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Zheng L.-L.,Beijing Institute of Technology | Liu J.-X.,Beijing Institute of Technology | Li S.-K.,Beijing Institute of Technology | Liu S.,Beijing Institute of Technology | And 2 more authors.
Rare Metals | Year: 2016

The W–Cu–Zn alloy with α-brass matrix and low W–W contiguity was prepared by method of electroless copper plating combined with spark plasma sintering (SPS) method. The effects of process and parameters on the microstructure and mechanical properties of the alloy were investigated. The W–Cu–Zn alloy with a relative density of 96 % and a W–W contiguity of about 10 % was prepared by original fine tungsten particles combined with wet mixing method and SPS solid-state sintering method at 800 °C for 10 min. The microstructure analysis shows that Cu–Zn matrix consists of nano-sized α-brass grains, and the main composition is Cu3Zn electride. The nano-sized Cu was coated on the surface of tungsten particles by electroless copper plating method, and the fairly low consolidation temperature and short solid-state sintering time result in the nano-sized matrix phase. The dynamic compressive strength of the W–Cu–Zn alloy achieves to 1000 MPa, but the alloy shows poor ductility due to the formation of the hard and brittle Cu3Zn electrides. The fine-grain strengthening and the solution strengthening of the Cu–Zn matrix phase are responsible for the high Vickers microhardness of about 300 MPa for W–Cu–Zn alloy. © 2015, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.


Dong W.-J.,Beijing Institute of Technology | Liu J.-X.,Beijing Institute of Technology | Cheng X.-W.,Beijing Institute of Technology | Li S.-K.,Beijing Institute of Technology | And 2 more authors.
Rare Metals | Year: 2015

Two kinds of W/Cu double-layer shaped charge liner (SCL) were prepared by chemical vapor deposition (CVD) combined with electroforming technique: A SCL with W inner layer and Cu outer layer, B SCL with Cu inner layer and W outer layer. The penetration properties of A and B SCLs were researched. The results show that the two SCLs can form continuous jet and the tip velocities of A and B jets are 7.4 and 6.3 km·s−1, respectively. The kinetic energy density (5.3 × 1011 J·m−3) of A jet tip increases by 194.4 % compared with that (1.8 × 1011 J·m−3) of B jet tip. B jet, however, exhibits deeper penetration depth at the same experimental conditions. The chemical component and microstructure of the area nearby the ballistic perforation were researched. Component analysis shows that both the jets are formed only from inner layer metal. Microstructure analysis shows that martensite and intermetallic form around ballistic perforation penetrated by A SCL due to the intensive interaction between W jet and steel target. The two kinds of newly formed ultrahard phases also hinder the jet from penetrating target further. As a result of relatively alleviative interaction between Cu jet and target, only solid solution rather than ultrahard phases forms around ballistic perforation penetrated by B SCL. © 2015 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg

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