Effect of Interface on the Deep Drawability of Ti/Al Multilayered Composites

Abstract

Ti/Al multilayered composites (LMCs) with different layers were prepared by hot-pressing and hot-rolling. The effects of interface on the deep drawability of LMCs were explored. The results indicate that LMCs with more layers have a higher limit-drawing ratio (LDR) and exhibit an excellent deep drawability. The texture strength of the Ti layer gradually weakens with the increase of layers, which leads to the smaller yield ratio (σs/σb), the plastic strain ratio (r), and the larger strain hardening index (n), thus the deep drawability of LMCs with more layers is enhanced effectively. The Ti/Al interfaces in three, five, and seven layers of LMCs exhibit straight, small wave-like interlocking, and dense serrated structures at the corner of the cylindrical parts, respectively. The component metals become thinner with the increase of layers, and the increased interfacial pressure promotes the formation of an increasingly firm overlapped interfacial structure. The load transfer via the interfaces makes the stress distribution between layers more uniform with the increase of layers, which helps to coordinate deformation. Deflection and tearing occur when the cracks propagate to the interface due to the complex stress state, which hinders and delays the crack penetration, thereby improving the deep drawability of LMCs with more layers.

Effects of sinusoidal vibration of casting-roller on interface microstructure of Ti/Al laminated composites by twin-roll casting

“…Ti/Al laminated composites not only combine the advantages of titanium and aluminum alloy but can relatively reduce costs, thus it is widely used in the fields of aerospace, national defense, the petrochemical industry, transportation, metallurgical machinery and equipment manufacturing, etc. 5,6 Currently, a variety of techniques have been developed for the manufacture of Ti/Al laminated composites such as explosive welding, 7,8 hot rolling bonding, 9,10 casting bonding, 11,12 diffusion bonding, 13 differential temperature rolling bonding, 14,15 accumulative roll bonding, 16,17 and they also have been successfully applied to fabricate other similar or dissimilar bimetallic composites. However, twin-roll casting bonding has been extensively investigated because of short processing time, low cost, and low energy consumption, 18 and it has been successfully applied to prepare Invar/Cu, 19 Cu/Al, 20 steel/Al, 21 etc.…”

“…Ti/Al laminated composites not only combine the advantages of titanium and aluminum alloy but can relatively reduce costs, thus it is widely used in the fields of aerospace, national defense, the petrochemical industry, transportation, metallurgical machinery and equipment manufacturing, etc. 5,6…”

Studies on Hot-Rolling Bonding of the Al-Cu Bimetallic Composite

“…The discovery of new materials with special properties, against the background of resource depletion and the need to recycle existing materials, always arouses the interest of researchers [1][2][3][4][5][6][7][8][9][10][11][12][13][14] around the world. The production of light-resistant materials, which is necessary for the aeronautical, naval, energy, electrical, and electronic industries, pushes research towards the association of materials with completely different properties [15][16][17][18][19][20][21][22].…”

“…Copper's properties such as its high thermal and electrical conductivity, high modulus of elasticity, and good strength makes it widely useable for gas and water pipe devices, which allows heat transfer such as boilers, electronic circuits, and electrical components within the fields of industry: energy, aeronautical, naval, and automotive. Copper was used as a reinforcing element in the production of rolling composite materials [8,9,11,17,21,[23][24][25], through the ARB process (accumulative roll bonding) [7,[9][10][11][12][19][20][21][22][23][24][25] or hot rolling [1,2,17,18]. Along with other materials such as Ti, Sn, Mg, Fe, Nb, and Al, the properties of rolled composites have increased [3,9,15,17,21,[23][24][25].…”

“…Along with other materials such as Ti, Sn, Mg, Fe, Nb, and Al, the properties of rolled composites have increased [3,9,15,17,21,[23][24][25]. The problem with the bonding mechanism within layers of composite materials was the main subject of numerous studies [1,2,7,[9][10][11][12][15][16][17][18][19][20][21][22][23][24][25], throughout the last decades. Regarding the mechanism of the bonding of the layers, the theories were dependent on the choice of the deformation process [3,[16][17][18] (in this case rolling), which can take place through hot or cold conditions.…”