Parallel Tubular Channel Angular Pressing (PTCAP) Processing of the Cu-20.7Zn-2Al Tube.

Mohamed Ibrahim Abd El Aal,Elshafey Ahmed Gadallah

doi:10.3390/ma15041469

Mohamed Ibrahim Abd El Aal, Elshafey Ahmed Gadallah

Open Access

https://doi.org/10.3390/ma15041469

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Abstract

Commercial Al-brass tube was successfully processed by Parallel Tubular Channel Angular Pressing (PTCAP) in 2 passes under an imposed strain of 1.49 per pass. The effect of the number of PTCAP passes on the microstructure and the mechanical properties (hardness, tensile, and wear mass loss) of the Al-brass tubes was fully investigated. The average grain size of the as-received tube decreased to 1.28 μm after up to two passes of PTCAP with a mixture of ultrafine grain (UFG) and coarse grain (CG). The annealed tubes’ tensile strength and Vickers hardness increased by 237.65% and 175.6%, respectively, after two passes. In addition, a ductile fracture occurred with a clear necking. The fracture surface morphology indicated an apparent decrease in dimple size after PTCAP processing, combined with a decrease in ductility. Moreover, the wear mass loss decreased with increasing number of PTCAP passes due to the decrease in the grain size, and the increase of the hardness of the tubes was enhanced after PTCAP processing.

Highlights

The effect of severe plastic deformation (SPD) on improving the mechanical and physical properties of bulk metal and metal alloy samples has been the motivation of many recent works [1,2,3]
The SPD of sheets has been performed by accumulative roll bonding (ARB) [12], equal-channel angular rolling (ECAR) [13], and constrained groove pressing (CGP) [14]
SPD is used in tube specimen processing using spin extrusion (SE) [15,16], high-pressure tube twisting (HPTT) [17], and accumulative spin-bonding (ASB)

Summary

Introduction

The effect of severe plastic deformation (SPD) on improving the mechanical and physical properties of bulk metal and metal alloy samples has been the motivation of many recent works [1,2,3]. The production of UFG tubes has been carried out using accumulative spin-bonding (ASB) [18], equal-channel angular pressing of tubular (ECAP-tube) [19,20], and tube channel pressing (TCP) [21]. These techniques have a high cost and entail great difficulty in setting up the dies, while suffering from the limitation of producing low inhomogeneous microstructures. Further investigations on the effect of using a combination of smaller die angles with a slower pressing rate in order to produce a mixture of fine- and coarse-grain Cu and Al-brass tubes with high mechanical properties are still required. To explore the influence of grain refinement after PTCAP of the Cu-20.7Zn-2Al tubes on their mechanical properties

Mechanical and Microstructure Properties

Wear Properties

Findings

Wear Mass Loss