Effect of original layer thicknesses on the interface bonding and mechanical properties of Ti Al laminate composites

Abstract

It's of great significance in high-temperature aeroengine applications for large-surface-area Ti-Al laminate composites to be fabricated into Ti-Al 3 Ti parts by plastic forming and subsequent vacuum hot pressing. Then the original layer thicknesses have an important influence on the interface bonding and mechanical properties of Ti-Al laminate composites, but only few reports about it have been published so far. In the present study, vacuum hot pressing was employed to fabricate Ti-Al laminate composites using Ti and Al foils of different thickness. The resulting interface bond and mechanical properties of Ti-Al laminate composites were then studied to determine the optimum sheet configuration and thickness. To further assess their formability and develop a forming limit diagram (FLD), 0.1/0.15 Ti-Al laminate composites were operated on

Numerical Simulation of Ti/Al Bimetal Composite Fabricated by Explosive Welding

“…wavy interface [1,4,15]. According to Figure 3b and 3c, the jet did not exist at the initial stage of the explosion, with the collision point moving forward, periodic wave structures were formed as the jetting appeared.…”

“…In contrast, the bonding interface close to the detonation point showed a linear morphology (position "b"), while the bonding interface away from the detonation point achieved a wavy morphology (position "c"). It is generally accepted that the occurrence of jetting at the collision interface is one of the necessary conditions for the formation of a wavy interface [1,4,15]. According to Figure 3b,c, the jet did not exist at the initial stage of the explosion, with the collision point moving forward, periodic wave structures were formed as the jetting appeared.…”

“…The high pressure generates a high plastic deformation which, in turn, produces a large value of plastic strain. The strong plastic deformation around the interface is one of the bonding mechanisms of explosive welding [1,3,4,15,16]. The grain refinement and high-density dislocations around the interface have been suggested in many experimental studies on explosive welding [1,15,16,32], which reveals that there appears a strong plastic deformation near the interface.…”

“…In order to reproduce the actual physical process of explosive welding, the explosion of explosives and the acceleration of the flyer plate should be also considered. Ti/Al bimetal composites have been widely used in the industry [1,3,[15][16][17]. There are many reports concerning the EXW of Ti and Al.…”

“…Most previous experimental studies focused on the microstructure and mechanical characteristics of Ti/Al layered materials [3,16,17]. However, the Ti/Al bimetal composites have been widely used in the industry [1,3,[15][16][17]. There are many reports concerning the EXW of Ti and Al.…”