Portevin-Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni-25Mo-8Cr alloy during high-temperature tensile deformation

doi:10.1007/s12598-024-02908-1

IMR OpenIR

	Portevin-Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni-25Mo-8Cr alloy during high-temperature tensile deformation
	Yang, Ming 1,6; Luo, Tao 1; Lei, Lei 2,3; Jiang, Yun 1; Wang, Pan-Zhi 4; Xu, Fa-Hong 5
通讯作者	Lei, Lei(leileiacute@126.com) ; Jiang, Yun(j_yun7907@163.com)
	2024-07-27
发表期刊	RARE METALS
ISSN	1001-0521
页码	17
摘要	Uniaxial tensile testing explored the Portevin-Le Chatelier (PLC) effect in nickel-based superalloys featuring high Mo/Cr mass ratios, focusing on the influence of variations in the initial microstructure on the deformation behavior at room and elevated temperatures. Experimental results indicated that the PLC effect was observed solely in the high-temperature tensile curves. However, the deformation mechanisms and characteristics of the PLC effect varied with different initial microstructures. Solid solution (SS) and over-aged (OA) samples exhibited C-type serrations, while under-aged (UA) and peak-aged (PA) specimens, featuring short- and long-range ordered phases, respectively, exhibited A + B type serrations in their tensile curves. Microstructural evolution from the SS to the UA, PA and OA states changed their stacking fault energy (SFE), leading to a sequential transformation in the plastic deformation mechanisms during high-temperature tensile deformation: stacking fault (SF) -> nanotwin -> microtwin -> SF. C-type serrations in the SS samples were associated with high solute-atom contents and SF formation. The PLC effects in the UA and PA samples were predominantly caused by solute atom pinning dislocations. Although precipitates and twins were not the primary drivers of the PLC effect, they impeded dislocation migration, exacerbated solute-atom segregation and enhanced dislocation pinning, generating A + B-shaped serrations. In the OA specimens, precipitated phases induced interfacial mismatch under thermal-force coupling. SF shearing of the precipitated phase and subsequent re-dissolution facilitated the formation of C-type serrations, whose PLC effect was induced by the combined action of dynamic strain aging (DSA), SFs of the matrix and diffusion-controlled pseudo-locking mechanisms.
关键词	Ni-Mo-Cr superalloy Pt2Mo precipitates PLC effect Deformation mechanism
资助者	Guizhou Provincial Key Technology RD Program
DOI	10.1007/s12598-024-02908-1
收录类别	SCI
语种	英语
资助项目	Guizhou Provincial Key Technology RD Program[[2022] 052]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001279131900004
出版者	NONFERROUS METALS SOC CHINA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/188688
专题	中国科学院金属研究所
通讯作者	Lei, Lei; Jiang, Yun
作者单位	1.Guizhou Univ, Sch Mat & Met, Guiyang 550025, Peoples R China 2.Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China 3.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China 4.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 5.Guizhou Special Equipment Inspection & Testing Ins, Guiyang 550025, Peoples R China 6.Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Yang, Ming,Luo, Tao,Lei, Lei,et al. Portevin-Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni-25Mo-8Cr alloy during high-temperature tensile deformation[J]. RARE METALS,2024:17.
APA	Yang, Ming,Luo, Tao,Lei, Lei,Jiang, Yun,Wang, Pan-Zhi,&Xu, Fa-Hong.(2024).Portevin-Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni-25Mo-8Cr alloy during high-temperature tensile deformation.RARE METALS,17.
MLA	Yang, Ming,et al."Portevin-Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni-25Mo-8Cr alloy during high-temperature tensile deformation".RARE METALS (2024):17.