Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion
| Autor: | Shunsuke Tamai, Shoichi Kikuchi, Takao Kawai, Yoshikazu Nakai, Sophie Gourdet, Hiroki Kurita |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
titanium alloy Whiskers titanium boride 02 engineering and technology lcsh:Technology 01 natural sciences Article Crack closure Hot isostatic pressing 0103 physical sciences crack closure General Materials Science Composite material lcsh:Microscopy Stress intensity factor lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T Titanium alloy Fracture mechanics 021001 nanoscience & nanotechnology fracture mechanics lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics Extrusion fatigue lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 Intensity (heat transfer) |
| Zdroj: | Materials Volume 12 Issue 22 Materials, Vol 12, Iss 22, p 3685 (2019) |
| ISSN: | 1996-1944 |
| Popis: | TiB-reinforced Ti-3Al-2.5V matrix composites, in which TiB whiskers are oriented parallel to the direction of heat extrusion, were fabricated via mechanical alloying and hot isostatic pressing (HIP). To investigate the near-threshold fatigue crack propagation in TiB-reinforced Ti-3Al-2.5V matrix composites, stress intensity factor K-decreasing tests were conducted for disk-shaped compact specimens having two different orientations of TiB whiskers at force ratios from 0.1 to 0.8 under ambient conditions. The crack growth rates, da/dN, for the composites incorporating TiB whiskers oriented perpendicular to the direction of crack growth were constantly lower than those obtained in the case where the orientation was parallel at the same stress intensity range &Delta K, while the threshold stress intensity range, &Delta Kth, was higher. This effect can be explained by the increase in the degree of roughness-induced crack closure resulting from the perpendicular TiB, because fatigue cracks preferentially propagated across the boundaries between the matrix and the TiB in certain regions. In contrast, the effective threshold stress intensity range, &Delta Keff,th, for composites was unaffected by the TiB orientation at low force ratios. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |