Abstract
The influence of nanoscale helium bubbles on the deformation twinning and detwinning behavior of submicron-sized Cu is investigated under tension, compression, and cyclic loading. In situ nanomechanical tests performed inside a transmission electron microscope reveal that twinning and detwinning occur readily in helium irradiated copper under both tension and compression. Continuous shearing of helium bubbles by Shockley partials leads to twin formation, whereas the residual back-stress accumulated from dislocation-bubble interactions assist in detwinning. These interactions also elevate the critical shear stress for partial dislocation slip in helium irradiated Cu compared to that in fully dense Cu. The growth twin boundaries can significantly enhance the twinning stress in helium irradiated Cu pillar, and deformation twin-growth twin boundary interaction promotes the formation of internal crack and thus accelerates failure. The effect of crystallographic orientation and sample size on the overall deformation characteristics of helium irradiated Cu is briefly discussed. The current studies show that deformation twinning and detwinning are also active deformation models in helium irradiated small-volume copper. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
| Original language | English |
|---|---|
| Article number | 1700357 |
| Journal | Advanced Engineering Materials |
| Volume | 19 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1 Dec 2017 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to <a href="mailto:[email protected]">[email protected]</a>.Funding
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51471128, 51231005, 51621063). W.Z.H. would like to thank the support of Youth Thousand Talents Program of China, the National Key Research and Development Program of China (2017YFB0702300) and the Young Talent Support Plan of XJTU. W.Z.H. acknowledges the assistance of E.G.F and Y.Q.W in ion implantation.
Research Keywords
- crack
- detwinning
- helium bubble
- in situ TEM
- twinning
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