Grain size dependence of Young’s modulus and hardness for nanocrystalline NiTi shape memory alloy

2018 ◽  
Vol 211 ◽  
pp. 352-355 ◽  
Author(s):  
Minglu Xia ◽  
Pan Liu ◽  
Qingping Sun
Keyword(s):  
Grain Size ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Young’S Modulus ◽  
Size Dependence ◽  
Young's Modulus ◽  
Niti Shape Memory Alloy

Design of Shape Memory Alloy Springs With Applications in Vibration Control

1993 ◽  
Vol 115 (1) ◽  
pp. 129-135 ◽  
Author(s):  
C. Liang ◽  
C. A. Rogers
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Vibration Control ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Design Method ◽  
Control Area ◽  
Spring Constant ◽  
Damping Capacity

Shape memory alloys (SMAs) have several unique characteristics, including their Young’s modulus-temperature relations, shape memory effects, and damping characteristics. The Young’s modulus of the high-temperature austenite of SMAs is about three to four times as large as that of low-temperature martensite. Therefore, a spring made of shape memory alloy can change its spring constant by a factor of three to four. Since a shape memory alloy spring can vary its spring constant, provide recovery stress (shape memory effect), or be designed with a high damping capacity, it may be useful in adaptive vibration control. Some vibration control concepts utilizing the unique characteristics of SMAs will be presented in this paper. Shape memory alloy springs have been used as actuators in many applications although their use in the vibration control area is very recent. Since shape memory alloys differ from conventional alloy materials in many ways, the traditional design approach for springs is not completely suitable for designing SMA springs. Some design approaches based upon linear theory have been proposed for shape memory alloy springs. A more accurate design method for SMA springs based on a new nonlinear thermomechanical constitutive relation of SMA is also presented in this paper.

Nucleation of martensite and thermal hysteresis of the young’s modulus in a Ni50.8Ti49.2 shape memory alloy

1999 ◽  
Vol 41 (11) ◽  
pp. 1211-1216 ◽  
Author(s):  
R. Campanella ◽  
B. Coluzzi ◽  
A. Biscarini ◽  
L. Trotta ◽  
G. Mazzolai ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Young’S Modulus ◽  
Thermal Hysteresis ◽  
Young's Modulus

Anisotropy in Elastic Properties of Textured TiNbAl Shape Memory Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 1983-1986 ◽  
Author(s):  
Tomonari Inamura ◽  
Hideki Hosoda ◽  
Kenji Wakashima ◽  
Shuichi Miyazaki
Keyword(s):  
Shape Memory Alloy ◽  
Cold Rolling ◽  
Shape Memory ◽  
Young’S Modulus ◽  
Elastic Properties ◽  
Recrystallization Texture ◽  
Room Temperature ◽  
Young's Modulus ◽  
Strong Anisotropy ◽  
Loading Direction

Anisotropy in elastic properties of Ti-24mol%Nb-3mol%Al (TiNbAl), a new biomedical shape memory alloy developed by our group, was characterized in a temperature range from 133K to 413K. A well developed <110>{112}-type recrystallization texture is formed by an annealing at 1273K for 1.8ks after a severe cold-rolling. Young’s modulus of the -phase exhibited a strong anisotropy depending on the loading direction. Young’s modulus along <hkl> of -phase of TiNbAl around room temperature was estimated to be , with assuming that the texture is perfectly developed.

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