NDLI: The Dependence of Portevin–Le Châtelier Effect on the γ′ Precipitates in a Wrought Ni-Base Superalloy

Content Provider	Springer Nature Link
Author	Wang, Xinguang Han, Guoming Cui, Chuanyong Guan, Shuai Jin, Tao Sun, Xiaofeng Hu, Zhuangqi
Copyright Year	2016
Abstract	The dependence of Portevin–Le Châtelier (PLC) effect on the γ′ precipitates of the Nimonic 263 alloy in different microstructural conditions has been studied by analyzing the parameters of the tensile curves and the deformation mechanisms. It is shown that the γ′ precipitates with different sizes, edge-to-edge interprecipitate distance, and areal number density are obtained by altering the aging time. It is demonstrated that when the mean size of the γ′ precipitates is less than 28 nm (aging less than 25 hours), the deformation mechanisms are dominated by APB-coupled a/2〈101〉 dislocations shearing the small γ′ precipitates and the slip bands continuously cutting the γ and γ′ phases. When the γ′ size is between 28 and 45 nm (aging time between 25 and 50 hours), the deformation mechanism is controlled by the APB-coupled a/2〈101〉 dislocations shearing the small γ′ precipitates, the a/6〈112〉 Shockley partial dislocation continuously shearing the γ and γ′ phases combined with matrix dislocations by-passing the γ′ precipitates; If the γ′ size over 45 nm (aging time more than 50 hours), Orowan by-passing becomes the main deformation mechanism. Moreover, with increasing the aging time, the critical plastic strain for the onset of the PLC effect increases and reaches a maximum after aging for 50 hours, and then gradually decreases. At last, the dependence of critical plastic strain on the deformation mechanisms is well explained by the elementary incremental strain (γ). The precipitation process of the γ′ phase can directly influence the PLC effect by changing the interactions among solutes atoms, mobile dislocations, and forest dislocations.
Starting Page	5994
Ending Page	6003
Page Count	10
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	47
Issue Number	12
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-08-15
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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