Characterization of Shock Wave Damages in Explosion Welded Mo/Cu Clads

Pradeep Kumar Parchuri,Kazuyuki Hokamoto,Hajime Yamamoto,Akihisa Mori,Shota Kotegawa,Kazuhiro Ito,Shigeru Tanaka

doi:10.3390/met11030501

Pradeep Kumar Parchuri, Kazuyuki Hokamoto + Show 5 more

Open Access

https://doi.org/10.3390/met11030501

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Journal: Metals	Publication Date: Mar 18, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Osaka University, Kumamoto University, Sojo University

Abstract

The shock wave damage during explosive welding has not been reported in a flyer Mo plate of the Mo/Cu clads. However, it would be an inevitable problem in group VI elements. This study was aimed to characterize the shock wave damage in the Mo plate, that is less brittle than a W plate, of explosive welded Mo/Cu clads. Cladding at low horizontal collision velocities leading to high collision angles was expected to enhance the shock wave damage, and the clads resulted in less elongation in bending tests. On the other hand, in the clads obtained at high horizontal collision velocities (HCVs) with low collision angles, their bending elongation increased significantly. The shock wave damage penetrated from the surface of a Mo plate to the Mo/Cu interface, and thus reducing thickness of a Mo plate of bending specimens increased bending plastic strain. The shock wave damage is associated with kinetic energy imparted to the flyer Mo plate, and thus loss of kinetic energy due to formation of an intermediate layer at the interface and reducing thickness of a flyer Mo plate would be very helpful for decrease of shock wave damage.

Highlights

The dissimilar Mo/Cu clads can be potential materials in applications such as heat sinks [1] due to high melting point, superior wear resistance, high sputtering resistance against plasma and low vapor pressure of a Mo plate, and high thermal conductivity of aCu plate
Dissimilar Mo/Cu clads can serve as plasma facing materials in thermonuclear fusion energy applications [2], which is an important source of energy in the near future [3]
Pressure generated at the collision interface exceeds the dynamic yield strength of both the metal plates and metal jets were emitted from the collision interface and the oxide scale and contaminations on the joining surfaces can be scraped off by the jetting; the atoms of the topmost layers of the joining surfaces could come into intimate contact, resulting in formation of strong metallurgical bond [16]

Summary

Introduction

The dissimilar Mo/Cu clads can be potential materials in applications such as heat sinks [1] due to high melting point, superior wear resistance, high sputtering resistance against plasma and low vapor pressure of a Mo plate, and high thermal conductivity of aCu plate. The dissimilar Mo/Cu clads can be potential materials in applications such as heat sinks [1] due to high melting point, superior wear resistance, high sputtering resistance against plasma and low vapor pressure of a Mo plate, and high thermal conductivity of a. Dissimilar Mo/Cu clads can serve as plasma facing materials in thermonuclear fusion energy applications [2], which is an important source of energy in the near future [3]. Large differences in the thermal and physical properties of Mo and Cu (Table 1 [4]) make it difficult to join them using conventional fusion welding techniques [1]. Diffusion bonding technique could produce high strength Mo/Cu joints, the Ni-interlayer usage was essential [5,6,7]. Pressure generated at the collision interface exceeds the dynamic yield strength of both the metal plates and metal jets were emitted from the collision interface and the oxide scale and contaminations on the joining surfaces can be scraped off by the jetting; the atoms of the topmost layers of the joining surfaces could come into intimate contact, resulting in formation of strong metallurgical bond [16]

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