Abstract
Remarkable tensile ductility was first obtained in an in-situ Ti-based bulk metallic glass (BMG) composite at cryogenic temperature (77 K). The novel cryogenic tensile plasticity is related to the effective accommodation of ductile body-centered cubic dendrites at 77 K, characteristic of the prevailing slip bands and dislocations, as well as lattice disorder, which can effectively hinder the propagation of critical shear bands. The greatly increased yield strength of dendrites contributes to the high yield strength of composite at 77 K. A trend of stronger softening is observed at low temperature, and a criterion is proposed to understand the softening behavior. The current research could also provide a guidance to the promising cryogenic application of these new advanced BMG composites.
Highlights
Remarkable tensile ductility was first obtained in an in-situ Ti-based bulk metallic glass (BMG) composite at cryogenic temperature (77 K)
Alleviating the catastrophic failure in bulk metallic glasses (BMGs) caused by the highly-localized shear banding deformation is still full of challenges[1]
The main reason lies on the ductile to brittle transition of body-centered cubic (BCC) dendrites at low temperature, which leads to the formation of premature cracks
Summary
Remarkable tensile ductility was first obtained in an in-situ Ti-based bulk metallic glass (BMG) composite at cryogenic temperature (77 K). With the ever increasing demand of advanced materials for extending their applications, the exploration of deformation behaviors to some extreme conditions other than ambient or quasi-static condition is becoming more and more important. It’s useful and necessary to investigate their performance at cryogenic temperatures In this regard, studies on the cryogenic properties of these in-situ BMG composites will be beneficial to understanding the underlying mechanisms, and in favor of extending their potential applications and designing new BMG composites for cryogenic applications. It’s the first time that a remarkable tensile plasticity was obtained in in-situ Ti-based BMG composites at cryogenic temperature. The detailed micromechanisms are explored via the synchrotron X-ray diffraction and high-resolution transmission electron microscopy (TEM)
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