Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass
The sample size effect on the deformation behavior of metallic glasses (MGs) has recently become research of intense interest. An inverse sample size effect is observed in previous experimental studies; where the yield strength decreases with decreasing sample size, rather than increasing. We propos...
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| Format: | Article |
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MDPI AG
2022-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/18/6362 |
| _version_ | 1797485327057682432 |
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| author | Yun Teng Zhen-Dong Sha |
| author_facet | Yun Teng Zhen-Dong Sha |
| author_sort | Yun Teng |
| collection | DOAJ |
| description | The sample size effect on the deformation behavior of metallic glasses (MGs) has recently become research of intense interest. An inverse sample size effect is observed in previous experimental studies; where the yield strength decreases with decreasing sample size, rather than increasing. We propose a theoretical analysis based on the shear banding process to rationalize the inherent size dependence of yield strength, showing an excellent agreement with experimental results. Our model reveals that the anomalous inverse size effect is, in fact, caused by a transition in failure mode; from a rapid shear banding process with a shear band (SB) traversing the entire sample in bulk MGs, to an immature shear banding process with propagated SBs only at the surface in micron-sized MGs. Our results fill the gap in the current understanding of size effects in the strength and failure mechanism of MGs at different length scales. |
| first_indexed | 2024-03-09T23:17:11Z |
| format | Article |
| id | doaj.art-0054d4d3a4ee4265a272f3428a009e65 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:17:11Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-0054d4d3a4ee4265a272f3428a009e652023-11-23T17:32:15ZengMDPI AGMaterials1996-19442022-09-011518636210.3390/ma15186362Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic GlassYun Teng0Zhen-Dong Sha1Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 999077, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaThe sample size effect on the deformation behavior of metallic glasses (MGs) has recently become research of intense interest. An inverse sample size effect is observed in previous experimental studies; where the yield strength decreases with decreasing sample size, rather than increasing. We propose a theoretical analysis based on the shear banding process to rationalize the inherent size dependence of yield strength, showing an excellent agreement with experimental results. Our model reveals that the anomalous inverse size effect is, in fact, caused by a transition in failure mode; from a rapid shear banding process with a shear band (SB) traversing the entire sample in bulk MGs, to an immature shear banding process with propagated SBs only at the surface in micron-sized MGs. Our results fill the gap in the current understanding of size effects in the strength and failure mechanism of MGs at different length scales.https://www.mdpi.com/1996-1944/15/18/6362metallic glass micropillarsize dependenceyield strengthfailure mechanismshear band |
| spellingShingle | Yun Teng Zhen-Dong Sha Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass Materials metallic glass micropillar size dependence yield strength failure mechanism shear band |
| title | Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass |
| title_full | Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass |
| title_fullStr | Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass |
| title_full_unstemmed | Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass |
| title_short | Uncovering the Inherent Size Dependence of Yield Strength and Failure Mechanism in Micron-Sized Metallic Glass |
| title_sort | uncovering the inherent size dependence of yield strength and failure mechanism in micron sized metallic glass |
| topic | metallic glass micropillar size dependence yield strength failure mechanism shear band |
| url | https://www.mdpi.com/1996-1944/15/18/6362 |
| work_keys_str_mv | AT yunteng uncoveringtheinherentsizedependenceofyieldstrengthandfailuremechanisminmicronsizedmetallicglass AT zhendongsha uncoveringtheinherentsizedependenceofyieldstrengthandfailuremechanisminmicronsizedmetallicglass |