Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Martensitic phase transformation and shape memory properties of the as-cast NiCuTiHf and NiCuTiHfZr alloys. / Baradari, Sadjad; Resnina, Natalia; Belyaev, Sergey; Nili-Ahmadabadi, Mahmoud.
в: Journal of Alloys and Compounds, Том 888, 161534, 25.12.2021.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Martensitic phase transformation and shape memory properties of the as-cast NiCuTiHf and NiCuTiHfZr alloys
AU - Baradari, Sadjad
AU - Resnina, Natalia
AU - Belyaev, Sergey
AU - Nili-Ahmadabadi, Mahmoud
N1 - Publisher Copyright: © 2021 Elsevier B.V.
PY - 2021/12/25
Y1 - 2021/12/25
N2 - This study investigates the structure, martensitic phase transformation behavior, and shape memory properties of the quaternary Ni44.8Cu5Ti45.2Hf5 and quinary Ni44.8Cu5Ti40.2Hf5Zr5 and Ni45.5Cu5Ti39.5Hf5Zr5 shape memory alloys (SMAs) in the as-cast state. The alloys exhibited a dual-phase microstructure com-posed of matrix phase (austenite or martensite depending on the chemical composition) and Ti2Ni-type phase. The experimental results revealed that the alloys underwent a one-step B2 -> B19' transformation. The Ni44.8Cu5Ti45.2Hf5 alloy showed a maximum shape memory strain of 6.2% with a recovery ratio of 81% upon thermal cycling under a tensile stress of 300 MPa, while in the Ni44.8Cu5Ti40.2Hf5Zr5 alloy, a maximum shape memory strain of about 5% was obtained under 500 MPa with a recovery ratio of 86%. The as-cast Ni44.8Cu5Ti45.2Hf5 alloy showed superelastic response with 0.3% maximum transformation strain at 125 degrees C. On the other hand, the Ni44.8Cu5Ti45.2Hf5 alloy showed the best superelastic response at 65 degrees C with a recoverable strain of about 1.9%. Two-way shape memory strains of 0.8% and 3.3% were obtained in the Ni44.8Cu5Ti45.2Hf5 and Ni44.8Cu5Ti40.2Hf5Zr5 alloys, respectively. The Ni45.5Cu5Ti39.5Hf5Zr5 alloy, however, did not reveal the shape memory effect. Results obtained from low-temperature X-ray diffraction (XRD) analysis indicated that the B2 -> B19' transformation was considerably suppressed in this alloy and the volume fraction of B19' martensite did not exceed 8% even at an ultra-low temperature of - 150 degrees C. (C) 2021 Elsevier B.V. All rights reserved.
AB - This study investigates the structure, martensitic phase transformation behavior, and shape memory properties of the quaternary Ni44.8Cu5Ti45.2Hf5 and quinary Ni44.8Cu5Ti40.2Hf5Zr5 and Ni45.5Cu5Ti39.5Hf5Zr5 shape memory alloys (SMAs) in the as-cast state. The alloys exhibited a dual-phase microstructure com-posed of matrix phase (austenite or martensite depending on the chemical composition) and Ti2Ni-type phase. The experimental results revealed that the alloys underwent a one-step B2 -> B19' transformation. The Ni44.8Cu5Ti45.2Hf5 alloy showed a maximum shape memory strain of 6.2% with a recovery ratio of 81% upon thermal cycling under a tensile stress of 300 MPa, while in the Ni44.8Cu5Ti40.2Hf5Zr5 alloy, a maximum shape memory strain of about 5% was obtained under 500 MPa with a recovery ratio of 86%. The as-cast Ni44.8Cu5Ti45.2Hf5 alloy showed superelastic response with 0.3% maximum transformation strain at 125 degrees C. On the other hand, the Ni44.8Cu5Ti45.2Hf5 alloy showed the best superelastic response at 65 degrees C with a recoverable strain of about 1.9%. Two-way shape memory strains of 0.8% and 3.3% were obtained in the Ni44.8Cu5Ti45.2Hf5 and Ni44.8Cu5Ti40.2Hf5Zr5 alloys, respectively. The Ni45.5Cu5Ti39.5Hf5Zr5 alloy, however, did not reveal the shape memory effect. Results obtained from low-temperature X-ray diffraction (XRD) analysis indicated that the B2 -> B19' transformation was considerably suppressed in this alloy and the volume fraction of B19' martensite did not exceed 8% even at an ultra-low temperature of - 150 degrees C. (C) 2021 Elsevier B.V. All rights reserved.
KW - Martensitic phase transformation
KW - Shape memory alloys (SMAs)
KW - Shape memory strain
KW - Superelasticity
KW - Two-way shape memory effect
KW - MECHANICAL-PROPERTIES
KW - CYCLIC REVERSIBILITY
KW - WIDE HYSTERESIS
KW - TEMPERATURES
KW - ZR
KW - COLD
KW - MICROSTRUCTURE
KW - BEHAVIORS
KW - HF
UR - http://www.scopus.com/inward/record.url?scp=85112774853&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2021.161534
DO - 10.1016/j.jallcom.2021.161534
M3 - Article
AN - SCOPUS:85112774853
VL - 888
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 161534
ER -
ID: 85050071