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High temperature fracture behavior of tungsten fiber reinforced copper matrix composites under dynamic compression
Highlights ► Interface strength of the composites was high. ► The composites possessed obvious high temperature softening behavior. ► Damage of the composites occurred in different location, when temperature changed. ► Stacking faults and twins occurred in the composites at 600°C.
Abstract Wf/Cu82Al10Fe4Ni4 composite was fabricated by flow casting method. Dynamic compression tests with strain rate of 1600s−1 at 20°C, 200°C, 400°C and 600°C were finished by means of Split Hopkinson Pressure Bar (SHPB). The results showed that the composites possessed obvious high temperature softening behaviors. The damages of Wf/Cu82Al10Fe4Ni4 composites all occurred within the tungsten fibers when compressed at 20°C, 200°C and 400°C, indicating that the interface strength of the composites was high. While the damages of the composites occurred either in the tungsten fibers or in the matrix at 600°C, in addition, the melt of matrix alloy also occurred. Microstructure of the composites after dynamic compressing at 600°C was analyzed by transmission electron microscope (TEM), observation revealed that there were a lot of high-density dislocations, stacking faults and twins existing in the matrix. It was also found that the precipitated phase in the matrix played the role of the second phase strengthening.
High temperature fracture behavior of tungsten fiber reinforced copper matrix composites under dynamic compression
Highlights ► Interface strength of the composites was high. ► The composites possessed obvious high temperature softening behavior. ► Damage of the composites occurred in different location, when temperature changed. ► Stacking faults and twins occurred in the composites at 600°C.
Abstract Wf/Cu82Al10Fe4Ni4 composite was fabricated by flow casting method. Dynamic compression tests with strain rate of 1600s−1 at 20°C, 200°C, 400°C and 600°C were finished by means of Split Hopkinson Pressure Bar (SHPB). The results showed that the composites possessed obvious high temperature softening behaviors. The damages of Wf/Cu82Al10Fe4Ni4 composites all occurred within the tungsten fibers when compressed at 20°C, 200°C and 400°C, indicating that the interface strength of the composites was high. While the damages of the composites occurred either in the tungsten fibers or in the matrix at 600°C, in addition, the melt of matrix alloy also occurred. Microstructure of the composites after dynamic compressing at 600°C was analyzed by transmission electron microscope (TEM), observation revealed that there were a lot of high-density dislocations, stacking faults and twins existing in the matrix. It was also found that the precipitated phase in the matrix played the role of the second phase strengthening.
High temperature fracture behavior of tungsten fiber reinforced copper matrix composites under dynamic compression
Wu, Z. (author) / Wu, G.H. (author) / Kang, P.C. (author) / Gou, Q. (author) / Chen, G.Q. (author) / Jiang, L.T. (author)
2011-06-02
5 pages
Article (Journal)
Electronic Resource
English
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