Abstract
The strain-rate-dependent plasticity under uniaxial compression at the strain rates of 2 × 10−3, 2 × 10−4 and 2 × 10−5 s−1 in a Pd77.5Cu6Si16.5 alloy is investigated. At different strain rates, the serration events exhibit different amplitudes and time scales. The intersection effects take place obviously, and the loading time is much longer than the relaxation time in the serration event at three strain rates. However, the time intervals between two neighboring serrations lack any time scale, and the elastic energy density displays a power-law distribution at the strain rate of 2 × 10−3 s−1, which means that the self-organized critical (SOC) behavior emerges with increasing strain rates.
Highlights
As a new class of advanced metallic materials, high-entropy alloys (HEAs), with an equiatomic or a near equiatomic composition, have been researched extensively [1,2,3]
When the amorphous alloys yield, the serrated flows prevail until the final fracture, and the flow stress increases with the plastic deformation
One should note that the serration behavior displays obvious different plastic strain before final fracture at different strain rates, suggesting a rate dependence of the shear instability and ductility for Pd-based multicomponent amorphous alloys
Summary
As a new class of advanced metallic materials, high-entropy alloys (HEAs), with an equiatomic or a near equiatomic composition, have been researched extensively [1,2,3]. A new kind of alloy has been developed and named as high-entropy bulk metallic glass (HE-BMG), which has both the features of HEAs for their composition and those of metallic glasses for their noncrystalline structure. These alloys have a potential to open a new research field by utilizing the unique properties of HEAs and bulk metallic glasses (BMGs) in the near future [9,10,11].
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