Study of martensitic transformation in TiNiHfZr high temperature shape memory alloy using in situ neutron diffraction

2021 ◽  
pp. 163322
Author(s):  
A. Shuitcev ◽  
R.N Vasin ◽  
A.M Balagurov ◽  
L. Li ◽  
I.A. Bobrikov ◽  
...  
Keyword(s):  
High Temperature ◽  
Martensitic Transformation ◽  
Neutron Diffraction ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
In Situ Neutron Diffraction

In situ neutron diffraction studies of the R-phase transformation in the NiTi shape memory alloy

2002 ◽  
Vol 74 (0) ◽  
pp. s1121-s1123 ◽  
Author(s):  
P. Luk�? ◽  
P. ?ittner ◽  
D. Lugovoy ◽  
D. Neov ◽  
M. Ceretti
Keyword(s):  
Phase Transformation ◽  
Neutron Diffraction ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Niti Shape Memory Alloy ◽  
In Situ Neutron Diffraction

Stress Induced Martensitic Transformation in Shape Memory Alloys Studied by In-Situ Neutron Diffraction Techniques

2000 ◽  
Author(s):  
P. Šittner ◽  
V. Novák ◽  
P. Lukáš ◽  
D. Neov
Keyword(s):  
Martensitic Transformation ◽  
Neutron Diffraction ◽  
Shape Memory ◽  
Smart Materials ◽  
Hybrid Composites ◽  
Tensile Tests ◽  
Internal Stresses ◽  
Lattice Plane ◽  
In Situ Neutron Diffraction

Abstract Shape memory alloy (SMA) elements are being embedded in smart materials and hybrid composites as actuating and/or sensing elements responding to the stress and temperature stimuli. In order to design smart composites, in-situ experimental information about evolution of internal stresses and phase fractions in the embedded SMA elements and internal stresses in neighboring matrix during actuation cycles would be of interest. Such experimental data have to be obtained nondestructively from the microscopic particles or fibres deep in the bulk specimens exposed to stress and/or thermal variations. In-situ neutron diffraction experimental techniques fulfill in principle these requirements. However, reliable evaluation of internal stresses from neutron diffraction experiments in the smart SMA composites can be made only after the lattice plane responses of monolithic SMAs in thermomechanical cyclic loads are fully understood. In this paper, the results of the in-situ investigations of stress induced martensitic transformation (SIMT) in tensile tests carried out on monolithic CuAlZnMn SMA polycrystal are reported, and the observed lattice plane responses are interpreted using a selfconsistent model of SMA polycrystal.

scholarly journals In-situ TEM Observation of γ→ε Martensitic Transformation during Tensile Straining in an Fe–Mn–Si Shape Memory Alloy

1997 ◽  
Vol 38 (12) ◽  
pp. 1072-1077 ◽  
Author(s):  
Bohong Jiang ◽  
Tsugio Tadaki ◽  
Hirotaro Mori ◽  
T. Y. Hsu (Xu Zuyao)
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory

Effect of the Addition of Gd on Ni53Mn22Co6Ga19 High-Temperature Shape Memory Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 2095-2098
Author(s):  
Yun Qing Ma ◽  
Shui Yuan Yang ◽  
San Li Lai ◽  
Shi Wen Tian ◽  
Cui Ping Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Earth Element ◽  
Stress And Strain ◽  
Martensitic Transformation Temperature ◽  
Rich Phase ◽  
Shape Memory Properties

The rare earth element Gd is added to Ni53Mn22Co6Ga19 high-temperature shape memory alloy to refine the grain size and adjust the distribution of γ phase, and their microstructure, martensitic transformation behaviors, mechanical and shape memory properties were investigated. The results show that the grain size is obviously decreased and the γ phase tends to segregate at grain boundaries with increasing Gd content. Small amounts of Gd-rich phase were formed with 0.1 at.% Gd addition. The martensitic transformation temperature abruptly increases with 0.1 at.% Gd addition, then almost keeps constant with further increasing Gd content. The addition of 0.1 at.% Gd is proved to be beneficial to both tensile stress and strain before fracture, but negative to the shape-memory effect.

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