Using grain boundary irregularity to quantify dynamic recrystallization in ice
文献类型：期刊论文
| 作者 | Fan, Sheng4; Prior, David J.4; Cross, Andrew J.2,3; Goldsby, David L.3; Hager, Travis F.3; Negrini, Marianne4; Qi, Chao1 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 209页码:22 |
| 关键词 | High-temperature deformation Grain boundary irregularity Dynamic recrystallization Grain boundary migration Crystallographic orientation Electron backscatter diffraction |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2021.116810 |
| 英文摘要 | Dynamic recrystallization is an important mechanical weakening mechanism during the deformation of ice, yet we currently lack robust quantitative tools for identifying recrystallized grains in the "migration" recrystallization regime that dominates ice deformation at temperatures close to the ice melting point. Here, we propose grain boundary irregularity as a quantitative means for discriminating between recrystallized (high sphericity, low irregularity) and remnant (low sphericity, high irregularity) grains. To this end, we analysed cryogenic electron backscatter diffraction (cryo-EBSD) data of deformed polycrystalline ice, to quantify dynamic recrystallization using grain boundary irregularity statistics. Grain boundary irregularity has an inverse relationship with a sphericity parameter, Psi, defined as the ratio of grain area and grain perimeter, divided by grain radius in 2-D so that the measurement is grain size independent. Sphericity (Psi) typically decreases with increasing grain size, up to a threshold grain size, above which Psi either plateaus (at temperature, T < -10 degrees C) or increases much more gradually (at T >= 10 degrees C). There is no apparent relationship between grain boundary sphericity and grain c-axis orientation even at very high temperatures (-4 and -5 degrees C), where GBM dominants, suggesting little crystallographic control on the activity of grain boundary migration (GBM). Decreasing sphericity up to the threshold grain size can be explained by newly-formed, small, spherical recrystallized grains growing via strain-induced GBM and thereby developing increasingly irregular grain boundaries. We suggest that the plateau (or gradual decrease) in sphericity at larger sizes represents a population of original grains (i.e., remnant grains) that becomes increasingly irregular (at similar rates) due to the balance between GBM and nucleation. In this interpretation, the threshold grain size represents the largest grain size reached by a growing recrystallized grain by the end of an experiment. Thus, grain boundary irregularity provides a means for discriminating between recrystallized and remnant grains-a capability that is potentially useful for evaluating dynamic recrystallization processes in ice deformed at temperatures close to the melting point. The threshold grain size and experiment duration can be used to calculate the rates of recrystallization and grain size evolution associated with GBM. Grain size evolution rates are similar at high and low temperatures, suggesting similar GBM rates. Previous studies show that grain boundary mobility decreases with decreasing temperature. The driving force of GBM, on the other hand, has a positive correlation with stress, which increases with a decreasing temperature if strain rate remains unchanged. The balance between boundary mobility and driving force is likely the cause of similar GBM rates between high and low temperatures. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| WOS关键词 | SIZE DISTRIBUTIONS ; DEFORMATION MECHANISMS ; FLOW-LAW ; TEMPERATURE ; STRAIN ; STRESS ; CREEP ; QUARTZ ; GROWTH ; SHEAR |
| 资助项目 | NASA fund[NNX15AM69G] ; Royal Society of New Zealand[UOO1116] ; Royal Society of New Zealand[UOO052] ; University of Otago ; Antarctica New Zealand doctoral scholarship |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000641587000001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago ; University of Otago ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago ; University of Otago ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago ; University of Otago ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago ; University of Otago ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101158]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Fan, Sheng |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA 3.Univ Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA 4.Univ Otago, Dept Geol, 360 Leith St, Dunedin, New Zealand |
| 推荐引用方式 GB/T 7714 | Fan, Sheng,Prior, David J.,Cross, Andrew J.,et al. Using grain boundary irregularity to quantify dynamic recrystallization in ice[J]. ACTA MATERIALIA,2021,209:22. |
| APA | Fan, Sheng.,Prior, David J..,Cross, Andrew J..,Goldsby, David L..,Hager, Travis F..,...&Qi, Chao.(2021).Using grain boundary irregularity to quantify dynamic recrystallization in ice.ACTA MATERIALIA,209,22. |
| MLA | Fan, Sheng,et al."Using grain boundary irregularity to quantify dynamic recrystallization in ice".ACTA MATERIALIA 209(2021):22. |
入库方式： OAI收割
来源：地质与地球物理研究所
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