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Abstract

As cast ingot of the polycrystalline shape memory Ni_53·6Mn_27·1Ga_19·3 alloy was composed of columnar and equiaxed grains. Dilatation characteristics of the samples with columnar grains were studied in the temperature range of 25–370°C and compared with the dilatation characteristics of the samples with equiaxed grains. The results show that shape memory effect strongly depends on the microstructure. Preferred orientation of crystallites in the columnar structure determines its memory strain. The alloy with columnar structure was also examined after predeformation in compression. Two kinds of strains were found in the predeformed samples. Dilatation characteristics of the non-deformed and predeformed martensite show anomalous behaviour.

Keywords

SHAPE MEMORY ALLOY NIMNGA THERMAL EXPANSION

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References

O'Handley

R. C.

Murray

S. J.

, Marioni

, Nembach

and Allen

S. M.

: J. Appl. Phys., 2000, 87, 4712–4717.

Murray

S. J.

, Marioni

, Tello

P. G.

, Allen

S. M.

and O'Handley

R. C.

: Magn. Magn. Mater., 2001, 226-230, 945–947.

Murray

S. J.

, Marioni

, Allen

S. M.

, O'Handley

R. C.

and Lograsso

T. A.

: Appl. Phys. Lett., 2000, 77, 886–888.

Liang

, Jiang

C. B.

, Xu

H. B.

, Liu

Z. H.

, Zhang

, Cui

Y. T.

.: J. Magn. Magn. Mater., 2004, 268, 29–32.

Oikawa

, Wulff

, Lijima

, Gejima

, Ohmori

and Fujita

: Appl. Phys. Lett., 2001, 79, 3290–3292.

Bennett

J. C.

, Hyatt

C. V.

, Gharghouri

M. A.

, Farrell

, Robertson

, Chen

and Pirge

: Mater. Sci. Eng. A, 2004, A378, 409–414.

Liu

, Huo

Y. Q.

, Zheng

H. X.

and Li

J. G.

: Mater. Lett., 2006,60, 1693–1696.

Badillo

and Beckermann

: Acta Mater., to be published.

Chernenko

V. A.

, Cesari

, Kokorin

V. V.

and Vitenko

N. I.

: Scr. Met. Mater., 1995, 33, 1239–1244.

10.

Chernenko

V. A.

, Pons

, Segui

and Cesari

: Acta Mater., 2002, 50, 53–60.

11.

Jiang

, Liu

, Wang

, Xu

and Xu

: Acta Mater., 2005, 53, 1111–1120.

12.

Glavatska

, Mogylny

, Glavatskiy

and Gavriljuk

: Scr. Mater., 2002, 46, 605.

13.

Warlimont

and Delaey

: ‘Martensitic transformations in copper-silver and gold based alloys'; 1974, Oxford, New York, Toronto, Sydney, Pergamon Press.

14.

Rudajevová

.: J. Alloys Compd, 2007, 430, 153–157.

15.

Otsuka

and Wayman

C. M.

(eds.): ‘Shape memory materials’; 1998, Cambridge, Cambridge University Press.

Thermal expansion characteristic of Ni 53·6 Mn 27·1 Ga 19·3 alloy with columnar structure

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