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  4. Simulation and experimental characterization of VC precipitation and recovery stress formation in an FeMnSi-based shape memory alloy
 
research article

Simulation and experimental characterization of VC precipitation and recovery stress formation in an FeMnSi-based shape memory alloy

Yang, Yajiao
•
Leinenbach, Christian  
•
Shahverdi, Moslem
January 18, 2023
Journal Of Alloys And Compounds

In this study, TC-PRISMA was employed to simulate the precipitation (number density and radius) of an FeMnSi-based shape memory alloy (FeMnSi-SMA), with a chemical composition of Fe-17Mn-5Si-10Cr-4Ni-1(V, C) (wt%), during one-step and two-step aging processes. In addition, trans-mission electron microscopy (TEM) was used to study the microstructures of the specimens, particularly the VC precipitates, under several selected two-step aging conditions to validate the simulation results. Furthermore, thermomechanical characterization was conducted to investigate the recovery stress of the FeMnSi-SMA under the selected two-step aging conditions. It was found that, compared to only one-step aging, the first aging at a lower temperature (600 degrees C) followed by a second aging at a higher temperature (670 degrees C) can take advantage of both high nucleation rate and high growth rate. This achieves a similar precipitation state in a significantly shorter time (approximately 1/6 of the total duration of the one with one-step aging). The recovery stress value (509 MPa) corresponding to the two-step aging condition (first step: 600 degrees C for 20 h; second step: 670 degrees C for 6 h) shows a similar stress value range (514 MPa) corre-sponding to the one-step aging condition (600 degrees C for 144 h); however, the fracture strain is 40% higher. The number density and VC radii simulated by TC-PRISMA are generally consistent with the TEM observations.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).

  • Details
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Type
research article
DOI
10.1016/j.jallcom.2023.168856
Web of Science ID

WOS:000925293200001

Author(s)
Yang, Yajiao
Leinenbach, Christian  
Shahverdi, Moslem
Date Issued

2023-01-18

Published in
Journal Of Alloys And Compounds
Volume

940

Article Number

168856

Subjects

Chemistry, Physical

•

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

•

Chemistry

•

Materials Science

•

Metallurgy & Metallurgical Engineering

•

femnsi

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precipitate

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two-step aging

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shape memory alloy

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fe-sma

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transformation behavior

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heat-treatment

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kinetics

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deformation

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texture

•

design

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
February 27, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/195247
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