Effects of carbon nanotubes on twin and texture evolution of magnesium matrix composite during compression process

Journal Article · Sun Jul 15 00:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.05.008· OSTI ID:22832984

Du, W.B., E-mail: [e-mail]; Han, G.Q., E-mail: [e-mail]; Li, S.B., E-mail: [e-mail]; Liu, K., E-mail: [e-mail]; Wang, Z.H., E-mail: [e-mail]; Du, X., E-mail: [e-mail] ^[1]

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1. College of Materials Science and Engineering, Beijing University of Technology, No. 100 Pingleyuan, Beijing 100124 (China)

Highlights: • The CNTs existing at grain boundaries lead to stress concentration, and stimulate the formation of twins. • Crystal rotation and non-basal slip alternately dominate the deformation of the CNTs/Mg composite. • The texture changes from random texture to strong basal texture, strong non-basal texture at the three corresponding stages. • Crystal rotation and non-basal slip system are the main toughening mechanisms of the CNTs/Mg composite. - Abstract: A compression test is performed to investigate the effects of carbon nanotubes (CNTs) on twin and texture evolution of the 1.0 wt.% CNTs reinforced magnesium matrix (CNTs/Mg) composite. The compression process consists of elastic, yield and hardening stages, and the number of twin significantly increases at the yield stage. During the compression process, the crystal rotation and non-basal slip caused by twin shear alternately dominate the deformation of the 1.0 wt.% CNTs/Mg composite. The CNTs existing at grain boundaries lead to stress concentration, and the stress concentration stimulates the formation of twins at the yield stage. The formed twins interact with dislocations, result in crystal rotation and promotion of the non-basal slip system at the hardening stage under the effect of twin shear, thus, improve the toughness of the CNTs/Mg composite.

• OSTI ID: 22832984
• Journal Information: Materials Characterization, Vol. 141; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CARBON NANOTUBES
COMPRESSION
CONCENTRATION RATIO
CRYSTALS
DEFORMATION
DISLOCATIONS
GRAIN BOUNDARIES
HARDENING
MAGNESIUM COMPOUNDS
MATRIX MATERIALS
SLIP
STRESSES
TEXTURE