Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy
To obtain a better understanding of the fatigue properties and crack growth characteristics of a nanocrystalline titanium based bulk metal glasses (Ti-BMG) made by vacuumed casting process, the fatigue failure mechanisms of Ti-BMG have been investigated via S e N and da/dN e DK tests. For compariso...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019
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| Subjects: | |
| Online Access: | http://repository.vnu.edu.vn/handle/VNU_123/67303 https://doi.org/10.1016/j.jsamd.2018.10.001 |
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| Institution: | Vietnam National University, Hanoi |
| Language: | English |
| Summary: | To obtain a better understanding of the fatigue properties and crack growth characteristics of a nanocrystalline titanium based bulk metal glasses (Ti-BMG) made by vacuumed casting process, the fatigue
failure mechanisms of Ti-BMG have been investigated via S e N and da/dN e DK tests. For comparison,
the crystalline Ti alloy Ti-Al6V4 was also employed. The fatigue strength in the early fatigue stage was
high for Ti-BMG due to the high tensile strength. However, the fatigue strength decreased significantly in
the late fatigue stage. The higher slope of S e N relation was detected for Ti-BMG, which crossed that for
the Ti-Al6V4 sample around 5 103 cycles. In the higher Region II, the fatigue crack growth rate was of
similar level for both Ti-BMG and Ti-Al6V4 due to their similar strain energy. In the lower Region II,
however, the lower crack growth resistance was obtained for Ti-BMG, as compared to Ti-Al6V4. This was
attributed to the high crack driving force for Ti-BMG, caused by the weak roughness-induced crack
closure. Such crack closing characteristics of Ti-BMG were systematically investigated by various
experimental techniques. |
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