Effect of Microstructure Refinement on Surface Morphology and Dynamic Mechanical Properties of W-Cu Alloys.

Fei Ding,Qidong Wang,Jinglian Fan,Pengfei Li,Liqiang Cao,Jun Li

doi:10.3390/ma14164615

Fei Ding, Qidong Wang + Show 4 more

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https://doi.org/10.3390/ma14164615

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Abstract

Two ultrafine-grained W-Cu alloys and two coarse-grained W-Cu alloys were prepared to study the effect of tungsten grain refinement on the interface characteristics between coating and W-Cu alloys. The experimental results show that in the coarse-grained W-Cu alloys, the tungsten phase near the surface is easy to form pits and cracks during impact loading, while the fine-grained tungsten alloy is not prone to this phenomenon. Simulations show that refining tungsten grains can not only reduce the impact absorption energy, but also increase the contact area of tungsten and copper phases, thereby reducing the fracture probability of tungsten phases and improving the dynamic mechanical properties of the W-Cu alloys under impact loading. The tested results show that the shear strength of gold studs on the coating is increased by about 33%, after grain refinement for the W-Cu alloys.

Highlights

IntroductionTungsten (W)–copper (Cu) composite combines the excellent physical properties of W and CuTungsten (W)–copper (Cu). The rigid skeleton structure of W provides good mechanical properties and low thermal expansion coefficient, while the network structure of Cu offers excellent thermal conductivity and electrical conductivity [1,2,3]
Mechanical Properties of W-CuTungsten (W)–copper (Cu)Tungsten (W)–copper (Cu) composite combines the excellent physical properties of W and Cu
After the W-Cu alloy is deformed by rolling (Figure 1c,d), the tungsten particles are mostly elongated along the rolling horizontal direction, and the maximum length of the elongated tungsten grains is more than 20 μm

Summary

Introduction

Tungsten (W)–copper (Cu) composite combines the excellent physical properties of W and Cu. The rigid skeleton structure of W provides good mechanical properties and low thermal expansion coefficient, while the network structure of Cu offers excellent thermal conductivity and electrical conductivity [1,2,3]. The infiltration of porous-sintered tungsten skeleton by liquid copper is one of the most common methods to form W–Cu composites [6,7,8]. Other methods used to fabricate W-Cu composites include thermo-mechanical process [9,10,11], spark plasma sintering [12], and liquid phase sintering [13,14,15]. Refinement of W grains is an effective way to improve mechanical properties of the W-Cu alloys [16,17,18,19]

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Conclusion