Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations
A combined program of experiments and simulations is used to study the problem of cyclic indentation loading on metallic glasses. The experiments use a spherical nanoindenter tip to study shear band formation in three glasses (two based on Pd and one on Fe), after subjecting the glass to cycles of l...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Taylor & Francis Group
2012
|
| Online Access: | http://hdl.handle.net/1721.1/69864 https://orcid.org/0000-0001-9856-2682 |
| _version_ | 1811089668257611776 |
|---|---|
| author | Packard, Corinne E. Homer, Eric R. Al-Aqeeli, N. Schuh, Christopher A. |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Packard, Corinne E. Homer, Eric R. Al-Aqeeli, N. Schuh, Christopher A. |
| author_sort | Packard, Corinne E. |
| collection | MIT |
| description | A combined program of experiments and simulations is used to study the problem of cyclic indentation loading on metallic glasses. The experiments use a spherical nanoindenter tip to study shear band formation in three glasses (two based on Pd and one on Fe), after subjecting the glass to cycles of load in the nominal elastic range. In all three glasses, such elastic cycles lead to significant increases in the load required to subsequently trigger the first shear band. This cyclic hardening occurs progressively over several cycles, but eventually saturates. The effect requires cycles of sufficient amplitude and is not induced by sustained loading alone. The simulations employed a new shear transformation zone (STZ) dynamics code to reveal the local STZ operations that occur beneath an indenter during cycling. These results reveal a plausible mechanism for the observed cyclic hardening: local regions of confined microplasticity can develop progressively over several cycles, without being detectable in the global load–displacement response. It is inferred that significant structural change must attend such microplasticity, leading to hardening of the glass. |
| first_indexed | 2024-09-23T14:22:51Z |
| format | Article |
| id | mit-1721.1/69864 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:22:51Z |
| publishDate | 2012 |
| publisher | Taylor & Francis Group |
| record_format | dspace |
| spelling | mit-1721.1/698642022-09-29T09:03:41Z Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations Packard, Corinne E. Homer, Eric R. Al-Aqeeli, N. Schuh, Christopher A. Massachusetts Institute of Technology. Department of Materials Science and Engineering Schuh, Christopher A. Packard, Corinne E. Homer, Eric R. Al-Aqeeli, N. Schuh, Christopher A. A combined program of experiments and simulations is used to study the problem of cyclic indentation loading on metallic glasses. The experiments use a spherical nanoindenter tip to study shear band formation in three glasses (two based on Pd and one on Fe), after subjecting the glass to cycles of load in the nominal elastic range. In all three glasses, such elastic cycles lead to significant increases in the load required to subsequently trigger the first shear band. This cyclic hardening occurs progressively over several cycles, but eventually saturates. The effect requires cycles of sufficient amplitude and is not induced by sustained loading alone. The simulations employed a new shear transformation zone (STZ) dynamics code to reveal the local STZ operations that occur beneath an indenter during cycling. These results reveal a plausible mechanism for the observed cyclic hardening: local regions of confined microplasticity can develop progressively over several cycles, without being detectable in the global load–displacement response. It is inferred that significant structural change must attend such microplasticity, leading to hardening of the glass. United States. Office of Naval Research (Grant No. N00014-08-10312) United States. Army Research Office (National Defense Science and Engineering Graduate Fellowship) King Fahd University of Petroleum and Minerals 2012-03-26T19:38:36Z 2012-03-26T19:38:36Z 2010-03 2009-09 Article http://purl.org/eprint/type/JournalArticle 1478-6435 1478-6433 http://hdl.handle.net/1721.1/69864 Packard, C.E. et al. “Cyclic Hardening of Metallic Glasses Under Hertzian Contacts: Experiments and STZ Dynamics Simulations.” Philosophical Magazine 90.10 (2010): 1373–1390. https://orcid.org/0000-0001-9856-2682 en_US http://dx.doi.org/10.1080/14786430903352664 Philosophical Magazine Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Taylor & Francis Group Prof. Schuh via Angie Locknar |
| spellingShingle | Packard, Corinne E. Homer, Eric R. Al-Aqeeli, N. Schuh, Christopher A. Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations |
| title | Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations |
| title_full | Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations |
| title_fullStr | Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations |
| title_full_unstemmed | Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations |
| title_short | Cyclic Hardening of Metallic Glasses under Hertzian Contacts: Experiments and STZ Dynamics Simulations |
| title_sort | cyclic hardening of metallic glasses under hertzian contacts experiments and stz dynamics simulations |
| url | http://hdl.handle.net/1721.1/69864 https://orcid.org/0000-0001-9856-2682 |
| work_keys_str_mv | AT packardcorinnee cyclichardeningofmetallicglassesunderhertziancontactsexperimentsandstzdynamicssimulations AT homerericr cyclichardeningofmetallicglassesunderhertziancontactsexperimentsandstzdynamicssimulations AT alaqeelin cyclichardeningofmetallicglassesunderhertziancontactsexperimentsandstzdynamicssimulations AT schuhchristophera cyclichardeningofmetallicglassesunderhertziancontactsexperimentsandstzdynamicssimulations |