Amorphous martensite in β-Ti alloys

Long Zhang, Haifeng Zhang (), Xiaobing Ren (), Jürgen Eckert, Yandong Wang, Zhengwang Zhu, Thomas Gemming and Simon Pauly
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Long Zhang: Chinese Academy of Sciences
Haifeng Zhang: Chinese Academy of Sciences
Xiaobing Ren: Xi’an Jiaotong University
Jürgen Eckert: Austrian Academy of Sciences
Yandong Wang: University of Science and Technology Beijing
Zhengwang Zhu: Chinese Academy of Sciences
Thomas Gemming: IFW Dresden, Institute for Complex Materials
Simon Pauly: IFW Dresden, Institute for Complex Materials

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-02961-2

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