Temperature and Orientation Dependence of Fracture Behavior of Directionally Solidified Duplex-Phase Crystals Composed of Ni3X-Type Intermetallic Compounds |
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| Journal | Materials Science Forum (Volume 512) |
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| Volume | Advanced Structural and Functional Materials Design |
| Edited by | Yukichi Umakoshi and Shinji Fujimoto |
| Pages | 67-72 |
| DOI | 10.4028/www.scientific.net/MSF.512.67 |
| Citation | Koji Hagihara et al., 2006, Materials Science Forum, 512, 67 |
| Online since | April, 2006 |
| Authors | Koji Hagihara, Naoyuki Yokotani, Yukichi Umakoshi |
| Keywords | Fracture Behaviour, Intermetallic, Temperature Dependence, Three Point Bending Test, Toughness |
| Abstract | Fracture behaviors of three directionally solidified (DS) duplex-phase alloys composed of Ni3Nb(D0a)/Ni3Al(L12), Ni6TaAl(D024)/Ni3Al(L12) and Ni3Ti(D024)/Ni3Si(L12) phases, respectively were investigated by three-point bending tests, focusing on temperature and orientation dependence. The temperature-toughness relation showed dissimilar curves depending on alloy. The increasing rate of fracture toughness was the highest in the Ni3Al/Ni3Nb alloy with fine lamellar structure and was the lowest in the Ni3Al/Ni6TaAl alloy with rod-like precipitates. The controlling mechanism for the temperature dependence of fracture behavior of Ni3Al/Ni3Nb alloys was discussed. |
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