Improved superelastic stability of NiTi shape memory alloys through surface nano-crystallization followed by low temperature aging treatment

2021 ◽  
Vol 131 ◽  
pp. 107114
Author(s):  
Xiaoqiang Li ◽  
Hu Chen ◽  
Weimin Guo ◽  
Yanjin Guan ◽  
Zuocheng Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Aging Treatment ◽  
Low Temperature Aging ◽  
Niti Shape Memory Alloys ◽  
Temperature Aging

Low Temperature Ageing Effects in NiTi Shape Memory Alloys

2014 ◽  
Vol 4 (2) ◽  
pp. 73
Author(s):  
K. Hari Krishnan ◽  
P. S. Misra ◽  
K. Chandra ◽  
Vinod S. Agarwala
Keyword(s):  
Low Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ageing Effects ◽  
Temperature Ageing ◽  
Niti Shape Memory Alloys

scholarly journals A Novel Design to Enhance the Mechanical Properties in Cu-Bearing Antibacterial Stainless Steel

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 403
Author(s):  
Shaoheng Sun ◽  
Zhiyong Xue ◽  
Licong An ◽  
Xiaohua Chen ◽  
Yifei Liu
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Antibacterial Properties ◽  
Aging Treatment ◽  
Copper Precipitation ◽  
The Matrix ◽  
Novel Method ◽  
Low Temperature Aging ◽  
Novel Design ◽  
Temperature Aging

A novel method based on nano-scale precipitation hardening has been studied to strengthen copper-bearing ferrite antibacterial stainless steel. Bimodal precipitations can be observed after antibacterial annealing and low temperature aging treatment, which are large rod-shaped precipitates and nano-sized spherical precipitates, respectively. Due to two different morphological precipitates, the strength of the material is significantly improved without sacrificing formability, and at the same time, the excellent antibacterial properties remain. Under low temperature aging treatment, there is no obvious evidence to show the segregation at the interface between the rod-shaped copper precipitation and the matrix due to the low segregation coefficient of copper. The nano-sized copper precipitation uniformly nucleated and distributed on the matrix. The optimized heat treatment process is antibacterial annealing at 800 °C for half an hour followed by one-hour-aging treatment at 550 °C.

Multi-stage martensitic transformation in Ni-rich NiTi shape memory alloys

2017 ◽  
Vol 10 (01) ◽  
pp. 1740004 ◽  
Author(s):  
Xiebin Wang ◽  
Bert Verlinden ◽  
Sergey Kustov
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Precipitation Hardening ◽  
Aging Treatment ◽  
Functional Stability ◽  
Transformation Behavior ◽  
Niti Alloys ◽  
Multi Stage ◽  
Niti Shape Memory Alloys

Precipitation hardening is an effective way to improve the functional stability of NiTi shape memory alloys. The precipitates, mainly Ni4Ti3, could be introduced by aging treatment in Ni-rich NiTi alloys. However, the presence of Ni4Ti3 precipitates could disturb the transformation behavior, resulting in the multi-stage martensitic transformation (MMT). With the presence of MMT, it is difficult to control the transformation behavior, and thus limits the applicability of NiTi alloys. In this work, previous efforts on explaining the observed MMT are summarized. The difficulties in developing a unified explanation are discussed, and a possible way to avoid the MMT is proposed.

Influence of low temperature plasma oxynitriding on the mechanical behavior of NiTi shape memory alloys

Vacuum ◽  
2018 ◽  
Vol 156 ◽  
pp. 135-139 ◽  
Author(s):  
Justyna Witkowska ◽  
Jacek Rudnicki ◽  
Witold Piekoszewski ◽  
Gerhard Raugh ◽  
Jerzy Morgiel ◽  
...  
Keyword(s):  
Low Temperature ◽  
Shape Memory Alloys ◽  
Mechanical Behavior ◽  
Shape Memory ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Niti Shape Memory Alloys

Balance of mechanical properties of Mg-8Li-3Al-2Zn-0.5Y alloy by solution and low-temperature aging treatment

2019 ◽  
Vol 791 ◽  
pp. 655-664 ◽  
Author(s):  
Hao Ji ◽  
Xiang Peng ◽  
Xiaolong Zhang ◽  
Wencai Liu ◽  
Guohua Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Aging Treatment ◽  
Low Temperature Aging ◽  
Temperature Aging

Effect of low-temperature precipitation on the transformation characteristics of Ni-rich NiTi shape memory alloys during thermal cycling

2010 ◽  
Vol 18 (6) ◽  
pp. 1172-1179 ◽  
Author(s):  
M.F.-X. Wagner ◽  
S.R. Dey ◽  
H. Gugel ◽  
J. Frenzel ◽  
Ch. Somsen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Shape Memory Alloys ◽  
Thermal Cycling ◽  
Shape Memory ◽  
Niti Shape Memory Alloys
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