Theoretical and experimental analysis of the rolling process of bimetallic rods Cu-steel and Cu-Al

Solidification processed Mg/Al bimetal macrocomposite: Microstructure and mechanical properties

“…The results of literature search indicate that no attempt has been made to integrate Mg and Al in millimeter length scale with an objective of improving the overall tensile behavior of Mg using a relatively lower cost processing methodology. Limited studies have been done on bimetal rolling of cladded sheet and extrusion of cladded rod, involving the Al-Cu [13][14][15][16][17], Cu-steel [14][15][16][17], Al-steel [18,19], brass-steel [20], Al-Zn [21], Al-Sn [21], Al-Pb [21,22] and Ni-Ti [23] bimetal material systems. Findings include different growth rates of intermetallic compound in bimetal composites processed in different ways [13], the bimetal interface having higher hardness [14,21,23], non-uniform deformation being accommodated by the softer metal near the interface based on micromechanical interactions [16,17], near-interface localization of strain on the high strength metal side [17], consumption of large part of deformation energy and resultant slightly lower than theoretical weld strength [17], bimetallic interface having lower crack propagation resistance compared to that within the separate metals [18], sub-critically thick intermetallic layer and parallel-oriented interface causing bond strength increase at the bimetal interface [22] and compressive stress of the bimetal composite being higher than the separate metals [23].…”

3D FEM modelling and experimental investigations of Al–Cu bimetallic bars rolling process in modified grooves

“…The mean elongation factor for those passes amounted to 1.16. Whereas, the mean elongation factor for this type of passes in rolling homogeneous bars is normally around 1.23; however, in the case of rolling bimetallic bars of the soft core-hard cladding layer (Al-Cu) type, the bimetallic band widening in the roll gap is larger compared to the widening obtained in rolling homogeneous aluminium bars [3,16]. In accordance with the constant volume law, in rolling, with the increase in widening, the elongation decreases [15].…”

Interface characterization and formability of two and three-layer composite sheets manufactured by roll bonding

“…By increasing friction, shear stress and development of shear zone, the interlayer bond strength would increase [11]. It is shown that at a constant rolling reduction rate, by increasing the ratio of layers strength, the neutral position of the roll in contact with high strength layer would move to the entry side of the roll gap and finally shear zone extends [18,19]. In this zone, intensive shear stress caused by friction leads to plastic instability at the interface and cracks form on both surfaces.…”