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

doi:10.1016/j.scriptamat.2022.114841

IMR OpenIR

	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
	Xu, Shuai 1,2; Reid, Mark 3; Lin, Junpin 2; Liang, Yongfeng 2; Yang, Liang 4; Zhang, Jinhu 4; Liss, Klaus-Dieter 1,5
通讯作者	Xu, Shuai(dr.shuaixu@gmail.com) ; Lin, Junpin(linjunpin@ustb.edu.cn) ; Liss, Klaus-Dieter(kdl@gtiit.edu.cn)
	2022-10-01
发表期刊	SCRIPTA MATERIALIA
ISSN	1359-6462
卷号	219 页码:6
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.
关键词	In-situ neutron diffraction Phase transformation Crystal structure Structure prototype
资助者	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
收录类别	SCI
语种	英语
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
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000885958300007
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/176888
专题	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.