TY - JOUR
T1 - Adjustable room temperature deformation behavior of Mg–Sc alloy
T2 - From superelasticity to slip deformation via TRIP effect
AU - Yamagishi, Keisuke
AU - Ogawa, Yukiko
AU - Ando, Daisuke
AU - Sutou, Yuji
N1 - Funding Information:
This work was supported by JSPS KAKENHI [Grant Numbers 21J12146 , 18H01691 ]; and Adaptable and Seamless Technology transfer Program through Target-driven R＆D (A-STEP) from Japan Science and Technology Agency (JST) [Grant Number JPMJTR20TJ ].
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/10
Y1 - 2023/1/10
N2 - This study investigated the transformation-induced plasticity (TRIP) effect in Mg–Sc alloys with β single-phase (body-centered cubic) structure. A Mg-19.8 at% Sc alloy showed fracture strain of ∼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 β 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 ∼19.5 at% Sc at which the deformation behavior at room temperature changes from superelasticity 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.
AB - This study investigated the transformation-induced plasticity (TRIP) effect in Mg–Sc alloys with β single-phase (body-centered cubic) structure. A Mg-19.8 at% Sc alloy showed fracture strain of ∼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 β 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 ∼19.5 at% Sc at which the deformation behavior at room temperature changes from superelasticity 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.
KW - Bcc-magnesium alloy
KW - Martensitic transformation
KW - Superelasticity
KW - TRIP effect
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U2 - 10.1016/j.jallcom.2022.167507
DO - 10.1016/j.jallcom.2022.167507
M3 - Article
AN - SCOPUS:85139871537
VL - 931
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 167507
ER -