Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 931, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167507
Keywords
Bcc-magnesium alloy; Martensitic transformation; Superelasticity; TRIP effect
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This study investigated the TRIP effect in Mg-Sc alloys with a beta single-phase structure. The results showed that the presence of a hexagonal close-packed phase led to a strain-induced martensitic transformation, resulting in superior ductility. The Mg-Sc alloys exhibited high fracture strain and ultimate tensile strength, overcoming the limitations of conventional Mg alloys.
This study investigated the transformation-induced plasticity (TRIP) effect in Mg-Sc alloys with beta single-phase (body-centered cubic) structure. A Mg-19.8 at% Sc alloy showed fracture strain of similar to 53 % accompanied by necking propagation with increasing the tensile strain at room temperature. An X-ray diffraction analysis and transmission electron microscopy observations confirmed the existence of a hexagonal close-packed phase beside the beta matrix phase during and after the tensile test; this indicates a strain-induced martensitic transformation, i.e., the TRIP effect induced superior ductility. Moreover, the study revealed a threshold Sc content of similar to 19.5 at% Sc at which the deformation behavior at room temperature changes from super -elasticity to TRIP. The TRIP Mg-Sc alloys exhibited fracture strain from 45 % to 66 % and ultimate tensile strength (UTS) above 220 MPa to overcome the tradeoff between the fracture strain and UTS of conventional Mg alloys.(c) 2022 Elsevier B.V. All rights reserved.
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