Entropy Change during Martensitic Transformation in Ni50-xCoxMn50-yAly Metamagnetic Shape Memory Alloys

Xiao Xu; Wataru Ito; Takeshi Kanomata; Ryosuke Kainuma

doi:10.3390/e16031808

Entropy Change during Martensitic Transformation in Ni_50-xCoxMn_50-yAl_y Metamagnetic Shape Memory Alloys

Xiao Xu, Wataru Ito, Takeshi Kanomata, Ryosuke Kainuma

ENG - Metallurgy

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Specific heat was systematically measured by the heat flow method in Ni_50-xCoxMn_50-yAl_y metamagnetic shape memory alloys near the martensitic transformation temperatures. Martensitic transformation and ferromagnetic-paramagnetic transition for the parent phase were directly observed via the specific heat measurements. On the basis of the experimental results, the entropy change was estimated and it was found to show an abrupt decrease below the Curie temperature. The results were found to be consistent with those of earlier studies on Ni-Co-Mn-Al alloys.

Original language	English
Pages (from-to)	1808-1818
Number of pages	11
Journal	Entropy
Volume	16
Issue number	3
DOIs	https://doi.org/10.3390/e16031808
Publication status	Published - 2014 Mar

Keywords

Entropy change
Kinetic arrest
Martensitic transformation
Metamagnetic shape memory alloy
Ni-Co-Mn-Al
Specific heat
Thermal transformation arrest

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10.3390/e16031808

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title = "Entropy Change during Martensitic Transformation in Ni50-xCoxMn50-yAly Metamagnetic Shape Memory Alloys",

abstract = "Specific heat was systematically measured by the heat flow method in Ni50-xCoxMn50-yAly metamagnetic shape memory alloys near the martensitic transformation temperatures. Martensitic transformation and ferromagnetic-paramagnetic transition for the parent phase were directly observed via the specific heat measurements. On the basis of the experimental results, the entropy change was estimated and it was found to show an abrupt decrease below the Curie temperature. The results were found to be consistent with those of earlier studies on Ni-Co-Mn-Al alloys.",

keywords = "Entropy change, Kinetic arrest, Martensitic transformation, Metamagnetic shape memory alloy, Ni-Co-Mn-Al, Specific heat, Thermal transformation arrest",

author = "Xiao Xu and Wataru Ito and Takeshi Kanomata and Ryosuke Kainuma",

year = "2014",

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language = "English",

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T1 - Entropy Change during Martensitic Transformation in Ni50-xCoxMn50-yAly Metamagnetic Shape Memory Alloys

AU - Xu, Xiao

AU - Ito, Wataru

AU - Kanomata, Takeshi

AU - Kainuma, Ryosuke

PY - 2014/3

Y1 - 2014/3

N2 - Specific heat was systematically measured by the heat flow method in Ni50-xCoxMn50-yAly metamagnetic shape memory alloys near the martensitic transformation temperatures. Martensitic transformation and ferromagnetic-paramagnetic transition for the parent phase were directly observed via the specific heat measurements. On the basis of the experimental results, the entropy change was estimated and it was found to show an abrupt decrease below the Curie temperature. The results were found to be consistent with those of earlier studies on Ni-Co-Mn-Al alloys.

AB - Specific heat was systematically measured by the heat flow method in Ni50-xCoxMn50-yAly metamagnetic shape memory alloys near the martensitic transformation temperatures. Martensitic transformation and ferromagnetic-paramagnetic transition for the parent phase were directly observed via the specific heat measurements. On the basis of the experimental results, the entropy change was estimated and it was found to show an abrupt decrease below the Curie temperature. The results were found to be consistent with those of earlier studies on Ni-Co-Mn-Al alloys.

KW - Entropy change

KW - Kinetic arrest

KW - Martensitic transformation

KW - Metamagnetic shape memory alloy

KW - Ni-Co-Mn-Al

KW - Specific heat

KW - Thermal transformation arrest

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Entropy Change during Martensitic Transformation in Ni_50-xCoxMn_50-yAl_y Metamagnetic Shape Memory Alloys

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Keywords

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