J. Mater. Sci. Technol. ›› 2020, Vol. 49: 35-41.DOI: 10.1016/j.jmst.2020.02.001
• Research Article • Previous Articles Next Articles
Yanke Liua, Yulong Caia, Chenggang Tianb, Guoliang Zhangb, Guoming Hanc, Shihua Fua,d, Chuanyong Cuib,*(), Qingchuan Zhanga,*()
Received:
2018-11-09
Revised:
2019-09-28
Accepted:
2019-12-26
Published:
2020-07-15
Online:
2020-07-17
Contact:
Chuanyong Cui,Qingchuan Zhang
Yanke Liu, Yulong Cai, Chenggang Tian, Guoliang Zhang, Guoming Han, Shihua Fu, Chuanyong Cui, Qingchuan Zhang. Experimental investigation of a Portevin-Le Chatelier band in Ni‒Co-based superalloys in relation to γʹ precipitates at 500 ℃[J]. J. Mater. Sci. Technol., 2020, 49: 35-41.
Fig. 1. Experimental setup of tensile test and DIC observation systems, which consist of a tensile machine (RGM-4050), a heating furnace, a temperature controlling box, a camera with a standard 50 mm lens, a light source, a trigger collector, and a high-performance computer for acquiring images and performing post-processing procedures.
Fig. 2. Optical micrographs showing the grain sizes of the microstructures comprising the different γ′ content alloys: (a) 5% and (b) 30 %. The micrographs were captured by Vitt: DM1000-M.
Fig. 3. (a) and (b) TEM images revealing the γ′ precipitate morphologies of the 5% and 30 % γ′ alloys; (c) chemical components of the matrix; (d) mean radius and area fraction of the γ′ precipitates.
Fig. 4. Sketches of the macroscopic fracture observed for the (a) 5% and (d) 30 % γ′ alloys and the fractographs of the (b, c) 5% and (e, f) 30 % γ′ alloys.
Fig. 5. Engineering stress-strain curves of the 5% and 30 % γ′ alloys. The insets show the distributions of the serration amplitude, which indicate the peak-shaped distribution.
Fig. 7. DIC strain maps of 5% and 30 % γ′ alloys at different stages of loading: (a), (c), and (e) correspond to the 5% γ′ content alloy at 0.1, 0.2, and 0.4, respectively; (b) and (d) correspond to the 30 % γ′ content alloy at 0.1 and 0.2, respectively; (f) shows the corresponding strain distribution. The three red points (P1, P2, P3) in (a) and (b) are used in the analysis of the local strain rate evolutions shown in Fig. 9.
Fig. 8. Variation in the PLC band width and the band inclination with loading procedure and γ′ content. A value of ~34 pixel/mm was obtained for the correspondence between the actual dimension and the acquired image.
Fig. 9. Evolutions of the local strain rate corresponding to three selected points (as shown in Fig. 7(a-b)) of different γ′ content alloys: (a) 5% γ′ alloy, (b) 30 % γ′ alloy. For clarity, these curves are separated vertically by strain rate intervals of 1.2 × 10-2 s-1.
Fig. 11. Special propagation of PLC bands in the 30 % γ′ alloy: the (a) strain maps obtained for the tensile direction and (b) strain evolution corresponding to the center lines.
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