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Microstructural Analysis and Mechanical Characterization of Shape Memory Alloy Ni-Ti-Ag Synthesized by Casting Route

Salman, Khansaa Dawood ; Al-Maliki, Wisam Abed Kattea ; Alobaid, Falah ; Epple, Bernd (2022):
Microstructural Analysis and Mechanical Characterization of Shape Memory Alloy Ni-Ti-Ag Synthesized by Casting Route. (Publisher's Version)
In: Applied Sciences, 12 (9), MDPI, e-ISSN 2076-3417,
DOI: 10.26083/tuprints-00022071,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Microstructural Analysis and Mechanical Characterization of Shape Memory Alloy Ni-Ti-Ag Synthesized by Casting Route
Language: English
Abstract:

The purpose of the current research is to study the microstructure and mechanical properties of Ni-Ti-Ag shape memory alloys prepared by the casting route. Ag (grain size at 1 mm) was incorporated into Ni-Ti alloys at varying percentages of weight (0, 1.5, 3 and 4.5 wt.% Ag) to produce shape memory alloys using a Vacuum Arc Re-melting (VAR) furnace. Microstructural analysis was defined by FESEM microscopy and XRD examinations, while the transformation temperatures of the Ni-Ti-Ag shape memory alloy were determined by DSC examination. On the other hand, determination of mechanical properties was carried out using micro-hardness and compressive tests. The results of this work show that Ag was dispersed homogeneously into the Ni-Ti alloy. Moreover, two primary phases (austenite phase and martensite phase) emerged with few impurities. The results of the XRD examination show that the number of Ag peaks increased with the increase in weight percentage of Ag. The transformation temperature of the austenitic phase was defined as −1.6 ◦C by DSC. The mechanical characterizations increased with the increase in weight percentages of Ag (1.5, 3 and 4.5 wt.%), and significantly affected the mechanical properties of the Ni-Ti alloy. An improvement in compressive strength (42.478%) was found for the alloy with 3 wt.% Ag, while the micro-hardness results show a slight decrease in micro-hardness (8.858%) for the alloy with 4.5 wt.% Ag.

Journal or Publication Title: Applied Sciences
Volume of the journal: 12
Issue Number: 9
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 10 Seiten
Uncontrolled Keywords: shape memory alloys; Ni-Ti-Ag; casting; VAR furnace; microstructure; XRD; mechanical properties
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institut für Energiesysteme und Energietechnik (EST)
Date Deposited: 24 Aug 2022 12:22
Last Modified: 26 Aug 2022 09:46
DOI: 10.26083/tuprints-00022071
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-220716
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22071
PPN: 498633837
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