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Origin of rubber-like behaviour in metal alloys

Nature volume 389, pages 579–582 (1997)Cite this article

Abstract

Since 1932 it has been known that a number of ordered alloys show an unusual kind of deformation behaviour1,2,3. These alloys (including Au–Cd, Au–Cu–Zn, Cu–Zn–Al, Cu–Al–Ni)4,5,6,7,8, after being aged for some time in a martensitic state (the low-symmetry phase of a diffusionless transformation), can be deformed like a soft and pseudo-elastic rubber (with a recoverable strain as large as a few per cent). Accompanying martensite ageing is the development of martensite stabilization9 (increase in the temperature of reverse transformation to the parent state), the avoidance of which is important in actuator applications of the shape-memory effect29, (which these alloys also generally exhibit. The origin of this rubber-like behaviour and of the ageing effect has remained unclear10,11,12,13,14,15,16,17. Here we show that this behaviour does not involve a change in the degree of long-range order, but is instead due to an atomic rearrangement within the same sublattice of the imperfectly ordered alloy during martensite ageing. This process is driven by a general tendency for the equilibrium symmetry of the short-range order configuration of lattice imperfections to conform to the symmetry of the lattice. This principle not only explains all the observed aspects of the rubber-like behaviour and the ageing effect in both ordered and disordered alloys, but may also further our understanding of some diffusion phenomena in other crystalline materials.

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Figure 1
Figure 2: Mechanism of rubber-like behaviour and the martensite stabilization phenomenon.
Figure 3: X-ray profiles of (242) Bragg reflection of single-crystal Au525Cd47.5 martensite after ageing for a short (1.15 h) and a long (28.45 h) time21.

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Acknowledgements

We thank T. Suzuki, T. Ohba, H. Horiuchi, M. Kogachi and Y. Murakami for helpful discussions and critical reading the manuscript; T. Ishii for technical assistance; and T. Ohba for allowing us to use his published diffraction data. The work was supported by a Grant-in-Aid for Scientific Research on Priority Area of Phase Transformations (1997–1999) from the Ministry of Education, Science and Culture of Japan. X.R. is a recipient of a JSPS Fellowship.

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  1. Institute of Materials Science, University of Tsukuba, Tsukuba, 305, Ibaraki, Japan

    Xiaobing Ren & Kazuhiro Otsuka

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  1. Xiaobing Ren
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Correspondence to Kazuhiro Otsuka.

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Ren, X., Otsuka, K. Origin of rubber-like behaviour in metal alloys. Nature 389, 579–582 (1997). https://doi.org/10.1038/39277

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