Abstract
In this work, surface mechanical attrition treatment (SMAT) was employed to rejuvenate ZrCuAlNi bulk metallic glass (BMG) plate. Differential scanning calorimetry (DSC), atomic force microscopy (AFM) and nanoindentation analyses were carried out to evaluate stored energy and micro-mechanical properties of treated BMGs. According to DSC results, 10 min SMAT process increased the stored energy of BMG plates up to 50%. AFM analysis showed that the structural rejuvenation occurred in the bulk of samples and just a slight rejuvenation gradient was detected from the front to the back side of BMG plates. Nanoindentation analysis indicated that the structural rejuvenation is consistent with anelastic strain induced under the SMAT process. It was also found that an optimum treatment time is needed for maximum rejuvenation in the BMGs. This event is due to the fact that the glassy structure is able to store a critical anelastic strain, which leads to a saturated condition in rejuvenation.
Highlights
Due to their outstanding mechanical and physical properties, bulk metallic glasses (BMGs) have received tremendous research interest for developing novel engineering structures[1,2,3]
This result clearly indicates that the surface mechanical attrition treatment (SMAT) process leads to the increased stored energy, especially at the treatment time of 5 and 10 min; at the higher treatment times (15 min), rejuvenation degree decreases, which means that an optimum treatment time is needed for maximum structural rejuvenation in the BMG
Under the SMAT process, it was found that an average slight gradient of 8% for dynamic modulus exists in the thickness of our BMG plate, which means that the SMAT process is able to induce structural rejuvenation bulk glassy alloys
Summary
Due to their outstanding mechanical and physical properties, bulk metallic glasses (BMGs) have received tremendous research interest for developing novel engineering structures[1,2,3]. Practical application of BMGs have been hindered in many cases, owing to their inhomogeneous plastic deformation[4,5]. To tackle this challenge, several methods such as chemical composition tuning, composite making or rejuvenating processes have been proposed[6,7,8,9,10]. Thanks to many rejuvenation processes proposed by researchers, mechanical treatments in the range of elastic and anelastic deformation are identified effective methods, in which no shape changes occur and there is no limit in dimensions of samples. It was reported that the compressive loading is effective near the range of yield strength. Samavatian et al.[18,19,20] reported that the tensile
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