Effect of CNTs on Activation Volume and Mobile Dislocation Exhaustion Rate of CNTs/Al under Compression Loading

doi:10.1007/s40195-022-01463-x

Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (1): 127-132.DOI: 10.1007/s40195-022-01463-x

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Effect of CNTs on Activation Volume and Mobile Dislocation Exhaustion Rate of CNTs/Al under Compression Loading

Minjie Wang¹, Jianghua Shen¹^,²^,^*(), Biao Chen³, Umeda Junko⁴, Katsuyoshi Kondoh⁴, Yulong Li⁵^,⁶^,^*()

¹School of Aeronautics, Northwestern Polytechnical University, Xi’an 710000, China
²Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application, Xi’an 710000, China
³School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710000, China
⁴Joining and Welding Research Institute, Osaka University,11-1 Mihogaoka, Osaka 567-0047, Japan
⁵School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710000, China
⁶Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications, Xi’an 710000, China

Received:2022-05-27 Revised:2022-06-29 Accepted:2022-07-19 Online:2023-01-10 Published:2022-11-18
Contact: * Jianghua Shen,j.shen@nwpu.edu.cn; Yulong Li,liyulong@nwpu.edu.cn

Abstract

Abstract:

In this study, stress relaxation compression tests were performed to investigate the strain rate sensitivity, activation volume and mobile dislocations in carbon nanotubes/aluminum (CNTs/Al) composites. The results reveal that, with the addition of CNTs, the strain rate sensitivity of CNTs/Al increased. Meanwhile, a smaller V^* of CNTs/Al compared with pure Al was attributed mainly to the CNT-Al interfaces and partly to the increased forest dislocations cutting activities in grain interior, which was related to the tendency of short ranges order formation during plastic deformation. The incorporation of CNTs also improved the dislocation storage capability and reduced the dislocation velocity, leading to a lower mobile dislocation exhaustion rate.

Key words: Metal matrix composites, Carbon nanotubes, Strain rate sensitivity, Activation volume, Dislocations exhaustion

Minjie Wang, Jianghua Shen, Biao Chen, Umeda Junko, Katsuyoshi Kondoh, Yulong Li. Effect of CNTs on Activation Volume and Mobile Dislocation Exhaustion Rate of CNTs/Al under Compression Loading[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(1): 127-132.

Figures/Tables 4

Fig. 1 Grain structures for a pure Al and b CNTs/Al; c grain size histograms of samples; d TEM bright field of CNTs/Al; (e) typical CNT-Al interface

Fig. 2 Typical stress relaxation curves of a pure Al and b CNTs/Al, the inset showing the corresponding compressive stress-strain curve; c fitting of the first relaxation cycle of pure Al according to Eq. (2), giving the apparent activation volume Vap and time constant c; d evolution of mobile dislocation density of pure Al and CNTs/Al with relaxation cycles

Table 1 Comparison of the microscopic deformation parameters for pure Al and CNTs/Al

	$\varepsilon$	$\dot{\varepsilon }$(s⁻¹)	m	V_ap/b³	V^/b³*	H (MPa)
Pure Al	0.025	0.0005	0.0097 ± 0.0008	161 ± 10	140 ± 2	450
2 wt% CNTs/Al	0.025	0.0005	0.012 ± 0.001	98 ± 8	77 ± 6	1350

Fig. 3 Post-loading kernel average misorientation of a pure Al and b CNTs/Al; c typical TEM microstructure of CNTs/Al after SRM; d schematic illustration of dislocation distribution of pure Al and CNTs/Al after SRM

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Effect of CNTs on Activation Volume and Mobile Dislocation Exhaustion Rate of CNTs/Al under Compression Loading

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