Details
| Original language | English |
|---|---|
| Article number | 147309 |
| Journal | Materials Science and Engineering: A |
| Volume | 916 |
| Early online date | 24 Sept 2024 |
| Publication status | Published - Nov 2024 |
Abstract
Today, two-way shape memory alloys have become increasingly popular in various industries. In this study, innovative nitinol-based bi-layers were fabricated using the additive approach. The purpose of the study was to examine the characteristics of a bi-layer sample made of Ni50.8Ti49.2 that was deposited using Laser Powder Bed Fusion on a Ni45Ti50Cu5 substrate made by vacuum arc remelting. Transmission electron microscopy with high resolution was used to study the bi-layer's microstructure. The as-printed bi-layer exhibits dislocation, stacking faults, precipitates such Ni4Ti3 and Ti2Ni, compound twins, and Type Ⅱ twins, according to the transmission electron microscopy investigation. After going through annealing at a temperature of 1000 °C for a duration of 16 h, it was observed that Type Ⅰ and compound twins were the prevailing characteristics. Furthermore, it has been demonstrated that subjecting the material to heat treatment leads to enhanced elongation and reduced fracture stress. The sample aged at 500 °C for 30 min exhibited the most favorable properties, including a maximum elongation of 10 ± 0.1 % after 12 incremental cycles. In addition, the bi-layer samples exhibited both pseudoelasticity and shape memory effect, with approximately 80 % intrinsic reversible two-way shape memory behavior. The findings of this study can be applied in the production of various actuators.
Keywords
- Laser powder bed fusion, Nitinol, Pseudoelasticity, Shape memory effect, Stacking faults
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials Science and Engineering: A, Vol. 916, 147309, 11.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Microstructure and shape memory behavior of a bi-layer fabricated by NiTi deposition on NiTiCu substrate using laser powder bed fusion
AU - Memarian, Mahshid
AU - Mohri, Maryam
AU - Leinenbach, Christian
AU - Kulkarni, Pranav Vivek
AU - Ghafoori, Elyas
AU - Nili-Ahmadabadi, Mahmoud
N1 - Publisher Copyright: © 2024 Elsevier B.V.
PY - 2024/11
Y1 - 2024/11
N2 - Today, two-way shape memory alloys have become increasingly popular in various industries. In this study, innovative nitinol-based bi-layers were fabricated using the additive approach. The purpose of the study was to examine the characteristics of a bi-layer sample made of Ni50.8Ti49.2 that was deposited using Laser Powder Bed Fusion on a Ni45Ti50Cu5 substrate made by vacuum arc remelting. Transmission electron microscopy with high resolution was used to study the bi-layer's microstructure. The as-printed bi-layer exhibits dislocation, stacking faults, precipitates such Ni4Ti3 and Ti2Ni, compound twins, and Type Ⅱ twins, according to the transmission electron microscopy investigation. After going through annealing at a temperature of 1000 °C for a duration of 16 h, it was observed that Type Ⅰ and compound twins were the prevailing characteristics. Furthermore, it has been demonstrated that subjecting the material to heat treatment leads to enhanced elongation and reduced fracture stress. The sample aged at 500 °C for 30 min exhibited the most favorable properties, including a maximum elongation of 10 ± 0.1 % after 12 incremental cycles. In addition, the bi-layer samples exhibited both pseudoelasticity and shape memory effect, with approximately 80 % intrinsic reversible two-way shape memory behavior. The findings of this study can be applied in the production of various actuators.
AB - Today, two-way shape memory alloys have become increasingly popular in various industries. In this study, innovative nitinol-based bi-layers were fabricated using the additive approach. The purpose of the study was to examine the characteristics of a bi-layer sample made of Ni50.8Ti49.2 that was deposited using Laser Powder Bed Fusion on a Ni45Ti50Cu5 substrate made by vacuum arc remelting. Transmission electron microscopy with high resolution was used to study the bi-layer's microstructure. The as-printed bi-layer exhibits dislocation, stacking faults, precipitates such Ni4Ti3 and Ti2Ni, compound twins, and Type Ⅱ twins, according to the transmission electron microscopy investigation. After going through annealing at a temperature of 1000 °C for a duration of 16 h, it was observed that Type Ⅰ and compound twins were the prevailing characteristics. Furthermore, it has been demonstrated that subjecting the material to heat treatment leads to enhanced elongation and reduced fracture stress. The sample aged at 500 °C for 30 min exhibited the most favorable properties, including a maximum elongation of 10 ± 0.1 % after 12 incremental cycles. In addition, the bi-layer samples exhibited both pseudoelasticity and shape memory effect, with approximately 80 % intrinsic reversible two-way shape memory behavior. The findings of this study can be applied in the production of various actuators.
KW - Laser powder bed fusion
KW - Nitinol
KW - Pseudoelasticity
KW - Shape memory effect
KW - Stacking faults
UR - http://www.scopus.com/inward/record.url?scp=85204876669&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2024.147309
DO - 10.1016/j.msea.2024.147309
M3 - Article
AN - SCOPUS:85204876669
VL - 916
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
SN - 0921-5093
M1 - 147309
ER -