Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy

Wei-Zhong Han; Jian Zhang; Ming-Shuai Ding; Lan Lv; Wen-Hong Wang; Guang-Heng Wu; Zhi-Wei Shan; Ju Li

doi:10.1021/acs.nanolett.7b01015

Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy

Wei-Zhong Han, Jian Zhang, Ming-Shuai Ding, Lan Lv, Wen-Hong Wang, Guang-Heng Wu, Zhi-Wei Shan, Ju Li

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

30 Citations (Scopus)

Abstract

The intriguing phenomenon of metal superelasticity relies on stress-induced martensitic transformation (SIMT), which is well-known to be governed by developing cooperative strain accommodation at multiple length scales. It is therefore scientifically interesting to see what happens when this natural length scale hierarchy is disrupted. One method is producing pillars that confine the sample volume to micrometer length scale. Here we apply yet another intervention, helium nanobubbles injection, which produces porosity on the order of several nanometers. While the pillar confinement suppresses superelasticity, we found the dispersion of 5-10 nm helium nanobubbles do the opposite of promoting superelasticity in a Ni_53.5Fe_19.5Ga₂₇ shape memory alloy. The role of helium nanobubbles in modulating the competition between ordinary dislocation slip plasticity and SIMT is discussed. © 2017 American Chemical Society.

Original language	English
Pages (from-to)	3725-3730
Journal	Nano Letters
Volume	17
Issue number	6
DOIs	https://doi.org/10.1021/acs.nanolett.7b01015
Publication status	Published - 14 Jun 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

The National Natural Science Foundation of China (Grant Nos. 51471128, 51231005, 51621063, and 51471184). 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 (SQ2017YFGX090025), and the Young Talent Support Plan of XJTU. J.L. acknowledges support by NSF DMR-1410636.

Research Keywords

helium bubble
irradiation
phase transformation
Shape memory alloy
superelasticity

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abstract = "The intriguing phenomenon of metal superelasticity relies on stress-induced martensitic transformation (SIMT), which is well-known to be governed by developing cooperative strain accommodation at multiple length scales. It is therefore scientifically interesting to see what happens when this natural length scale hierarchy is disrupted. One method is producing pillars that confine the sample volume to micrometer length scale. Here we apply yet another intervention, helium nanobubbles injection, which produces porosity on the order of several nanometers. While the pillar confinement suppresses superelasticity, we found the dispersion of 5-10 nm helium nanobubbles do the opposite of promoting superelasticity in a Ni53.5Fe19.5Ga27 shape memory alloy. The role of helium nanobubbles in modulating the competition between ordinary dislocation slip plasticity and SIMT is discussed. {\textcopyright} 2017 American Chemical Society.",

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AU - Han, Wei-Zhong

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AU - Lv, Lan

AU - Wang, Wen-Hong

AU - Wu, Guang-Heng

AU - Shan, Zhi-Wei

AU - Li, Ju

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AB - The intriguing phenomenon of metal superelasticity relies on stress-induced martensitic transformation (SIMT), which is well-known to be governed by developing cooperative strain accommodation at multiple length scales. It is therefore scientifically interesting to see what happens when this natural length scale hierarchy is disrupted. One method is producing pillars that confine the sample volume to micrometer length scale. Here we apply yet another intervention, helium nanobubbles injection, which produces porosity on the order of several nanometers. While the pillar confinement suppresses superelasticity, we found the dispersion of 5-10 nm helium nanobubbles do the opposite of promoting superelasticity in a Ni53.5Fe19.5Ga27 shape memory alloy. The role of helium nanobubbles in modulating the competition between ordinary dislocation slip plasticity and SIMT is discussed. © 2017 American Chemical Society.

KW - helium bubble

KW - irradiation

KW - phase transformation

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Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy

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