Effect of Individual Layer Shape on the Mechanical Properties of Dissimilar Al Alloys Laminated Metal Composite Sheets

Chen, Zejun; Wu, Xiaohu; Hu, Hongbo; Quanzhong, Chen; Qing, Liu

doi:10.1007/s11665-013-0804-8

Cited by 8 publications

(9 citation statements)

References 41 publications

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“…The instable interface curvature and individual layer shape lead to instabilities of the mechanical properties of LMCs. Previous studies show that the local accumulation of nonuniform strain causes the instability of mechanical properties, which can be proved by the results reported in the literatures [14,36,42,48,49]. The waviness of the bonding interfaces changes the total thickness of AA7075 layers along different sections of the LMCs sheets.…”

Section: Mechanical Properties Of Lmcsmentioning

confidence: 68%

“…Previous studies show that the strength of dissimilar LMCs fabricated by ARB first decreases and then increases; the elongation decreases after two rolling cycles [37][38][39][40][41][42]. The increase of strength is contributed by the hardening of sample caused by piling up of the dislocations and grain refinement [20,23,48,49].…”

Section: Resultsmentioning

confidence: 94%

“…With the increase of strain, constituent metals begin to incur the nonuniform deformations, and the thickness of layers starts to vary. Necking starts to occur in the hard layer, and the soft layer protrudes into the hard layer filling it up [23,42,48,49]. The necking of the AA7075 layers causes its upper and lower surfaces to form an angle of about 30 ∘ , and the waviness of the AA1100 layers results in an angle between the bonding interfaces and the rolling direction of ±15 ∘ (Figure 4(b)).…”

Section: Resultsmentioning

confidence: 99%

“…The grain refinement is mainly attributed to the shear action of dissimilar metals at the bonding interface [49]. The initial strengths as well as strain hardening behaviors of the two constituent metals (AA1100 and AA7075) are different.…”

Section: Resultsmentioning

confidence: 99%

“…The waviness of the bonding interfaces changes the total thickness of AA7075 layers along different sections of the LMCs sheets. Therefore, the yield strength and elongation to fracture of LMCs decrease with increasing variation of individual layer shape and necking [14,49,51]. With increasing number of layers, the average layer thickness gradually reduces, the curvature of the bonding interfaces weakens, and the necking of AA7075 layers shows local short-range characteristic.…”

Section: Mechanical Properties Of Lmcsmentioning

confidence: 99%

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Interface Shear Actions and Mechanical Properties of Nanostructured Dissimilar Al Alloy Laminated Metal Composites

Chen

Quanzhong

2015

Journal of Nanomaterials

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The laminated metal composites (LMCs) of dissimilar metals (aluminium alloys: AA1100/AA7075) were fabricated using the accumulative roll bonding technique in conjunction with cold rolling. The LMCs of ultrafine grained AA1100 and nanostructured precipitates of AA7075 achieved metallurgical bonding. The microstructure of the bonding interfaces and constituent metals was investigated using scanning electron microscopy and transmission electron microscopy for the LMCs with different layers. The deformation incompatibility and shear actions were analyzed using the microanalysis of dissimilar bonding interfaces. The mechanism of grain refinement of LMCs was investigated and described based on the microstructure characterization. The mechanical properties, strengthening mechanism, and fracture mechanism of LMCs were also investigated. The research results showed that the strengthening mechanism of LMCs is the recombination action of grain refinement, dislocation, and laminated interfacial strengthening. The coordinated deformation of dissimilar metals and the layer thickness are important in improving the mechanical properties of LMCs consisting of dissimilar metals.

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