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413 results on '"Pauly, S."'

5. Transformation-mediated Plasticity in CuZr based Metallic Glass Composites: A Quantitative Mechanistic Understanding

Author

Sun, B. A., Song, K. K., Pauly, S., Gararella, P., Liu, C. T., Eckert, J., and Yang, Y.

Subjects
Condensed Matter - Materials Science
Abstract

In this paper, we present a thorough stress analysis of the Cu-Zr metallic-glass composite with embedded B2 particles subject to a martensitic transformation. Within the framework of the Eshelby theory, we are able to explain, in a quantitative manner, (1) the formation of three types of shear bands with distinct morphologies as observed experimentally in the severely deformed Cu-Zr metallic-glass composite and (2) the work hardening ability of the Cu-Zr metallic-glass composite as related to the coupled effects of elastic back stress and elastic mismatch caused by the martensitic transformation. Furthermore, we also discuss the issues about the stress affected zone of the individual B2 phase and the stability of the crystalline-amorphous interface. Given the general agreement between the theoretical and experimental findings, we believe that the outcome of our current work can lead to a deeper understanding of the transformation-induced plasticity in the Cu-Zr based metallic glass composites, which should be very useful to the design of the metallic-glass composites with improved ductility., Comment: 32 pages, 11 figures

Published
2016

7. Influence of the Ag concentration on the medium-range order in a CuZrAlAg bulk metallic glass.

Author

Gammer, C, Escher, B, Ebner, C, Minor, AM, Karnthaler, HP, Eckert, J, Pauly, S, and Rentenberger, C

Subjects
Biochemistry and Cell Biology, Other Physical Sciences
Abstract

Fluctuation electron microscopy of bulk metallic glasses of CuZrAl(Ag) demonstrates that medium-range order is sensitive to minor compositional changes. By analyzing nanodiffraction patterns medium-range order is detected with crystal-like motifs based on the B2 CuZr structure and its distorted structures resembling the martensitic ones. This result demonstrates some structural homology between the metallic glass and its high temperature crystalline phase. The amount of medium-range order seems slightly affected with increasing Ag concentration (0, 2, 5 at.%) but the structural motifs of the medium-range ordered clusters become more diverse at the highest Ag concentration. The decrease of dominant clusters is consistent with the destabilization of the B2 structure measured by calorimetry and accounts for the increased glass-forming ability.

Published
2017

38. Microstructure and properties of TiB2-reinforced Ti-35Nb-Zr-5Ta processed by laser-powder bed fusion

Author

Batalha, R.L., Pinotti, V.E., Alnoaimy, O.O.S., Batalha, W.C., Gustmann, T., Kosiba, K., Pauly, S., Bolfarini, C., Kiminami, C.S., Gargarella, P., and Publica

Abstract

The Ti-35Nb-7Zr-5Ta (wt%, TNZT) alloy was reinforced with TiB2 and synthesized by L-PBF. The relatively small TiB2 particles change the solidification structure from cellular to columnar-dendritic and lead to submicron TiB precipitation in the v matrix. This results in pronounced grain refinement and reduction of texture. However, the microstructure of the additively manufactured TNZT-TiB2 is still different from the as-cast, unreinforced TNZT, which contains equiaxed and randomly oriented grains. The v phase is less stable in the as-cast samples, leading to stress-induced martensitic transformation and recoverable strain of 1.5%. The TNZT with 1 wt% of TiB2 presents significantly higher compressive strength (sYS = 495 MPa) compared to unreinforced samples (sYS = 430 MPa), without sacrificing ductility or altering Young's modulus (E ≈ 46 GPa). The addition of a small fraction of TiB2 to the TNZT alloy synthesized by L-PBF is a promising alternative for manufacturing sophisticated components for biomedical applications.

Published
2022

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