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The crystal structure and transformations of the omicron phase ? in the Ti-Al-Nb system and on the ambiguity of its subvariants?1 and?2

文献类型：期刊论文

作者Xu, Shuai1,2; Reid, Mark3; Lin, Junpin2; Liang, Yongfeng2; Yang, Liang4; Zhang, Jinhu4; Liss, Klaus-Dieter1,5
刊名SCRIPTA MATERIALIA
出版日期2022-10-01
卷号219页码:6
ISSN号1359-6462
关键词In-situ neutron diffraction Phase transformation Crystal structure Structure prototype
DOI10.1016/j.scriptamat.2022.114841
通讯作者Xu, Shuai(dr.shuaixu@gmail.com) ; Lin, Junpin(linjunpin@ustb.edu.cn) ; Liss, Klaus-Dieter(kdl@gtiit.edu.cn)
英文摘要Omicron, Omicron-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 Omicron phase by in-situ neutron diffraction and high-temperature X-ray diffraction methods. From room temperature to the vanishing temperature of the Omicron phase, the latter exposes a C m c m structure, with Ti and Nb atoms tending to respectively occupy the 8g and 4c2 positions, but with a certain disorder, introducing an order parameter. The phase transformation sequences of Ti-24.8Al-24.3Nb alloy are Omicron(975 degrees C) -> beta o + Omicron(997.5 degrees C) -> beta o(1165.5 degrees C) -> beta. Moreover, we have proven that a distinction of the omicron subvariants Omicron 1 and Omicron 2 is crystallographic nonsense as Omicron 1 must equal to alpha 2 of P 63/m m c structure, and Ti2NbAl is a prototype structure by itself.
资助项目State Key Laboratory of Advanced Metals and Materials[2020-ZD04] ; National Natural Science Foundation of China[51831001] ; Creative Research Groups of China[51921001]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000885958300007
资助机构State Key Laboratory of Advanced Metals and Materials ; National Natural Science Foundation of China ; Creative Research Groups of China
源URL[http://ir.imr.ac.cn/handle/321006/176887]  
专题金属研究所_中国科学院金属研究所
通讯作者Xu, Shuai; Lin, Junpin; Liss, Klaus-Dieter
作者单位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 Conver, Shantou 515063, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Shuai,Reid, Mark,Lin, Junpin,et al. The crystal structure and transformations of the omicron phase ? in the Ti-Al-Nb system and on the ambiguity of its subvariants?1 and?2[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 ? in the Ti-Al-Nb system and on the ambiguity of its subvariants?1 and?2.SCRIPTA MATERIALIA,219,6.
MLA Xu, Shuai,et al."The crystal structure and transformations of the omicron phase ? in the Ti-Al-Nb system and on the ambiguity of its subvariants?1 and?2".SCRIPTA MATERIALIA 219(2022):6.

入库方式： OAI收割

来源：金属研究所

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