On the Disintegration of A1050/Ni201 Explosively Welded Clads Induced by Long-Term Annealing.

Izabella Kwiecien,Anna Wierzbicka-Miernik,Maciej Szczerba,Piotr Bobrowski,Joanna Wojewoda-Budka,Zygmunt Szulc

doi:10.3390/ma14112931

Izabella Kwiecien, Anna Wierzbicka-Miernik + Show 4 more

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https://doi.org/10.3390/ma14112931

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Abstract

The paper presents the microstructure and phase composition of the interface zone formed in the explosive welding process between technically pure aluminum and nickel. Low and high detonation velocities of 2000 and 2800 m/s were applied to expose the differences of the welded zone directly after the joining as well as subsequent long-term annealing. The large amount of the melted areas was observed composed of a variety of Al-Ni type intermetallics; however, the morphology varied from nearly flat to wavy with increasing detonation velocity. The applied heat treatment at 500 °C has resulted in the formation of Al3Ni and Al3Ni2 layers, which in the first stages of growth preserved the initial interface morphology. Due to the large differences in Al and Ni diffusivities, the porosity formation occurred for both types of clads. Faster consumption of Al3Ni phase at the expense of the growing Al3Ni2 phase, characterized by strong crystallographic texture, has been observed only for the weld obtained at low detonation velocity. As a result of the extended annealing time, the disintegration of the bond occurred due to crack propagation located at the A1050/Al3Ni2 interface.

Highlights

The designing and manufacturing of metallic multilayered composites are one of the challenges of modern materials engineering
The interface of E2000 presented in Figure 3a consists of melted areas along the whole length of the bonding zone, and it is flatter in comparison to the E2800 (Figure 4 in current work and Figure 2a in [40]), where the obvious wavy morphology prevailed
As there seems to be no consistent tendency of metallic islands formation versus the applied detonation velocity, it may be assumed that this is an individual feature of the specific explosive weld

Summary

Introduction

The designing and manufacturing of metallic multilayered composites are one of the challenges of modern materials engineering. Incompatibility in terms of the sequence of the intermetallic formation is not the case for explosive welding clads, at least for the first stages, because the initial interface has been already formed in extreme conditions of temperature and pressure before bimetallic plates were annealed.

Results

Conclusion