Grain and texture evolution in nano/ultrafine-grained bimetallic Al/Ni composite during accumulative roll bonding

Sandwich‐Like Cu/Al/Cu Composites Fabricated by Cryorolling

“…When the rolling temperature is À100 or À190 C, the movement of the dislocation and dynamic recovery are depressed, resulting in finer grain sizes. [33,34] The similar results have been reported in Al and Cu alloys. [20,21] Grain refinement appears in the composites lamellar with the decrease in the rolling temperature.…”

“…In contrast, when the temperature is lower than the room temperature, the dislocation density will sharply increase with the decrease in the deformation temperature. When the rolling temperature is −100 or −190 °C, the movement of the dislocation and dynamic recovery are depressed, resulting in finer grain sizes . The similar results have been reported in Al and Cu alloys .…”

“…In Figure a, necking appears in the AlCu intermetallic layer during cryorolling at −190 °C, resulting from local plastic heterogeneities associated with the different plastic characteristics of the Cu and Al composites, which is similarly observed in Al/Ni composite during accumulative roll bonding . This indicates that the AlCu intermetallic layer reaches the condition for strain instability considerably earlier than the Al layer for the composites subjected to cryorolling at −190 °C.…”

“…In Figure 4a, necking appears in the AlCu intermetallic layer during cryorolling at À190 C, resulting from local plastic heterogeneities associated with the different plastic characteristics of the Cu and Al composites, which is similarly observed in Al/Ni composite during accumulative roll bonding. [34] This indicates that the AlCu intermetallic layer reaches the condition for strain instability considerably earlier than the Al layer for the composites subjected to cryorolling at À190 C. The phenomenon of necking becomes slight with increase in the rolling temperature. In Figure 1, the yield stress of laminates increases as the rolling temperature increases from À190 to À100 C, although the grain size of laminates increases, which is mainly resulted from the numerous voids around necking regions.…”

Improving the fracture toughness of multi-layered commercial pure aluminum via warm accumulative roll bonding

“…The fast and low-cost processing of ARB has introduced it as one of the best technique to produce metallic sheets with UFG structure. Numerous studies have addressed the mechanical properties and microstructural alterations of metals and different alloys such as aluminum, copper, nickel, steel, and titanium [11][12][13]7,14,15]. Qualitative and quantitative investigations indicated a decrease in the grain size as well as wide variations in the dislocation density and other microstructural parameters, an increase of strength and hardness, brittleness enhancement, and edge cracking in the prepared samples [16][17][18].…”