Abstract
In this work, a small amount of Nb has been added in a Zr52Cu42.5Al5.5 bulk metallic glass, and a Zr52Cu42Al5.5Nb0.5 bulk metallic glass composite with dual-amorphous and nanocrystal structures has been developed for the first time. This in situ formed bulk metallic glass composite has a larger room compressive plasticity of above 13% than that of the Zr52Cu42.5Al5.5 bulk metallic glass. The excellent plasticity of the bulk metallic glass composite is attributed to the phase-separated matrix with micro-nanocrystal and the nanocrystallization during the deforming process. This work may give a new sight into design bulk metallic glass composites and the underlying mechanism for deformation.
Highlights
Bulk metallic glasses (BMGs) have potential applications because of its many excellent properties, such as high strength, large elastic strain limit, good corrosion resistance [1,2,3,4,5], etc
52Cu42Al5.5Nb0.5 BMG composite had a larger plastic deformation of about 13.1% than that of Zr52 Cu42.5 Al5.5 BMG at 0.5%. These results show that the plasticity at a room temperature of that of Zr52Cu42.5Al5.5 BMG at 0.5%
Zr52Cu42.5Al5.5 BMG and what is the plasticity originated from? In order to understand the intrinsic mechanism for the pronounced plasticity of the Zr52Cu42Al5.5Nb0.5 BMG composite, we focused mechanism theafter pronounced of the ZrFirstly, Nb0.5toBMG
Summary
Bulk metallic glasses (BMGs) have potential applications because of its many excellent properties, such as high strength, large elastic strain limit, good corrosion resistance [1,2,3,4,5], etc. Among the methods [10,11] that have been put forward to enhance the plasticity in existence, phase separation and in suit formed bulk metallic glass (BMG) composite are the two most widely used Both of them are based on the introduction of structural heterogeneity in BMGs. some phase-separated alloys with large wavelengths such as the plasticity of Zr46 Cu42 Al7 Y5 BMG exhibits less than 2% [12]. The bulk metallic glass composite has a dual-amorphous matrix with partial nanocrystals, and the room compressive plasticity can reach above 13%. The deformation of this composite has been studied, which implies the nanocrystallization around shear bands (SBs) occurs during the deformation process. 10, 1158 implies the nanocrystallization around shear bands (SBs) occurs during 2 the of 8 deformation process
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