Effect of beta flecks on mechanical properties of Ti–10V–2Fe–3Al alloy |
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Authors: | W.D. Zeng Y.G. Zhou |
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Affiliation: | College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People's Republic of China |
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Abstract: | The effects of beta flecks on tensile properties and low-cycle fatigue life were investigated at room temperature for Ti–10V–2Fe–3Al alloy. It was found that beta flecks had a significant influence on tensile ductility and low-cycle fatigue life. The greater the volume fraction of beta flecks (PA) or maximum area of beta flecks (Smax), the lower the tensile ductility and low-cycle fatigue life. Extensive scanning electron microscopy (SEM) and light microscopy (LM) observation showed that under tensile load, cracks preferentially nucleated at β grain boundaries of beta flecks, then grew, connected and propagated along grain boundaries to form characteristics of intergranular fracture and quasi-cleavage fracture. While under an alternating load, beta flecks acted as sites for low-cycle fatigue crack nucleation due to inhomogeneous alternating strains between soft GB and aged beta matrix. The presence of beta flecks accelerates both the crack nucleation and early crack propagation. |
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Keywords: | Ti–10V–2Fe–3Al alloy Beta fleck Tensile property Low-cycle fatigue life Intergranular fracture Cleavage fracture |
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