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Superplasticity in An Organic Crystal

Penelitian - Researcher report the finding of superplasticity in organic single crystals of N,N-dimethyl-4-nitroaniline. The crystal deforms over 500% of strain rate along the 100 direction based on a multi-layer slipping mechanism while superelastic behavior, or spontaneous shape recovery, is confirmed along the 201 direction.

It is noteworthy that the crystal keeps single crystallinity during the deformation according to single crystal X-ray diffraction measurements. Actually, the deformed crystal shows superelasticity which is caused by mechanically-induced twinning of a single crystal.

Penelitian Superplasticity in An Organic Crystal

Deformability is important for the simplification of production processes as well as usage of solid materials. Deformation is classified into two categories: elastic and plastic deformations, the latter is valuable for material processing.

A remarkable degree of plastic deformability makes the molding processing quick and easy, and such processing is applied to metals and organic polymers that gain a certain ductility and malleability by heating.

However, it has limited application to low-ductility solids, especially those bearing high crystallinity, capable of solid functions based on the structural uniformity of crystalline materials. There is therefore potential demand for another class of plasticity offered by crystalline materials.

Up to now, superplasticity has been found as extreme plastic deformability, which drastically improves the workability of hard-to-work materials such as high-strength aluminum alloys and titanium alloys. Application of superplasticity to material molding has been developed in the field of metallurgy.

In organic materials, molding processing methods for stiff and hard-to-work crystalline polymers have been developed according to the properties of individual polymers. Common crystalline materials, particularly single crystals, least deserve useful plasticity, in the common view.



For this reason, less attention has been paid to the plasticity in organic crystalline solids for a long time. Recently, however, much focus has been placed on U- and S-shaped plastic curving of organic single crystals comprised of aromatic molecules.

Mechanical plastic bending of organic single crystals has been confirmed as one of the classes of diffusion-less plasticity in chemistry, i.e., organoferroelasticity and organosuperelasticity, where superplastic deformability in organic crystals has been missing until now.

Journal : Satoshi Takamizawa et al. Superplasticity in an organic crystal, Nature Communications, 28 September 2018, DOI:10.1038/s41467-018-06431-7

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