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Title: Effect of multiaxial forging followed by hot rolling on non-basal planes and its influence on tensile and fracture toughness behaviour of Mg–4Zn–4Gd alloy
Authors: Verma R.
Jayaganthan R.
Nath S.K.
Srinivasan A.
Published in: Materials Science and Engineering A
Abstract: Large true strain (up to ~4.7) through hybrid severe plastic deformation (HSPD) technique was imparted to Mg–4Zn–4Gd alloy, to study its influence on microstructural evolution, fracture toughness and tensile properties in the present work. The tensile and fracture toughness of processed Mg alloy were compared with solutionized bulk Mg alloy. The tensile properties are found to be superior in multiaxially forged followed by repetitive rolled specimen at 723 K compared to ST sample. The key strengthening mechanisms such as microstructural bimodality, coherency of the twin boundaries, and precipitation are characterized in detail, to elucidate the enhancement in hardness (~61%), tensile (~62%), yield (~42%) and elastic-plastic fracture toughness (~40%) properties. These improvements are observed in the optimised thermo-mechanically processed condition “6 pass hot forged followed by 75% repetitive hot rolled (6PF-75R) specimen”. However, high dislocation density observed in 6PF-75R specimen leads to lower the ductility compared to other HSPDed conditions but still found higher than that of the solutionized specimens. The fracture phenomena were also explored through post-deformation processed samples through scanning electron microscopy based fractograph to understand the response of different processed specimens using tension and fracture tests. Various microstructural features such as microshear bands, nano-twinning, slip clusters and especially the effect of continuous dynamic recrystallization upon varying true strain are examined by using high-resolution transmission electron microscopy (HR-TEM) and low angle annular dark field scanning transmission electron microscopy (LAADF-STEM) techniques. Correlation of these features with tensile and fracture behaviour are made with the support of light microscopy and X-ray diffraction techniques.
Citation: Materials Science and Engineering A(2020), 774
Issue Date: 2020
Publisher: Elsevier Ltd
Keywords: Fracture toughness (Jâ… c)
High resolution electron microscopy
Scanning transmission electron microscopy
Ultrafine grain
X-ray diffraction
Dynamic recrystallization
Fracture mechanics
Fracture testing
High resolution electron microscopy
High resolution transmission electron microscopy
Hot rolling
Magnesium alloys
Scanning electron microscopy
X ray diffrac
ISSN: 9215093
Author Scopus IDs: 57195381713
Author Affiliations: Verma, R., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee247 667, India
Jayaganthan, R., Department of Engineering Design, Indian Institute of Technology Madras600 036, India
Nath, S.K., Department of Metal
Corresponding Author: Jayaganthan, R.; Department of Engineering Design, India; email:
Appears in Collections:Journal Publications [MT]

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