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Title: Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass

ORCiD logo [1];  [2];  [3]
  1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena CA 91125 USA
  2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos New Mexico, 87545, United States
  3. Division of Engineering and Applied Science, California Institute of Technology, Pasadena CA 91125 USA
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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Advanced Engineering Materials
Additional Journal Information:
Related Information: CHORUS Timestamp: 2018-02-23 02:22:20; Journal ID: ISSN 1438-1656
Wiley Blackwell (John Wiley & Sons)
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Citation Formats

Thompson, Rachel L., Wang, Yongqiang, and Greer, Julia R. Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass. Germany: N. p., 2018. Web. doi:10.1002/adem.201701055.
Thompson, Rachel L., Wang, Yongqiang, & Greer, Julia R. Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass. Germany. doi:10.1002/adem.201701055.
Thompson, Rachel L., Wang, Yongqiang, and Greer, Julia R. 2018. "Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass". Germany. doi:10.1002/adem.201701055.
title = {Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass},
author = {Thompson, Rachel L. and Wang, Yongqiang and Greer, Julia R.},
abstractNote = {},
doi = {10.1002/adem.201701055},
journal = {Advanced Engineering Materials},
number = ,
volume = ,
place = {Germany},
year = 2018,
month = 2

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on February 22, 2019
Publisher's Accepted Manuscript

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  • By adding 0.5 at. % Cu to the strong but brittle [(Fe{sub 0.5}Co{sub 0.5}){sub 0.75}Si{sub 0.05}B{sub 0.20}]{sub 96}Nb{sub 4} bulk metallic glass, fully amorphous rods with diameters up to 2 mm were obtained. The monolithic samples with 1 mm diameter revealed a fracture strain of 3.80% and a maximum stress of 4143 MPa upon compression, together with a slight work-hardening behavior. SEM micrographs of fractured samples did neither reveal any shear bands on the lateral surface nor the typical vein patterns which characterize ductile fracture. However, some layers appear to have flowed and this phenomenon took place before the brittle final fracture. An estimatemore » of the temperature rise ΔT in the shear plane gives 1039 K, which is large enough to melt a layer of 120 nm. The overall performance and the macroscopic plastic strain depend on the interaction between cleavage-like and viscous flow-like features. Mechanical tests performed in-situ under synchrotron radiation allowed the calculation of the strain tensor components, using the reciprocal-space data and analyzing the shift of the first (the main) and the second broad peak positions in the X-ray diffraction patterns. The results revealed that each atomic shell may have a different stiffness, which may explain the macroscopic compressive plastic deformation. Also, there were no signs of (nano) crystallization induced by the applied stress, but the samples preserve a monolithic amorphous structure until catastrophic failure occurs.« less
  • Irradiation can complicate surgical wound healing, yet little is known of the importance of the time between surgery and irradiation on this process. This study investigated the impact of post-operative irradiation on gain in wound tensile strength in a murine skin model. Irradiation on the same day as wounding or to 2-day-old wounds reduced wound tensile strength. In contrast, postoperative irradiation delivered at 7, 9 and 14 days transiently enhanced wound tensile strength, as measure d 3 but not 4 or 5 weeks later. This effect was independent of the inclusion (hemi-body) or exclusion (skin alone) of the hematopoietic systemmore » in the field of irradiation. Radiation-enhanced wound tensile strength was greater and occurred earlier after higher radiation doses. Even though the effect of irradiation in enhancing wound tensile strength is transitory, it could be important in assisting early wound healing. 14 refs., 3 figs., 1 tab.« less
  • Several new amorphous alloys were obtained in an immiscible Y-Nb system by room temperature 190 keV xenon ion mixing of Y-Nb multilayered films, which were designed to include a sufficient fraction of interfacial atoms and thus possessed a high free energy comparable to that of the amorphous state. In addition, two metastable f.c.c. phases were formed in Y-rich and Nb-rich multilayered films, respectively. The growth kinetics of the f.c.c. phases and their effect on the composition range of amorphization are also discussed. To understand the observed unusual alloying behaviors, a Gibbs free-energy diagram was constructed based on Miedema`s model. Themore » diagram included the free-energy curves of all the involved phases as well as that of the Y-Nb multilayered films including the extra interfacial free energy and thus gave a qualitative and reasonable interpretation to the formation of metastable alloys upon ion mixing. Furthermore, some multilayered films with a sufficient fraction of interfacial atoms were subjected to steady-state thermal annealing, which also resulted in the formation of the Y-Nb amorphous phases, suggesting that alloying in this immiscible system was actually driven by the interfacial free energy.« less
  • No abstract prepared.
  • Bulk metallic glass (BMG) exhibits exceptional mechanical and magnetic properties and therefore have been a subject of extensive research. Partial crystallization or devitrification of BMG results in a novel microstructure, with a large number of nano-scale crystalline precipitates evenly distributed in a glassy matrix. These high density (1023-1024 m3) crystalline precipitates are known to impede the propagation of shear bands and it is tempting to exploit them to improve the mechanical properties of BMG alloys [2-4]. To this end, it is essential to establish the fine-scale structure of the crystalline precipitates. Here, we report an experimental study of a multi-componentmore » BMG alloy, Zr52.5Cu17.9Ni14.6Al10Ti5 [5-11] using a set of complementary experimental techniques: a new wide field of view atom probe [12] equipped with a high repetition pulsed laser and in-situ small angle scattering by high-energy synchrotron x-ray. The new atom probe instrument revealed nano-scale solute partitioning at an unprecedented detail. This level of detail is crucial for understanding the interference peaks observed in small angle x-ray and neutron scattering experiments [8-11], a mystery that has lingered for more than a decade.« less