Nanoscale Structural Evolution and Anomalous Mechanical Response of Nanoglasses by Cryogenic Thermal Cycling

Abstract

One of the central themes in the amorphous materials research is to understand the nanoscale structural responses to mechanical and thermal agitations, the decoding of which is expected to provide new insights into the complex amorphous structural-property relationship. For common metallic glasses, their inherent atomic structural inhomogeneities can be rejuvenated and amplified by cryogenic thermal cycling, thus can be decoded from their responses to mechanical and thermal agitations. Here, we reported an anomalous mechanical response of a new kind of metallic glass (nanoglass) with nanoscale interface structures to cryogenic thermal cycling. As compared to those metallic glasses by liquid quenching, the ScFe (at. %) nanoglass exhibits a decrease in the Young's modulus but a significant increase in the yield strength after cryogenic cycling treatments. The abnormal mechanical property change can be attributed to the complex atomic rearrangements at the short- and medium- range orders due to the intrinsic nonuniformity of the nanoglass architecture. The present work gives a new route for designing high-performance metallic glassy materials by manipulating their atomic structures and helps for understanding the complex atomic structure-property relationship in amorphous materials.

RETRACTED ARTICLE: Effects of Primary Stored Energy on Relaxation Behavior of High Entropy Bulk Metallic Glasses Under Compressive Elastostatic Loading

“…4, the fraction volume of loose packing structures for S1, S2 and S3 is 9.9%, 12.9% and 13.4%, respectively. Previous works showed that the fraction volume of loose structure for conventional metallic glasses is in the range of 20-25%, which is much higher than our results [35,36]. It is suggested that when an element is dominant in the atomic structure and several minor added elements are in the chemical compositions, the disordering phenomenon can be intensified in the microstructure.…”

“…P 0 is the loading rate, t c defines the relaxation time and, G 1 and G 2 introduce the modulus of dense-and loose-packing structures, respectively. Fitting the mentioned equation and the load-displacement curve, it is possible to attain G 1 and G 2 data and subsequently, the volume fraction of loose packing structures can be achieved as follows [35]:…”

Elastic Moduli of Nanoglasses and Melt-Spun Metallic Glasses by Ultrasonic Time-of-Flight Measurements

“…(2)- (5). The data given in ref [32] and n depends on the grain morphology and pore geometry of the material and is determined to n & 3 [25], indicating that pores are interconnected. We assume a & 1 thus implying that ordered packing of pores is absent [28,29].…”

Cryogenic Dependent Energy Manipulation in Nonthermally Coupled Levels for Multicolor Upconversion Luminescence

“…Cryogenics, a branch of physics that could cause intriguing changes in the properties of matter, play an important role in aerospace, biological engineering, infrared detectors, and energy technology, such as cryogenics can reduce the thermal noise to obtain reliable signals, decrease the reaction rate to capture the details of the reaction process in chemical research, and can be used for the simulation requirements of space exploration equipment. − These fields require precise control of the appropriate temperature to meet different application requirements, where the cryogenic sensor is a fundamental measurement that can accurately reflect temperature changes in cryogenic environments. − Conventional cryogenic thermometer generally require physical contact and thermal transmission, which are not suitable in many situations due to the limitation of spatial resolution, sensitivity and accuracy of detection . Efforts based on upconversion (UC) luminescence can provide a noncontact temperature measurement method, exhibiting fast response speed, high spatial resolution, and wide measurement range, − which could provide the possibility for designing reliable cryogenic sensors owing to the diversification thermal response mechanisms of rare earth ions.…”