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Title: Amorphous martensite in β-Ti alloys
Authors: Zhang, L.Zhang, H.Ren, X.Eckert, J.Wang, Y.Zhu, Z.Gemming, T.Pauly, S.
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Issue Date: 2018
Published in: Nature Communications Vol. 9 (2018), No. 1
Publisher: London : Nature Publishing Group
Abstract: Martensitic transformations originate from a rigidity instability, which causes a crystal to change its lattice in a displacive manner. Here, we report that the martensitic transformation on cooling in Ti-Zr-Cu-Fe alloys yields an amorphous phase instead. Metastable β-Ti partially transforms into an intragranular amorphous phase due to local lattice shear and distortion. The lenticular amorphous plates, which very much resemble α′/α″ martensite in conventional Ti alloys, have a well-defined orientation relationship with the surrounding β-Ti crystal. The present solid-state amorphization process is reversible, largely cooling rate independent and constitutes a rare case of congruent inverse melting. The observed combination of elastic softening and local lattice shear, thus, is the unifying mechanism underlying both martensitic transformations and catastrophic (inverse) melting. Not only do we reveal an alternative mechanism for solid-state amorphization but also establish an explicit experimental link between martensitic transformations and catastrophic melting.
Keywords: beta titanium alloy; copper; iron; titanium; unclassified drug; zirconium; Article; cooling; crystallization; differential scanning calorimetry; electron diffraction; electron energy loss spectroscopy; energy dispersive X ray spectroscopy; Fourier transformation; heating; selected area electron diffraction; solid state; transition temperature; transmission electron microscopy; X ray diffraction
DDC: 530
License: CC BY 4.0 Unported
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