{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T14:02:51Z","timestamp":1760623371418,"version":"build-2065373602"},"reference-count":43,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2024,5,2]],"date-time":"2024-05-02T00:00:00Z","timestamp":1714608000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"University of Rijeka","award":["uniri-iskusni-tehnic-23-293"],"award-info":[{"award-number":["uniri-iskusni-tehnic-23-293"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>Shape memory alloys (SMAs) represent an exceptional class of smart materials as they are able to recover their shape after mechanical deformation, making them suitable for use in actuators, sensors and smart devices. These unique properties are due to the thermoelastic martensitic transformation that can occur during both thermal and mechanical deformation. Cu-based SMAs, especially those incorporating Al and Ag, are attracting much attention due to their facile production and cost-effectiveness. Among them, Cu-Al-Ag SMAs stand out due to their notably high temperature range for martensitic transformation. In this study, a Cu-based SMA with a new ternary composition of Cu-10Al-7Ag wt.% was prepared by arc melting and the samples cut from this casting alloy were quenched in water. Subsequently, the phase composition and the development of the microstructure were investigated. In addition, the morphology of the martensite was studied using advanced techniques such as electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The analyzes confirmed the presence of martensitic structures in both samples; mainly 18R (\u03b21\u2032) martensite was present but a small volume fraction of (\u03b31\u2032) martensite also was noticed in the as-quenched sample. The observation of fine, twinned martensite plates in the SMA alloy with symmetrically occurring basal plane traces between the twin variants underlines the inherent correlation between microstructural symmetry and the properties of the material and provides valuable insights into its behavior. The hardness of the quenched sample was found to be lower than the as-cast counterpart, which can be linked to the solutioning of Ag particles during the heat treatment.<\/jats:p>","DOI":"10.3390\/sym16050545","type":"journal-article","created":{"date-parts":[[2024,5,2]],"date-time":"2024-05-02T07:04:14Z","timestamp":1714633454000},"page":"545","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A Microstructural Study of Cu-10Al-7Ag Shape Memory Alloy in As-Cast and Quenched Conditions"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8714-6771","authenticated-orcid":false,"given":"Lovro","family":"Liveri\u0107","sequence":"first","affiliation":[{"name":"Faculty of Engineering & Centre for Micro- and Nanosciences and Technologies, University of Rijeka, Vukovarska 58, 51 000 Rijeka, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6564-7177","authenticated-orcid":false,"given":"Wojciech","family":"Sitek","sequence":"additional","affiliation":[{"name":"Scientific and Didactic Laboratory of Nanotechnology and Material Technologies, Faculty of Mechanical Engineering, Silesian University of Technology, 44-100 Gliwice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4108-0903","authenticated-orcid":false,"given":"Przemys\u0142aw","family":"Snopi\u0144ski","sequence":"additional","affiliation":[{"name":"Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, 44-100 Gliwice, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wojciech","family":"Maziarz","sequence":"additional","affiliation":[{"name":"Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymont Str., 30-059 Krakow, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tamara Holjevac","family":"Grguri\u0107","sequence":"additional","affiliation":[{"name":"School of Medicine, Catholic University of Croatia, Ilica 242, 10 000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,5,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1557\/s43578-021-00444-7","article-title":"Revisiting Cu-Based Shape Memory Alloys: Recent Developments and New Perspectives","volume":"37","author":"Mazzer","year":"2022","journal-title":"J. Mater. Res."},{"key":"ref_2","first-page":"747","article-title":"Precipitation Reaction in Alpha-Cu-Al-Ag Alloys","volume":"16","author":"Silva","year":"2011","journal-title":"Rev. Mat\u00e9ria V"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"664","DOI":"10.1016\/j.jallcom.2018.06.250","article-title":"The Effect of the Processing Parameters on the Martensitic Transformation of Cu-Al-Mn Shape Memory Alloy","volume":"765","author":"Kosec","year":"2018","journal-title":"J. Alloys Compd."},{"key":"ref_4","first-page":"1582","article-title":"Reconciling Viability and Cost-Effective Shape Memory Alloy Options\u2014A Review of Copper and Iron Based Shape Memory Metallic Systems","volume":"19","author":"Alaneme","year":"2016","journal-title":"Eng. Sci. Technol. Int. J."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"139441","DOI":"10.1016\/j.msea.2020.139441","article-title":"Exploring the Strength and Ductility Improvement of Cu\u2013Al Alloys","volume":"786","author":"Ren","year":"2020","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_6","unstructured":"Najah, S., and Al-Humairi, S. (2020). Recent Advancements in the Metallurgical Engineering and Electrodeposition, Springer."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Dobrza\u0144ski, L.A., Dobrza\u0144ski, L.B., Dobrza\u0144ska-Danikiewicz, A.D., and Dobrza\u0144ska, J. (2022). Nitinol Type Alloys General Characteristics and Applications in Endodontics. Processes, 10.","DOI":"10.3390\/pr10010101"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1233","DOI":"10.1007\/s10973-015-4654-5","article-title":"Characteristics of the Cu-18.84 at.%Al-10.28 at.%Mn-1.57 at.%Ag Alloy after Slow Cooling from High Temperatures","volume":"121","author":"Silva","year":"2015","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"680","DOI":"10.1016\/j.msea.2006.10.212","article-title":"Effect of Alloying on Microstructure and Shape Memory Characteristics of Cu\u2013Al\u2013Mn Shape Memory Alloys","volume":"481\u2013482","author":"Mallik","year":"2008","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"587","DOI":"10.1016\/j.jallcom.2016.05.303","article-title":"Phase Transformations and Aging of the Cu72.9Al15.0Mn10.5Ag1.6 Alloy","volume":"685","author":"Santos","year":"2016","journal-title":"J. Alloys Compd."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Liveri\u0107, L., Holjevac Grguri\u0107, T., Mandi\u0107, V., and Chulist, R. (2023). Influence of Manganese Content on Martensitic Transformation of Cu-Al-Mn-Ag Alloy. Materials, 16.","DOI":"10.3390\/ma16175782"},{"key":"ref_12","first-page":"153","article-title":"Effect of Silver Addition on Cu-Based Shape Memory Alloys","volume":"37","year":"2023","journal-title":"Chem. Biochem. Eng. Q."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"194","DOI":"10.1016\/j.matchar.2012.11.007","article-title":"Investigation of Thermal, Mechanical and Magnetic Behaviors of the Cu-11%Al Alloy with Ag and Mn Additions","volume":"75","author":"Silva","year":"2013","journal-title":"Mater. Charact."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1016\/j.jpcs.2017.01.012","article-title":"Phase Stability in the Cu-9 Wt%Al-10 Wt%Mn-3 Wt%Ag Alloy","volume":"104","author":"Santos","year":"2017","journal-title":"J. Phys. Chem. Solids"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"122343","DOI":"10.1016\/j.matchemphys.2019.122343","article-title":"Microstructure and Phase Stability of CuAlMnAgZr Multicomponent Alloys","volume":"241","author":"Pilz","year":"2020","journal-title":"Mater. Chem. Phys."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2007","DOI":"10.1007\/s10973-017-6584-x","article-title":"Spinodal Decomposition and Martensitic Transformation in Cu\u2013Al\u2013Mn Shape Memory Alloy","volume":"130","author":"Velazquez","year":"2017","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.msea.2003.10.346","article-title":"Phase Stability of CuAlMn Shape Memory Alloys","volume":"378","year":"2004","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"20150309","DOI":"10.1098\/rsta.2015.0309","article-title":"Elastocaloric Effect in CuAlZn and CuAlMn Shape Memory Alloys under Compression","volume":"374","author":"Qian","year":"2016","journal-title":"Philos. Trans. R. Soc. A Math. Phys. Eng. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1562","DOI":"10.1007\/s11665-016-1981-z","article-title":"Precipitation Effects on the Martensitic Transformation in a Cu-Al-Ni Shape Memory Alloy","volume":"25","author":"Suru","year":"2016","journal-title":"J. Mater. Eng. Perform."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"S805","DOI":"10.1016\/j.matpr.2015.07.404","article-title":"Effect of Thermal Cycling on CuAlAg Shape Memory Alloys","volume":"2","author":"Isalgue","year":"2015","journal-title":"Mater. Today Proc."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1007\/s10973-020-10002-8","article-title":"Thermal Behavior of As-Annealed CuAlMnAgZr Alloys","volume":"146","author":"Ferreira","year":"2021","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"33","DOI":"10.26850\/1678-4618eqj.v28.1.2003.p33-38","article-title":"Influence of the Al Content on the Phase Transformations in Cu-Al-Ag Alloys","volume":"28","author":"Adorno","year":"2003","journal-title":"Eclet. Quim."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Seifollahzadeh, P., Alizadeh, M., Szab\u00f3, \u00c1., Gubicza, J., and El-Tahawy, M. (2022). Microstructure and Mechanical Behavior of Cu\u2013Al\u2013Ag Shape Memory Alloys Processed by Accumulative Roll Bonding and Subsequent Annealing. Crystals, 12.","DOI":"10.3390\/cryst12081167"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"726","DOI":"10.1016\/j.msea.2006.02.089","article-title":"TEM Study on the Microstructure of Cu-Al-Ag Shape Memory Alloys","volume":"438\u2013440","author":"Guilemany","year":"2006","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"927","DOI":"10.1007\/s10973-011-1815-z","article-title":"Completeness of B-Phase Decomposition Reaction in Cu-Al-Ag Alloys","volume":"109","author":"Silva","year":"2012","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Krishna, T.S.V., and Rao, D.S. (2022). Effect of Aluminium on Microstructure and Shape Memory Effect in Cu-Al-Ag-Mn Shape Memory Alloys. Aust. J. Mech. Eng., 1\u201317.","DOI":"10.1080\/14484846.2022.2105467"},{"key":"ref_27","first-page":"293","article-title":"Effect of Mn Content on the Microstructure and Phase Transformation Temperatures of the Cu-Al-Mn-Ag Shape Memory Alloys","volume":"58","author":"Holjevac","year":"2020","journal-title":"Chem. Biochem. Eng. Q."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2037","DOI":"10.1016\/S1003-6326(11)60969-2","article-title":"Structure and Properties of Nanostructured Cu-13.2Al-5.1Ni Shape Memory Alloy Produced by Melt Spinning","volume":"21","author":"Izadinia","year":"2011","journal-title":"Trans. Nonferrous Met. Soc. China"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"2459","DOI":"10.1007\/s12666-021-02235-4","article-title":"Using High Speed High Pressure Torsion for Cu\u201313Al\u20134Ni Shape Memory Alloy Processing","volume":"74","author":"Gurau","year":"2021","journal-title":"Trans. Indian Inst. Met."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1080\/00325899.2016.1206261","article-title":"Influence of Quenching Methods on Martensitic Transformation and Mechanical Properties of P\/M Processed Cu\u2013Al\u2013Ni\u2013Ti Shape Memory Alloys","volume":"59","author":"Shafeeq","year":"2016","journal-title":"Powder Metall."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"119418","DOI":"10.1016\/j.actamat.2023.119418","article-title":"Unleashing Multi-Scale Mechanical Enhancement in NiTi Shape Memory Alloy via Annular Intra-Laser Deposition with Homogenized Ti2Ni Nanoprecipitates","volume":"262","author":"Yi","year":"2024","journal-title":"Acta Mater"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1016\/j.matlet.2013.03.014","article-title":"Effect of Thermal and Thermo-Mechanical Cycling on the Microstructure of Ni-Rich NiTi Shape Memory Alloys","volume":"99","author":"Suresh","year":"2013","journal-title":"Mater. Lett."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"S160","DOI":"10.1016\/j.jallcom.2013.11.155","article-title":"Ag-Rich Precipitates Formation in the Cu\u201311%Al\u201310%Mn\u20133%Ag Alloy","volume":"615","author":"Silva","year":"2014","journal-title":"J. Alloys Compd."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"106940","DOI":"10.1016\/j.compositesb.2019.106940","article-title":"Heat Treatment and Quenching Media Effects on the Thermodynamical, Thermoelastical and Structural Characteristics of a New Cu-Based Quaternary Shape Memory Alloy","volume":"174","author":"Canbay","year":"2019","journal-title":"Compos. B Eng."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"117598","DOI":"10.1016\/j.actamat.2021.117598","article-title":"Deformation Twinning with Different Twin-Boundary Mobility in 2H Martensite in Cu\u2013Ni\u2013Al Shape Memory Alloy","volume":"226","author":"Ge","year":"2022","journal-title":"Acta Mater."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"3643","DOI":"10.1016\/j.actamat.2005.04.013","article-title":"Elastic Constants of Bcc Austenite and 2H Orthorhombic Martensite in CuAlNi Shape Memory Alloy","volume":"53","author":"Seiner","year":"2005","journal-title":"Acta Mater."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"11","DOI":"10.15255\/KUI.2017.025","article-title":"The Effect of Heat Treatment on the Microstructure and Mechanical Properties of Cu-Al-Mn Shape Memory Alloy","volume":"67","author":"Kosec","year":"2018","journal-title":"Kem. U Ind."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1289","DOI":"10.1007\/s12666-015-0689-3","article-title":"Effect of Varying Al\/Mn Ratio on Phase Transformation in Cu\u2013Al\u2013Mn Shape Memory Alloys","volume":"69","author":"Jain","year":"2016","journal-title":"Trans. Indian Inst. Met."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/j.tca.2012.12.014","article-title":"Effect of Ag Addition on Phase Transitions of the Cu-22.26 at.%Al-9.93 at.%Mn Alloy","volume":"554","author":"Silva","year":"2013","journal-title":"Thermochim. Acta"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"167438","DOI":"10.1016\/j.jallcom.2022.167438","article-title":"Effect of Alloying Elements (Nb, Ag) on the Damping Performance of Cu\u2013Al\u2013Mn Shape Memory Alloys","volume":"930","author":"Wu","year":"2023","journal-title":"J. Alloys Compd."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"455","DOI":"10.1002\/pssa.2211190207","article-title":"Application of the Hall-Petch Relation to Microhardness Measurements on Al, Cu, Al-MD 105, and Al-Cu Alloys","volume":"119","author":"Taha","year":"1990","journal-title":"Phys. Status Solidi A"},{"key":"ref_42","first-page":"623","article-title":"Properties of Thermally Treated CuZn27Al3 Shape Memory Alloy","volume":"55","year":"2009","journal-title":"Stroj. Vestn. J. Mech. Eng."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/j.jallcom.2003.11.158","article-title":"Isothermal Decomposition Kinetics in the Cu\u20139%Al\u20134%Ag Alloy","volume":"375","author":"Adorno","year":"2004","journal-title":"J. Alloys Compd."}],"container-title":["Symmetry"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-8994\/16\/5\/545\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:38:40Z","timestamp":1760107120000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-8994\/16\/5\/545"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,5,2]]},"references-count":43,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2024,5]]}},"alternative-id":["sym16050545"],"URL":"https:\/\/doi.org\/10.3390\/sym16050545","relation":{},"ISSN":["2073-8994"],"issn-type":[{"type":"electronic","value":"2073-8994"}],"subject":[],"published":{"date-parts":[[2024,5,2]]}}}