Abstract
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 – N and da/dN – ΔK 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 – 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.
| Original language | English |
|---|---|
| Pages (from-to) | 478-484 |
| Number of pages | 7 |
| Journal | Journal of Science: Advanced Materials and Devices |
| Volume | 3 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Dec 1 2018 |
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Keywords
- Crack closure
- Crack growth
- Fatigue failure mechanism
- Metallic glass
- Titanium
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Biomaterials
- Materials Science (miscellaneous)
Cite this
Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy. / Okayasu, Mitsuhiro; Shigeoka, Tomoki.
In: Journal of Science: Advanced Materials and Devices, Vol. 3, No. 4, 01.12.2018, p. 478-484.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy
AU - Okayasu, Mitsuhiro
AU - Shigeoka, Tomoki
PY - 2018/12/1
Y1 - 2018/12/1
N2 - 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 – N and da/dN – ΔK 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 – 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.
AB - 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 – N and da/dN – ΔK 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 – 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.
KW - Crack closure
KW - Crack growth
KW - Fatigue failure mechanism
KW - Metallic glass
KW - Titanium
UR - http://www.scopus.com/inward/record.url?scp=85057238992&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85057238992&partnerID=8YFLogxK
U2 - 10.1016/j.jsamd.2018.10.001
DO - 10.1016/j.jsamd.2018.10.001
M3 - Article
AN - SCOPUS:85057238992
VL - 3
SP - 478
EP - 484
JO - Journal of Science: Advanced Materials and Devices
JF - Journal of Science: Advanced Materials and Devices
SN - 2468-2284
IS - 4
ER -