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 – N and da/dN – ΔK tests. For comparison...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-12-01
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| Series: | Journal of Science: Advanced Materials and Devices |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468217918301655 |
| _version_ | 1811302897224253440 |
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| author | Mitsuhiro Okayasu Tomoki Shigeoka |
| author_facet | Mitsuhiro Okayasu Tomoki Shigeoka |
| author_sort | Mitsuhiro Okayasu |
| collection | DOAJ |
| description | 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. Keywords: Crack closure, Metallic glass, Titanium, Crack growth, Fatigue failure mechanism |
| first_indexed | 2024-04-13T07:37:11Z |
| format | Article |
| id | doaj.art-94dd049150ff4eaead1fa3760e1f28dc |
| institution | Directory Open Access Journal |
| issn | 2468-2179 |
| language | English |
| last_indexed | 2024-04-13T07:37:11Z |
| publishDate | 2018-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Science: Advanced Materials and Devices |
| spelling | doaj.art-94dd049150ff4eaead1fa3760e1f28dc2022-12-22T02:56:04ZengElsevierJournal of Science: Advanced Materials and Devices2468-21792018-12-0134478484Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloyMitsuhiro Okayasu0Tomoki Shigeoka1Corresponding author. Fax: +81 86 251 8025.; Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, JapanGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, JapanTo 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. Keywords: Crack closure, Metallic glass, Titanium, Crack growth, Fatigue failure mechanismhttp://www.sciencedirect.com/science/article/pii/S2468217918301655 |
| spellingShingle | Mitsuhiro Okayasu Tomoki Shigeoka Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy Journal of Science: Advanced Materials and Devices |
| title | Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy |
| title_full | Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy |
| title_fullStr | Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy |
| title_full_unstemmed | Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy |
| title_short | Fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy |
| title_sort | fatigue properties of a nanocrystalline titanium based bulk metallic glassy alloy |
| url | http://www.sciencedirect.com/science/article/pii/S2468217918301655 |
| work_keys_str_mv | AT mitsuhirookayasu fatiguepropertiesofananocrystallinetitaniumbasedbulkmetallicglassyalloy AT tomokishigeoka fatiguepropertiesofananocrystallinetitaniumbasedbulkmetallicglassyalloy |