|
|||||
|
|
High temperature deformation and fracture mechanisms in a dendritic Ni3Al alloy |
|
| Affiliation: | 1. Department of Agricultural Biology, National Institute of Agricultural Science and Technology, R.D.A., Wanju-gun 565-850, Republic of Korea;2. College of Natural Resources and Life Science, Dong-A University, Busan 604-714, Republic of Korea;3. College of Agricultural and Life Science, Chonnam National University, Gwangju 500-757, Republic of Korea;1. Institute of Plant Sciences, Agricultural Research Organization, Rishon LeZion 7505101, Israel;2. The Interdisciplinary Department of Social Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel;3. Department of Biology, Levinsky College of Education, 15 Shoshana Persitz St., Tel Aviv 6937808, Israel;4. Herbarium, Steinhardt Museum of Natural History, 12 Klausner St., Tel Aviv 6901127, Israel;5. Department of Biology/Chemistry, Botany Section, University of Osnabrueck, Barbarastrasse 11, Osnabrück 49076, Germany |
| Abstract: | The mechanisms that control high temperature deformation and rupture were studied in a Ni3Al alloy that was thermo-mechanically treated to produce a non-porous dendritic grain structure. Comparisons of data corresponding to the dendritic grain morphology with that for the equiaxed grain structures indicate that the dendritic morphology results in significantly lower creep rates as well as substantially greater times to rupture. Comparison of the data with numerical calculations suggests that this difference in creep strength is due to an inherent resistance to grain boundary sliding by the dendritic grain structure. A constrained cavity growth model was adapted based on microstructural observations to account for cavitation within the dendritic microstructure. The success of the model indicates that rupture time is primarily determined by constrained cavity growth on isolated dendrite boundary segments. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |