Acoustic Emission Avalanches in Martensitic Transitions: New Perspectives for the Problem of Source Location

2011 ◽  
Vol 172-174 ◽  
pp. 144-149 ◽  
Author(s):  
Eduard Vives ◽  
Daniel Enrique Soto Parra ◽  
Antoni Planes ◽  
Lluís Mañosa ◽  
Ricardo Romero ◽  
...  
Keyword(s):  
Finite Element ◽  
Acoustic Emission ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Spatial Resolution ◽  
Finite Element Methods ◽  
Simultaneous Detection ◽  
Martensitic Transformations ◽  
Barkhausen Noise ◽  
Thermally Induced

Different experimental procedures for the location of sources of Acoustic Emission (AE) avalanches during Martensitic Transformations are discussed. A first example corresponds to the 1D location of AE events during stress-induced martensitic transitions in a Cu-Zn-Al shape memory alloy (3.5 cm length). The obtained data allows monitoring of the interface advancement with a spatial resolution of less than 1 mm. Secondly, we discuss two different ideas that have significant potential for improving this resolution in the case of thermally induced transitions in small single crystalline samples (~1 cm): the use of elastodynamic simulations based on finite element methods and the simultaneous detection of AE and Barkhausen noise in ferromagnetic samples.

Dynamic Behavior of Two Types of Martensitic Transformations in Cu-Al-Ni Shape Memory Alloy Single Crystal by Acoustic Emission Method

2006 ◽  
Vol 13-14 ◽  
pp. 305-312
Author(s):  
Kenichi Yoshida ◽  
T. Yasuda ◽  
D. Tani ◽  
H. Nishino
Keyword(s):  
Acoustic Emission ◽  
Structural Change ◽  
Shape Memory Alloy ◽  
Single Crystal ◽  
Shape Memory ◽  
Dynamic Behavior ◽  
Rise Time ◽  
Tensile Deformation ◽  
Martensitic Transformations ◽  
Alloy Single Crystal

Dynamic behavior of two types of martensitic transformations during tensile deformation of Cu-Al-Ni shape memory alloy single crystal has been investigated using an acoustic emission waveform analysis. Two kinds of martensitic transformations consist of β1 ⇔ β1′ (structural change of DO3 to 18R) and β1 ⇒ γ1′ (structural change of DO3 to 2H), each of which is called super-elastic and thermo-elastic martensitic transformations, respectively. These two types of martensitic transformations could be obtained during tensile deformation because of different heat treatment. The rise time at the source (the source rise time) in finite elastic solid by the modified Takashima’s method was analyzed using the acoustic emission waveform detected during the martensitic transformation. The mean source rise time to the γ1′ phase was smaller than that to the β1′ phase before yielding and became the same after yielding. The former result means that the nucleation of the γ1′ phase is faster than that of the β1′ phase because of different crystallographic structure. The latter result is that the growth rate of the γ1′ phase is the same as that of the β1′ phase.

scholarly journals Thermally induced martensitic transformations in Cu-based shape memory alloy microwires

2015 ◽  
Vol 50 (22) ◽  
pp. 7473-7487 ◽  
Author(s):  
Nihan Tuncer ◽  
Lei Qiao ◽  
Raul Radovitzky ◽  
Christopher A. Schuh
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensitic Transformations ◽  
Thermally Induced

Martensitic transformations and kinetics in Ti-Ni-Cu-Hf shape memory alloy

2021 ◽  
pp. 129732
Author(s):  
Jun Li ◽  
Kuishan Sun ◽  
Yuqi Jiang ◽  
Xianglong Meng ◽  
Wei Cai
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensitic Transformations
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