Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Michael Atzmon"'
Publikováno v:
Materials, Vol 16, Iss 23, p 7444 (2023)
The lack of periodicity and long-range order poses significant challenges in explaining and modeling the properties of metallic glasses. Conventional modeling of nonexponential relaxation with stretched exponents leads to inconsistencies and rarely o
Externí odkaz:
https://doaj.org/article/a1afd9f4f87049db9ca0851b44bdff35
Publikováno v:
Acta Materialia. 195:81-86
The mechanical relaxation behavior of metallic glasses (MGs) is composition sensitive. For example, in dynamic mechanical analysis, La70Ni15Al15 shows a pronounced secondary peak, termed β relaxation, of the normalized loss modulus at high frequency
Microscopic characterization of structural relaxation and cryogenic rejuvenation in metallic glasses
Publikováno v:
Acta Materialia. 164:165-170
Plasticity improvement in metallic glasses resulting from cycling treatment between room and liquid nitrogen temperature has been reported and attributed to rejuvenation due to a non-uniform thermal expansion coefficient. However, the detailed micros
Metallic glasses with pronounced high-frequency \ensuremath{\beta} relaxation in their dynamic-mechanical response have been observed to exhibit large plasticity. Due to their disordered atomic structure, it is challenging to identify the microscopic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5202b4ec854921643789de47945d2ab
Autor:
Tianjiao Lei, Michael Atzmon
Publikováno v:
Journal of Applied Physics. 126:185104
At high stress, the viscosity of a metallic glass is non-Newtonian, and therefore the rate of anelastic stress relaxation is not linear in the applied stress. In this regime, one can obtain information on the details of the activation volume that are
Autor:
Jungdoo Ju, Michael Atzmon
Publikováno v:
Acta Materialia. 74:183-188
It is shown that assumed anelastic relaxation-time spectra can be recovered reliably from simulated loss–modulus curves that include noise by nonlinear least-squares fitting. The same method is used to obtain spectra for published experimental data
Autor:
Michael Atzmon, JongDoo Ju
Publikováno v:
Journal of Alloys and Compounds. 643:S8-S10
For many years, the only experimental activation free energy spectrum for shear transformations in metallic glasses had been obtained by quenching from high temperature during creep, followed by temperature stepping (Argon and Kuo, 1980). We show tha
Autor:
Michael Atzmon, W. H. Jiang
Publikováno v:
Journal of Alloys and Compounds. 509:7395-7399
The rate dependence of serrated flow in amorphous Al 86.8 Ni 3.7 Y 9.5 has been investigated by nanoindentation. Three samples, containing different initial amounts and distributions of free volume, were used: as quenched, cold rolled and annealed be