Evolution of microstructure and property of NiTi alloy induced by cold rolling

Li, Y.; Li, J.Y.; Liu, M.; Ren, Yaoyao; Chen, F.; Yao, Gongcheng; Mei, Q.S.

doi:10.1016/j.jallcom.2015.09.056

Cited by 43 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 13 ] However, further cold rolling will increase the modulus due to the formation of amorphous. [ 14 ] Thus, the key question relies on whether it is possible to further decrease the elastic modulus by regulating phase transition behavior through introducing more defects without amorphous.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

Zhao

Liang

et al. 2022

Adv Eng Mater

View full text Add to dashboard Cite

Herein, a quasi‐linear superelasticity (≈2.3%) with the ultralow elastic modulus (≈18 GPa) over a wide temperature range (≈55 K) in tensile cyclic deformed TiNi shape memory alloys is reported. Differential scanning analysis (DSC) and dynamic mechanical analysis (DMA) show the suppression of normal martensitic transformation (MT) and the appearance of strain glass transition behavior. Electron backscatter diffraction (EBSD) analysis shows the existence of high‐density defects involving twin boundaries and dislocations under tensile cyclic deformation. Further transmission electron microscope (TEM) observation reveals stabilized B19' nanodomains after tensile cyclic deformation. The observed deformation defects and stabilized B19' nanodomains impose significant influence on the following transition behavior and mechanical property, yielding the detected quasi‐linear superelasticity with ultralow modulus. Herein, an effective way to design unique phase transitions with unprecedented properties by defect engineering may be suggested.

show abstract

Section: Introductionmentioning

confidence: 99%

Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

Zhao

Liang

et al. 2022

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…It has been proposed that the existence of Ni 4 Ti 3 precipitates contribute to the emergence of the R phase, which plays a significant role in multiple-stage transformation of SMAs. Severe plastic deformation (SPD) methods, such as high pressure torsion (HPT) [10,11], cold drawing [12,13], cold rolling [14], surface mechanical attrition treatment (SMAT) [15], and local canning compression [16], can lead to amorphization of NiTi SMAs at lower temperatures. In addition, amorphous NiTi SMA induced by means of SPD is able to be subjected to crystallization in the case of proper heat treatment, where even nanocrystalline NiTi SMA can be produced.…”

Section: Introductionmentioning

confidence: 99%

Role of Severe Plastic Deformation in Suppressing Formation of R Phase and Ni4Ti3 Precipitate of NiTi Shape Memory Alloy

Jiang

Zhang

2017

Metals

View full text Add to dashboard Cite

Microstructural evolution of NiTi shape memory alloy (SMA) with a nominal composition of Ni 50.9 Ti 49.1 (at %) is investigated on the basis of heat treatment and severe plastic deformation (SPD). As for as-rolled NiTi SMA samples subjected to aging, plenty of R phases appear in the austenite matrix. In terms of as-rolled NiTi SMA samples undergoing solution treatment and aging, Ni 4 Ti 3 precipitates arise in the austenite matrix. In the case of as-rolled NiTi SMA samples subjected to SPD and aging, martensitic twins are observed in the matrix of NiTi SMA. With respect to as-rolled NiTi SMA samples subjected to solution treatment, SPD, and aging, neither R phases nor Ni 4 Ti 3 precipitates are observed in the matrix of NiTi SMA. The dislocation networks play an important role in the formation of the R phase. SPD leads to amorphization of NiTi SMA, and in the case of annealing, amorphous NiTi SMA samples are subjected to crystallization. This contributes to suppressing the occurrence of R phase and Ni 4 Ti 3 precipitate in NiTi SMA.

show abstract

“…The FWHM describes the width of the diffraction peaks. It is related to the heat treatment, surface hardening, and other microscopic residual stresses caused by the grain size and the value of deformation and dislocation density [14,24]. In Figure 9b, the FWHM of the rolling surface is higher than the milling surface.…”

Section: Generation Mechanism Of Residual Stressesmentioning

confidence: 97%

Study on the Surface Integrity of a Thin-Walled Aluminum Alloy Structure after a Bilateral Slid Rolling Process

Sun

Han

et al. 2016

Metals

View full text Add to dashboard Cite

Abstract:For studying the influence of a bilateral slid rolling process (BSRP) on the surface integrity of a thin-walled aluminum alloy structure, and revealing the generation mechanism of residual stresses, a self-designed BSRP appliance was used to conduct rolling experiments. With the aid of a surface optical profiler, an X-ray stress analyzer, and a scanning electron microscope (SEM), the differences in surface integrity before and after BSRP were explored. The internal changing mechanism of physical as well as mechanical properties was probed. The results show that surface roughness (Ra) is reduced by 23.7%, microhardness is increased by 21.6%, and the depth of the hardening layer is about 100 µm. Serious plastic deformation was observed within the subsurface of the rolled region. The residual stress distributions along the depth of the rolling surface and milling surface were tested respectively. Residual stresses with deep and high amplitudes were generated via the BSRP. Based on the analysis of the microstructure, the generation mechanism of the residual stresses was probed. The residual stress of the rolling area consisted of two sections: microscopic stresses caused by local plastic deformation and macroscopic stresses caused by overall non-uniform deformation.

show abstract

Evolution of microstructure and property of NiTi alloy induced by cold rolling

Cited by 43 publications

References 25 publications

Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

Role of Severe Plastic Deformation in Suppressing Formation of R Phase and Ni4Ti3 Precipitate of NiTi Shape Memory Alloy

Study on the Surface Integrity of a Thin-Walled Aluminum Alloy Structure after a Bilateral Slid Rolling Process

Contact Info

Product

Resources

About