In situ observation of the tensile deformation and fracture behavior of ti–5al–5mo–5v–1cr–1fe alloy with different microstructures
Materials, ISSN: 1996-1944, Vol: 14, Issue: 19
2021
- 6Citations
- 6Captures
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Metrics Details
- Citations6
- Citation Indexes6
- CrossRef5
- Captures6
- Readers6
Article Description
The plastic deformation processes and fracture behavior of a Ti–5Al–5Mo–5V–1Cr–1Fe alloy with bimodal and lamellar microstructures were studied by room-temperature tensile tests with in situ scanning electron microscopy (SEM) observations. The results indicate that a bimodal microstructure has a lower strength but higher ductility than a lamellar microstructure. For the bimodal microstructure, parallel, deep slip bands (SBs) are first noticed in the primary α (α) phase lying at an angle of about 45 to the direction of the applied tension, while they are first observed in the coarse lath α (α) phase or its interface at grain boundaries (GBs) for the lamellar microstructure. The β matrix undergoes larger plastic deformation than the α phase in the bimodal microstructure before fracture. Microcracks are prone to nucleate at the α/β interface and interconnect, finally causing the fracture of the bimodal microstructure. The plastic deformation is mainly restricted to within the coarse α phase at GBs, which promotes the formation of microcracks and the intergranular fracture of the lamellar microstructure.
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