispersed jet made soft aluminum alloy to produce the wave interface, a beam jet that aluminum particles were wrapped by steel particles produced the flat interface. Combination shear tests, the welded interface with high strength was characterized by large waveform, molten metal and a small amount of steel particles, formed Al-rich FeAl 3 . The welded seam with low strength shown brittle fracture characteristic of spherical intermetallic compounds iron-rich FeAl formed by retention jets. Therefore, the dominant mechanism of interface formation is that the compression and impact effect of jet accompanied by a softening effect of eddy current heat on aluminum alloy.

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Interface and grain-boundary amorphization in the Al/Fe bimetallic system during pulsed-magnetic-driven impact

Cited by 44 publications

References 25 publications

Phase field crystal simulation of stress induced localized solid-state amorphization in nanocrystalline materials

Phase field crystal simulation of stress induced localized solid-state amorphization in nanocrystalline materials

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Experimental Study and Numerical Simulation of Interfacial Morphology by Electromagnetic Pulse Welding with Aluminum to Steel

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