| The crystal structure and transformations of the omicron phase O in the Ti-Al-Nb system and on the ambiguity of its subvariants O1 and O2 | |
| Xu, Shuai1,2; Reid, Mark3; Lin, Junpin2; Liang, Yongfeng2; Yang, Liang4; Zhang, Jinhu4; Liss, Klaus-Dieter1,5 | |
| Corresponding Author | Xu, Shuai(dr.shuaixu@gmail.com) ; Lin, Junpin(linjunpin@ustb.edu.cn) ; Liss, Klaus-Dieter(kdl@gtiit.edu.cn) |
| 2022-10-01 | |
| Source Publication | SCRIPTA MATERIALIA
 |
| ISSN | 1359-6462 |
| Volume | 219Pages:6 |
| Abstract | Omicron, O-Ti2NbAl alloys have been under continuous development for more than 40 years as potential materials for the gas turbine engine; however, the crystal structure and phase transformations are still unclear. In this work, we clarified the crystal structure, atom positions and phase transformations of the O phase by in-situ neutron diffraction and high-temperature X-ray diffraction methods. From room temperature to the vanishing temperature of the O phase, the latter exposes a C m c m structure, with Ti and Nb atoms tending to respectively occupy the 8g and 4c(2) positions, but with a certain disorder, introducing an order parameter. The phase transformation sequences of Ti-24.8Al-24.3Nb alloy are O(975 degrees C) -> beta(o) + O(997.5 degrees C) -> B-o (1165.5 degrees C) -> beta. Moreover, we have proven that a distinction of the omicron subvariants 01 and 02 is crystallographic nonsense as O1 must equal to alpha 2 of P 6(3)/m m c structure, and Ti2NbAl is a prototype structure by itself. |
| Keyword | Omicron Ti2NbAl phase In-situ neutron diffraction Phase transformation Crystal structure Structure prototype |
| Funding Organization | State Key Laboratory of Advanced Metals and Materials ; National Natural Science Foundation of China ; Creative Research Groups of China |
| DOI | 10.1016/j.scriptamat.2022.114841 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | State Key Laboratory of Advanced Metals and Materials[2020-ZD04] ; National Natural Science Foundation of China[51831001] ; Creative Research Groups of China[51921001] |
| WOS Research Area | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000833358200007 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/174630 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Xu, Shuai; Lin, Junpin; Liss, Klaus-Dieter |
| Affiliation | 1.Guangdong Technion Israel Inst Technol, Mat Sci & Engn Dept, Shantou 515063, Guangdong, Peoples R China 2.Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China 3.Australian Nucl Sci & Technol Org, Lucas Heights 2234, Australia 4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 5.Guangdong Technion Israel Inst Technol, Guangdong Prov Key Lab Mat & Technol Energy Conve, Shantou 515063, Guangdong, Peoples R China |
| Recommended Citation GB/T 7714 | Xu, Shuai,Reid, Mark,Lin, Junpin,et al. The crystal structure and transformations of the omicron phase O in the Ti-Al-Nb system and on the ambiguity of its subvariants O1 and O2[J]. SCRIPTA MATERIALIA,2022,219:6. |
| APA | Xu, Shuai.,Reid, Mark.,Lin, Junpin.,Liang, Yongfeng.,Yang, Liang.,...&Liss, Klaus-Dieter.(2022).The crystal structure and transformations of the omicron phase O in the Ti-Al-Nb system and on the ambiguity of its subvariants O1 and O2.SCRIPTA MATERIALIA,219,6. |
| MLA | Xu, Shuai,et al."The crystal structure and transformations of the omicron phase O in the Ti-Al-Nb system and on the ambiguity of its subvariants O1 and O2".SCRIPTA MATERIALIA 219(2022):6. |
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