Martensitic transformations in NiMnAl β phase alloys

R. Kainuma; H. Nakano; K. Ishida

doi:10.1007/BF02595663

Martensitic transformations in NiMnAl β phase alloys

R. Kainuma, H. Nakano, K. Ishida

ENG - Metallurgy

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

92 Citations (Scopus)

Abstract

Martensitic transformation characteristics in a wide range of alloy compositions in the NiMnAl system have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results indicate that while the NiMnAl alloys with relatively high Al and Mn contents transform martensitically to either the 14M(7R) or the 10M phase with a long-period stacking-order structure, those with low Al or Mn contents transform to the L1₀(3R:2M) structure. The M_s temperature and the c/a ratio of the L1₀ martensite increase with decreasing Al or Mn content. In the Ni-30Mn-20Al alloy, typical premartensite microstructures, such as needlelike, modulated, and tweed structures, are observed and it is also found that a distorted B2 structure is formed as an intermediate phase prior to transformation to the 10M martensite.

Original language	English
Pages (from-to)	4153-4162
Number of pages	10
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	27
Issue number	12
DOIs	https://doi.org/10.1007/BF02595663
Publication status	Published - 1996 Jan 1

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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abstract = "Martensitic transformation characteristics in a wide range of alloy compositions in the NiMnAl system have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results indicate that while the NiMnAl alloys with relatively high Al and Mn contents transform martensitically to either the 14M(7R) or the 10M phase with a long-period stacking-order structure, those with low Al or Mn contents transform to the L10(3R:2M) structure. The Ms temperature and the c/a ratio of the L10 martensite increase with decreasing Al or Mn content. In the Ni-30Mn-20Al alloy, typical premartensite microstructures, such as needlelike, modulated, and tweed structures, are observed and it is also found that a distorted B2 structure is formed as an intermediate phase prior to transformation to the 10M martensite.",

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T1 - Martensitic transformations in NiMnAl β phase alloys

AU - Kainuma, R.

AU - Nakano, H.

AU - Ishida, K.

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N2 - Martensitic transformation characteristics in a wide range of alloy compositions in the NiMnAl system have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results indicate that while the NiMnAl alloys with relatively high Al and Mn contents transform martensitically to either the 14M(7R) or the 10M phase with a long-period stacking-order structure, those with low Al or Mn contents transform to the L10(3R:2M) structure. The Ms temperature and the c/a ratio of the L10 martensite increase with decreasing Al or Mn content. In the Ni-30Mn-20Al alloy, typical premartensite microstructures, such as needlelike, modulated, and tweed structures, are observed and it is also found that a distorted B2 structure is formed as an intermediate phase prior to transformation to the 10M martensite.

AB - Martensitic transformation characteristics in a wide range of alloy compositions in the NiMnAl system have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results indicate that while the NiMnAl alloys with relatively high Al and Mn contents transform martensitically to either the 14M(7R) or the 10M phase with a long-period stacking-order structure, those with low Al or Mn contents transform to the L10(3R:2M) structure. The Ms temperature and the c/a ratio of the L10 martensite increase with decreasing Al or Mn content. In the Ni-30Mn-20Al alloy, typical premartensite microstructures, such as needlelike, modulated, and tweed structures, are observed and it is also found that a distorted B2 structure is formed as an intermediate phase prior to transformation to the 10M martensite.

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Martensitic transformations in NiMnAl β phase alloys

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