Fatigue properties of binary Ti-Ta metal-metal composite with lamellar microstructure

Abstract

Binary metal-metal composites are promising for advanced applications. In general, the interface between adjacent metals may have a great influence on generation and propagation of fatigue cracks. However, limited research has been devoted to investigating the fatigue properties of laminated metal-metal composites. Here, we fabricated a laminated Ti-Ta metal-metal composite through powder metallurgy method, followed by hot deformation subsequently. The fatigue life and the fracture surfaces under different alternating stresses were investigated systematically. The results reveal that the fatigue strength of the Ti-Ta metal-metal composite is 450 MPa, significantly surpassing that of pure Ti. The Ta area presents the fatigue striation characteristics while the Ti area shows the cleavage fracture inside the fatigue stable propagation region. Besides, the interfaces between Ti and Ta areas could restrict the crack growth and/or change the direction of crack propagation. Owing to the direction of crack propagation changing constantly, the fatigue fracture surfaces present a “step-like” microstructure, which is first reported in laminated metal-metal composite. This work provides a novel model for fatigue crack propagation in laminated metal-metal composite.

Keywords

metal-metal composite / alloy Ti-Ta / powder metallurgy / fatigue properties / life prediction / microstructure

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