Stress-Induced Martensitic Transformation of Zr50Cu25Ni10Co15Nanocrystals Embedded in an Amorphous Matrix

Abstract

Abstract:

The stress induced martensitic phase transformation of spherical ZrCu nanocrystals embedded in an amorphous matrix was studied in this paper. Microstructural observations revealed that the martensitic transformation of the nanocrystal was hindered by the surrounding amorphous coating. The existence of two-step transformation from the austenite phase (B2) to the base structure martensite (B19') and finally to the most stable superstructure martensite (Cm) was also demonstrated. The Cm martensite with (021) type I twinning symmetrically accommodation was surrounded by the B19' martensite with dislocation morphologies.

Key words: Nanocrystals, ZrCu, Martensitic phase transformation, Shape memory, Transmission electron microscopy

Gao W.H.,Yi X.Y.,Meng X.L.,Song G.,Cai W.,Zhao L.C.. Stress-Induced Martensitic Transformation of Zr50Cu25Ni10Co15Nanocrystals Embedded in an Amorphous Matrix[J]. J. Mater. Sci. Technol., 2017, 33(3): 276-280.

Figures/Tables 5

Fig. 1. Microstructure of the as-spun Zr50Cu25Ni10Co15 ribbons for the different rotation speed (a-d, 4000?rpm; e-h, 3500?rpm). (a, e) XRD patterns, (b, c, f, g) TEM morphologies (b) the dark field (DF) image; (c) bright field (BF) image) and (d, h) high-resolution transmission electron microscopy (HRTEM) image of the B2 phase.

Fig. 2. (a) DSC curves of the as-spun Zr50Cu25Ni10Co15 ribbons under different heating rates; (b) Kissinger's plot for the above DSC data.

Fig. 3. Tensile stress-strain curves of the as-spun Zr50Cu25Ni10Co15 ribbons with (a) 3500?rpm, (b) 4000?rpm; XRD patterns after tensile test of the as-spun Zr50Cu25Ni10Co15 ribbons with (c) 3500?rpm, (d) 4000?rpm.

Fig.4. SEM tensile fracture morphologies of Zr50Cu25Ni10Co15 ribbons: (a) completely amorphous; (b) amorphous matrix with crystal phase.

Fig.5. (a) TEM image of the as-spun Zr50Cu25Ni10Co15 ribbons with 3500?rpm after tensile, (b) dislocations surrounded the accommodation martensite, (c) enlarged image of the accommodation martensite with the corresponding EDPs, (d) the HRTEM of B19' phase and the FFT of dislocations.

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