TY - JOUR
T1 - Exploiting ultra-large linear elasticity over a wide temperature range in nanocrystalline NiTi alloy
AU - Sun, Zhen
AU - Hao, Shijie
AU - Kang, Genfa
AU - Ren, Yang
AU - Liu, Junpeng
AU - Yang, Ying
AU - Kong, Xiangguang
AU - Feng, Bo
AU - Wang, Cheng
AU - Zhao, Kun
AU - Cui, Lishan
PY - 2020/11/15
Y1 - 2020/11/15
N2 - Many shape memory alloys can support large recoverable strains of a few percent by reversible stress-induced martensite transformation, yet they behave non-linear within a narrow operating temperature range. Developing the bulk metallic materials with ultra-large linear elasticity over a wide temperature range has proven to be difficult. In this work, a material design concept was proposed, that is true elastic deformation and reversible twinning-detwinning deformation run in parallel to overcome this challenge. By engineering the residual internal stress to realize the concurrency of true elastic deformation and twinning-detwinning deformation, a bulk nanocrystalline NiTi that possesses an ultra-large linear elastic strain up to 5.1 % and a high yield stress of 2.16 GPa over a wide temperature range of 270 °C was developed. This study offers a new avenue for developing the metallic materials with ultra-large linear elasticity over a wide temperature range of 270 °C (from 70 °C to −197 °C).
AB - Many shape memory alloys can support large recoverable strains of a few percent by reversible stress-induced martensite transformation, yet they behave non-linear within a narrow operating temperature range. Developing the bulk metallic materials with ultra-large linear elasticity over a wide temperature range has proven to be difficult. In this work, a material design concept was proposed, that is true elastic deformation and reversible twinning-detwinning deformation run in parallel to overcome this challenge. By engineering the residual internal stress to realize the concurrency of true elastic deformation and twinning-detwinning deformation, a bulk nanocrystalline NiTi that possesses an ultra-large linear elastic strain up to 5.1 % and a high yield stress of 2.16 GPa over a wide temperature range of 270 °C was developed. This study offers a new avenue for developing the metallic materials with ultra-large linear elasticity over a wide temperature range of 270 °C (from 70 °C to −197 °C).
KW - Linear-elasticity
KW - Nanocrystalline
KW - NiTi
KW - Twinning
KW - Wide temperature range
UR - http://www.scopus.com/inward/record.url?scp=85087148945&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85087148945&origin=recordpage
U2 - 10.1016/j.jmst.2020.01.073
DO - 10.1016/j.jmst.2020.01.073
M3 - RGC 21 - Publication in refereed journal
SN - 1005-0302
VL - 57
SP - 197
EP - 203
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -