Invar-type effect induced by cold-rolling deformation in shape memory alloys

R. Kainuma; J. J. Wang; T. Omori; Y. Sutou; K. Ishida

doi:10.1063/1.1485118

Invar-type effect induced by cold-rolling deformation in shape memory alloys

R. Kainuma, J. J. Wang, T. Omori, Y. Sutou, K. Ishida

Tohoku University

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

52 Citations (Scopus)

Abstract

Since the discovery of Fe-Ni alloys showing low thermal expansion (LTE) in 1896, many Invar alloys have been developed based on magnetovolume effect where negative thermal expansion is induced by magnetic transformation. Herein, we show that the control of stress-induced martensitic transformation due to cold working of the Cu-Zn-Al polycrystalline alloy results in the LTE. This type of LTE material is easily fabricated by conventional cold rolling, and the coefficient of thermal expansion in the range from about 0 to 32×10 ^-6K^-1 can be obtained by controlling the reduction ratio. The LTE effect due to the present method can also be obtained for other shape memory (SM) alloys such as Ni-Ti, Cu-Mn-Al and Ni-Al base alloys, which have high potential for various practical applications.

Original language	English
Pages (from-to)	4348-4350
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	23
DOIs	https://doi.org/10.1063/1.1485118
Publication status	Published - 2002 Jun 10

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AU - Kainuma, R.

AU - Wang, J. J.

AU - Omori, T.

AU - Sutou, Y.

AU - Ishida, K.

PY - 2002/6/10

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AB - Since the discovery of Fe-Ni alloys showing low thermal expansion (LTE) in 1896, many Invar alloys have been developed based on magnetovolume effect where negative thermal expansion is induced by magnetic transformation. Herein, we show that the control of stress-induced martensitic transformation due to cold working of the Cu-Zn-Al polycrystalline alloy results in the LTE. This type of LTE material is easily fabricated by conventional cold rolling, and the coefficient of thermal expansion in the range from about 0 to 32×10 -6K-1 can be obtained by controlling the reduction ratio. The LTE effect due to the present method can also be obtained for other shape memory (SM) alloys such as Ni-Ti, Cu-Mn-Al and Ni-Al base alloys, which have high potential for various practical applications.

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Invar-type effect induced by cold-rolling deformation in shape memory alloys

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