Datum
2019Autor
Popa, MihaiPricop, BogdanComaneci, Radu I.Gurau, GheorgheVollmer, MalteKrooß, PhilippNiendorf, ThomasBujoreanu, Leandru GheorgheSchlagwort
620 Ingenieurwissenschaften 660 Chemische Verfahrenstechnik, Technische Chemie Memory-LegierungPseudoelastizitätKornwachstumMechanische EigenschaftMetadata
Zur Langanzeige
Aufsatz
Processing effects on tensile superelastic behaviour of Fe43.5Mn34Al15 ± XNi7.5∓X shape memory alloys
Zusammenfassung
Fe₄₃.₅Mn₃₄Al₁₅Ni₇.₅ was introduced in the current decade as a new superelastic alloy with great applicative potential due to: (i) superelastic behaviour over a thermal range of 200°C and (ii) recoverable strains up to 9.7 %. One of the key factors in enhancing the superelastic response of several shape memory alloys (SMAs) is the formation of an oligocrystalline structure, i.e. without triple junctions between grains, which is the result of an abnormal grain growth (AGG) process that can be induced by cyclic heat treatment (CHT). Considering that, up to present date, no systematic observations were reported on the effects of Al substitution with Ni, the present study aims to analyse precisely these effects of on the structure and properties of Fe43.5Mn34Al15-xNi7.5+x, where x = 0; 1.5 and 3 at. %. The ingots with the five above mentioned compositions were: (i) cut by wire electrical discharge machining (WEDM); (ii) hot rolled (HR) at 1060°C with 43.7-70 % thickness reduction degrees; (iii) annealed (A) at 900°C/1h/water, (iv) cold rolled (CR) with 60-92.7 % thickness reduction degrees; (v) cut by WEDM under the configuration of tensile specimens; (vi) subjected to CHT between 1225 and 900°C with heating-cooling rates of 10°C/min (repeated three times) and final water cooling to 80°C before being subjected to (vii) final ageing (AT) at 200°C for 3 hours/water. After applying this complex thermomechanical procedure, the specimens were analysed by optical microscopy (OM) and the average diameter of crystalline grains was calculated based on dimensional measurements. Considering that the approximate specimen thickness was 1 mm, since the average grain size of thermomechanically treated specimens ranged between 1.3 and 3.7 mm, it can be concluded that oligocrystalline structure, characterized by grain size larger than specimen's thickness/diameter has been obtained. Tensile tests were performed on thermomechanically treated specimens, both up to failure and by loading-unloading. The evolution of average hardness, during the five processing stages, HR-A-CR-CHT and AT was determined and discussed.
Zitierform
In: IOP Conference Series: Materials Science and Engineering Volume 591 (2019) eissn:1757-899XZusätzliche Informationen
Creative Commons Attribution 3.0 licenceZitieren
@article{doi:10.17170/kobra-202305198049,
author={Popa, Mihai and Pricop, Bogdan and Comaneci, Radu I. and Gurau, Gheorghe and Vollmer, Malte and Krooß, Philipp and Niendorf, Thomas and Bujoreanu, Leandru Gheorghe},
title={Processing effects on tensile superelastic behaviour of Fe43.5Mn34Al15 ± XNi7.5∓X shape memory alloys},
journal={IOP Conference Series: Materials Science and Engineering},
year={2019}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2019$n2019 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/14722 3000 Popa, Mihai 3010 Pricop, Bogdan 3010 Comaneci, Radu I. 3010 Gurau, Gheorghe 3010 Vollmer, Malte 3010 Krooß, Philipp 3010 Niendorf, Thomas 3010 Bujoreanu, Leandru Gheorghe 4000 Processing effects on tensile superelastic behaviour of Fe43.5Mn34Al15 ± XNi7.5∓X shape memory alloys / Popa, Mihai 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/14722=x R 4204 \$dAufsatz 4170 5550 {{Memory-Legierung}} 5550 {{Pseudoelastizität}} 5550 {{Kornwachstum}} 5550 {{Mechanische Eigenschaft}} 7136 ##0##http://hdl.handle.net/123456789/14722
2023-05-19T07:10:35Z 2023-05-19T07:10:35Z 2019 doi:10.17170/kobra-202305198049 http://hdl.handle.net/123456789/14722 Creative Commons Attribution 3.0 licence eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ 620 660 Processing effects on tensile superelastic behaviour of Fe43.5Mn34Al15 ± XNi7.5∓X shape memory alloys Aufsatz Fe₄₃.₅Mn₃₄Al₁₅Ni₇.₅ was introduced in the current decade as a new superelastic alloy with great applicative potential due to: (i) superelastic behaviour over a thermal range of 200°C and (ii) recoverable strains up to 9.7 %. One of the key factors in enhancing the superelastic response of several shape memory alloys (SMAs) is the formation of an oligocrystalline structure, i.e. without triple junctions between grains, which is the result of an abnormal grain growth (AGG) process that can be induced by cyclic heat treatment (CHT). Considering that, up to present date, no systematic observations were reported on the effects of Al substitution with Ni, the present study aims to analyse precisely these effects of on the structure and properties of Fe43.5Mn34Al15-xNi7.5+x, where x = 0; 1.5 and 3 at. %. The ingots with the five above mentioned compositions were: (i) cut by wire electrical discharge machining (WEDM); (ii) hot rolled (HR) at 1060°C with 43.7-70 % thickness reduction degrees; (iii) annealed (A) at 900°C/1h/water, (iv) cold rolled (CR) with 60-92.7 % thickness reduction degrees; (v) cut by WEDM under the configuration of tensile specimens; (vi) subjected to CHT between 1225 and 900°C with heating-cooling rates of 10°C/min (repeated three times) and final water cooling to 80°C before being subjected to (vii) final ageing (AT) at 200°C for 3 hours/water. After applying this complex thermomechanical procedure, the specimens were analysed by optical microscopy (OM) and the average diameter of crystalline grains was calculated based on dimensional measurements. Considering that the approximate specimen thickness was 1 mm, since the average grain size of thermomechanically treated specimens ranged between 1.3 and 3.7 mm, it can be concluded that oligocrystalline structure, characterized by grain size larger than specimen's thickness/diameter has been obtained. Tensile tests were performed on thermomechanically treated specimens, both up to failure and by loading-unloading. The evolution of average hardness, during the five processing stages, HR-A-CR-CHT and AT was determined and discussed. open access Popa, Mihai Pricop, Bogdan Comaneci, Radu I. Gurau, Gheorghe Vollmer, Malte Krooß, Philipp Niendorf, Thomas Bujoreanu, Leandru Gheorghe doi:10.1088/1757-899X/591/1/012026 Memory-Legierung Pseudoelastizität Kornwachstum Mechanische Eigenschaft publishedVersion eissn:1757-899X IOP Conference Series: Materials Science and Engineering Volume 591 false 012026
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