A high-strength binary Mg-1.2Ce alloy with ultra-fine grains achieved by conventional one-step extrusion during 300-400 °C

doi:10.1016/j.jmrt.2024.05.121

IMR OpenIR

	A high-strength binary Mg-1.2Ce alloy with ultra-fine grains achieved by conventional one-step extrusion during 300-400 °C
	Zhao, Dongqing 1; Zhang, Sha 2; Cheng, Kaiming 1,3; Yang, Fan 1; Yu, Huan 1,3; Liu, Hongtao 1; Zhang, Xinfang 1; Wang, Xitao 1; Yang, Yuansheng 4; Zhou, Jixue 1,3
通讯作者	Zhao, Dongqing(zhaodq@sdas.org) ; Zhou, Jixue(zhoujx@sdas.org)
	2024-05-01
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
ISSN	2238-7854
卷号	30 页码:7697-7708
摘要	Ultra-fine grained magnesium alloys are usually prepared by severe deformation and medium-low temperature deformation. In this work, it has been found that the binary Mg-1.2Ce alloy with the uniform distributed Mg12Ce precipitates smaller than 3 mu m is a good candidate to obtain ultra-fine grains by conventional one-step extrusion at high temperatures. All the three Mg-1.2Ce samples extruded at 300 degrees C, 350 degrees C and 400 degrees C show a bimodal microstructure with high-density dislocations, whose average grain sizes are 1.19 +/- 0.92 mu m, 1.32 +/- 1.30 mu m, and 1.44 +/- 1.33 mu m, respectively. A linear relation of ln(d) = -0.05ln(Z)+1.27 was determined relating the average grain size (d) to the Zener-Hollomon parameter (Z). The alloy extruded at 300 degrees C exhibits an exceptionally high ultimate tensile strength (UTS) of 412.3 +/- 5.3 MPa and yield strength (TYS) of 387.6 +/- 3.2 MPa, but a low elongation after fracture (El) of 4.9 +/- 0.8 %. With the extrusion temperature increasing, the tensile strength gradually decreases. For the 1.2E-400 sample, the TYS and the UTS drop to 347.2 +/- 2.1 MPa and 349.4 +/- 2.8 MPa, while the El increases to a more acceptable value of 12.6 +/- 1.4 %. The microstructure analysis reveals that Ce atoms segregate along grain boundaries and dislocations in the Mg-1.2Ce alloy, which can limit the gliding of GBs or the slipping and climbing of dislocations. Additionally, dislocations can be pinned by Mg12Ce precipitates, thereby also restricting dislocation and grain boundary mobility. Consequently, the dynamic recrystallization (DRX) process is delayed, leading to the formation of a bimodal microstructure.
关键词	Mg-Ce alloy Particle-stimulated nucleation High-density dislocation Segregation
资助者	Shandong Provincial Natural Science Foundation ; National Natural Science Foundation of China ; Youth Innovation and Technology Support Program of Shandong Provincial Colleges and Universities ; Key R & D Program of Shandong Province, China
DOI	10.1016/j.jmrt.2024.05.121
收录类别	SCI
语种	英语
资助项目	Shandong Provincial Natural Science Foundation[ZR2021ME250] ; National Natural Science Foundation of China[52004135] ; Youth Innovation and Technology Support Program of Shandong Provincial Colleges and Universities[2020KJA002] ; Key R & D Program of Shandong Province, China[2021SFGC1001]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001266410400001
出版者	ELSEVIER
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/187869
专题	中国科学院金属研究所
通讯作者	Zhao, Dongqing; Zhou, Jixue
作者单位	1.Qilu Univ Technol, Adv Mat Inst, Shandong Acad Sci, Shandong Prov Key Lab High Strength Lightweight Me, Jinan 250014, Peoples R China 2.Changsha Univ, Coll Mech & Elect Engn, Changsha 410022, Peoples R China 3.Adv Mat Inst, Engn Res Ctr Lightweight Automobiles Magnesium All, Jinan 250014, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Dongqing,Zhang, Sha,Cheng, Kaiming,et al. A high-strength binary Mg-1.2Ce alloy with ultra-fine grains achieved by conventional one-step extrusion during 300-400 °C[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2024,30:7697-7708.
APA	Zhao, Dongqing.,Zhang, Sha.,Cheng, Kaiming.,Yang, Fan.,Yu, Huan.,...&Zhou, Jixue.(2024).A high-strength binary Mg-1.2Ce alloy with ultra-fine grains achieved by conventional one-step extrusion during 300-400 °C.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,30,7697-7708.
MLA	Zhao, Dongqing,et al."A high-strength binary Mg-1.2Ce alloy with ultra-fine grains achieved by conventional one-step extrusion during 300-400 °C".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30(2024):7697-7708.