Combustion Synthesis Reactions in Cold-Rolled Ni/Al and Ti/Al Multilayers

Abstract

In this article, a cold rolling method was developed to fabricate Ni/Al and Ti/Al multilayer foils, and the combustion synthesis reactions in the cold-rolled foils were investigated. Combustion synthesis reactions were initiated by heating one end of the cold-rolled foil in a flame for several seconds. The Ni/Al foils went through three reaction stages. The first reaction stage was a displacement of reaction zone with Al 3 Ni as the reaction product. During the second stage, the part of the foil in the flame underwent thermal explosion. In the last stage, the heat released by thermal explosion triggered a self-propagating high-temperature synthesis (SHS) reaction across the foil that resulted in the formation of AlNi. In contrast, the Ti/Al foils experienced only two reaction stages. First, a displacement of the reaction zone propagated across the foil with formation of Al 3 Ti at the Ti/Al interface. Then a thermal explosion reaction occurred in the part of foil that was heated in the flame, resulting in many different phases in the reacted foil.

Influence of bonding pressure on thermal resistance in reactively-bonded solder joints

“…Self-propagating exothermic reaction, which is driven by a reduction in atomic binding energy, has been found in various types of nanometer-thick multilayer films, such as Al=Ni, Al=Ti, and Ni=Si films. [1][2][3] This reaction easily starts with a pulse of energy, such as a small electrical spark, and continues to generate heat during intermetallic compound formation. The exothermic heat automatically propagates very rapidly in a direction parallel to the layering in the films.…”

Combustion synthesis in nanostructured reactive systems

“…135 Our previous reviews on combustion synthesis were dedicated to 136 specific aspects of this effective energy saving route to produce 137 materials, which includes solution combustion synthesis of oxides 138 [9], CS of nanopowders [10] and exothermic reaction waves in 139 multilayer nano-foils [11] and other nano-systems [12]. This 140 review places emphasis on material science aspects of nano-struc- 141 tured reactive systems. 142 Analysis of recent research papers on heterogeneous combus- 143 tion has clearly revealed that the new classes of reactive systems, 144 which are characterized by nanosized-scale and possess extremely 145 high reactivity, as compared to similar reactive systems with 146 micro-scale heterogeneity, has attracted the attention of 147 researchers and has dominated R&D. The present paper gives an 148 overview of four classes of such reactive nano-media: (i) mechani- 149 cally-structured composites; (ii) sol-gels; (iii) mixtures of metal 150 and metal-oxide nanopowders, i.e., so-called, super thermite 151 compositions and (iv) multilayer nano-foils.…”

Enhanced materials performance of Al/Ti/Al laminate sheets subjected to cryogenic roll bonding

“…In rncnnt ynars, 'sandwice' laminatn sennts eavn attractnd a grnat dnal of attnntion dun to tenir nxcnllnnt propnrtins [1][2][3][4] weice makn tenm idnally suitnd for divnrsn functions suce as ballistic protnction, enat nxceangn, blast mitigation and vibration damping [5][6]. Roll-bonding tnceniquns eavn bnnn succnssfully applind to fabricatn multicomponnnt matnrials wite tailornd propnrtins by rninforcnmnnt or grading, suce as Al/Ti [7][8][9][10][11][12], hu/Ti [13,14], Al/Mg [15,16], Al/hu [17,18] and Al/Stnnl [19,20].…”

“…Tenrn arn somn rnports teat Al/Ti/Al laminatn sennts fabricatnd by room-tnmpnraturn roll bonding [7][8][9][10][11][12]. Yu nt al [7] fabricatnd a trimodal laminatn sennts combinnd wite coarsn-grainnd Al, ultrafinn-grainnd Ti and TiAl3 particlns combinnd room-tnmpnraturn roll bonding and annnaling.…”