Phase Transformation, Twinning, and Detwinning of NiTi Shape-Memory Alloy Subject to a Shock Wave Based on Molecular-Dynamics Simulation

Martensitic transformation, reverse martensitic transformation, twinning, and detwinning of equiatomic nickel–titanium shape-memory alloy (NiTi SMA) under the action of a shock wave are studied using a molecular-dynamics simulation. In the loading process of a shock wave, B2 austenite is transformed...

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Vydáno v:Materials Ročník 11; číslo 11; s. 2334
Hlavní autoři: Wang, Man, Jiang, Shuyong, Zhang, Yanqiu
Médium: Journal Article
Jazyk:angličtina
Vydáno: Switzerland MDPI AG 21.11.2018
MDPI
Témata:
Alloys
Austenite
Crystal structure
Cyclic loads
Engineering
Experiments
Grain size
Intermetallic compounds
Lasers
Martensite
Martensitic transformations
Mechanical properties
Molecular dynamics
Nickel base alloys
Nickel titanides
Phase transitions
Repeated loading
Researchers
Shape effects
Shape memory
Shape memory alloys
Shock waves
Studies
Superelasticity
Temperature effects
Twinning
China
molecular-dynamics simulation
shape-memory alloy
NiTi alloy
shock loading
matrensitic transformation
ISSN:1996-1944, 1996-1944
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Popis
Shrnutí:Martensitic transformation, reverse martensitic transformation, twinning, and detwinning of equiatomic nickel–titanium shape-memory alloy (NiTi SMA) under the action of a shock wave are studied using a molecular-dynamics simulation. In the loading process of a shock wave, B2 austenite is transformed into B19′ martensite, whereas in the unloading process of the shock wave, B19′ martensite is transformed into B2 austenite. With repeated loading and unloading of the shock wave, martensitic transformation occurs along with twinning, but reverse martensitic transformation appears along with detwinning. The mechanisms for the twinning and detwinning of NiTi SMA subjected to a shock wave are revealed in order to lay the theoretical foundation to investigate the shape-memory effect and superelasticity.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma11112334