{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T02:13:07Z","timestamp":1771553587189,"version":"3.50.1"},"reference-count":43,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,17]],"date-time":"2023-04-17T00:00:00Z","timestamp":1681689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Portuguese FCT","award":["UIDB\/04436\/2020"],"award-info":[{"award-number":["UIDB\/04436\/2020"]}]},{"name":"Portuguese FCT","award":["PD\/BD\/140094\/2018"],"award-info":[{"award-number":["PD\/BD\/140094\/2018"]}]},{"name":"doctoral","award":["UIDB\/04436\/2020"],"award-info":[{"award-number":["UIDB\/04436\/2020"]}]},{"name":"doctoral","award":["PD\/BD\/140094\/2018"],"award-info":[{"award-number":["PD\/BD\/140094\/2018"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The Mg-Al-Zn-Ca system has demonstrated excellent flame resistance and mechanical properties in the as-cast condition. However, the potential of these alloys to be heat-treated, e.g., by aging, as well as the influence of the initial microstructure on the precipitation kinetics, is yet to be comprehensively explored. Ultrasound treatment was applied during the solidification of an AZ91D-1.5%Ca alloy to promote microstructure refinement. Samples from treated and non-treated ingots were subjected to solution treatment at 415 \u00b0C for 480 min, followed by aging at 175 \u00b0C for up to 4920 min. The results showed that the ultrasound-treated material could reach the peak-age condition in a shorter period than the non-treated one, suggesting accelerated precipitation kinetics and, thus, enhanced aging response. However, the tensile properties showed a decrease in the peak age compared to the as-cast condition, probably due to the formation of precipitates at the grain boundaries that promote the formation of microcracks and intergranular early fracture. This research shows that tailoring the material\u2019s as-cast microstructure may positively affect its aging response, shortening the heat treatment duration, thereby making the process less expensive and more sustainable.<\/jats:p>","DOI":"10.3390\/ma16083152","type":"journal-article","created":{"date-parts":[[2023,4,17]],"date-time":"2023-04-17T02:02:59Z","timestamp":1681696979000},"page":"3152","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["On the Aging Kinetics of a Flame-Resistant AZ91D-1.5%Ca Magnesium Alloy Processed with Ultrasonic Vibration"],"prefix":"10.3390","volume":"16","author":[{"given":"In\u00eas V.","family":"Gomes","sequence":"first","affiliation":[{"name":"CMEMS\u2014UMinho, Department of Mechanical Engineering, Campus of Azur\u00e9m, University of Minho, 4800-058 Guimar\u00e3es, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8896-3386","authenticated-orcid":false,"given":"Fabrizio","family":"D\u2019Errico","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Politecnico di Milano, Via La Masa 34, 20156 Milan, Italy"}]},{"given":"Jos\u00e9 L.","family":"Alves","sequence":"additional","affiliation":[{"name":"CMEMS\u2014UMinho, Department of Mechanical Engineering, Campus of Azur\u00e9m, University of Minho, 4800-058 Guimar\u00e3es, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1121-6793","authenticated-orcid":false,"given":"H\u00e9lder","family":"Puga","sequence":"additional","affiliation":[{"name":"CMEMS\u2014UMinho, Department of Mechanical Engineering, Campus of Azur\u00e9m, University of Minho, 4800-058 Guimar\u00e3es, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4800-058 Guimar\u00e3es, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"22413","DOI":"10.1038\/s41598-020-79390-z","article-title":"Excellent age hardenability with the controllable microstructure of AXW100 magnesium sheet alloy","volume":"10","author":"Jo","year":"2020","journal-title":"Sci. Rep."},{"key":"ref_2","first-page":"2043","article-title":"Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling","volume":"26","author":"Han","year":"2021","journal-title":"J. Magnes. Alloys"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"10044","DOI":"10.1038\/s41598-020-67161-9","article-title":"A new magnesium sheet alloy with high tensile properties and room-temperature formability","volume":"10","author":"Shi","year":"2020","journal-title":"Sci. Rep."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1080\/21663831.2020.1719227","article-title":"Achieving extraordinary structural efficiency in a wrought magnesium rare earth alloy","volume":"8","author":"Panigrahi","year":"2020","journal-title":"Mater. Res. Lett."},{"key":"ref_5","first-page":"239","article-title":"Enhancing strength and ductility in back extruded WE71 magnesium alloy cylindrical parts by introduction of multi-direction forging process","volume":"5","author":"Bu","year":"2022","journal-title":"J. Rare Earths"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"141075","DOI":"10.1016\/j.msea.2021.141075","article-title":"Mg17Al12 phase refinement and the improved mechanical performance of Mg\u20136Al alloy with trace erbium addition","volume":"812","author":"Korgiopoulos","year":"2021","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"110146","DOI":"10.1016\/j.matchar.2020.110146","article-title":"Discontinuous and continuous precipitation characteristics and mechanical properties of a AZ80A magnesium alloy at different aging temperatures","volume":"161","author":"Zhang","year":"2020","journal-title":"Mater. Charact."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1775","DOI":"10.1016\/S1359-6454(00)00004-5","article-title":"TEM study of continuous precipitation in Mg \u00b19 wt%Al \u00b11 wt%Zn alloy","volume":"48","author":"Celotto","year":"2000","journal-title":"Acta Mater."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"86572","DOI":"10.1088\/2053-1591\/ab1ad6","article-title":"Microhardness and microstructure characteristics of AZ91 magnesium alloy under different cooling rate conditions","volume":"6","author":"Zahran","year":"2019","journal-title":"Mater. Res. Express"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"304","DOI":"10.1016\/j.actamat.2016.02.023","article-title":"Microplasticity-based rationalization of the room temperature yield asymmetry in conventional polycrystalline Mg alloys","volume":"108","year":"2016","journal-title":"Acta Mater."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.msea.2017.12.061","article-title":"Effects of homogenization time on aging behavior and mechanical properties of AZ91 alloy","volume":"714","author":"Lee","year":"2018","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_12","first-page":"1211","article-title":"Effect of heat treatment on the microstructure and mechanical properties of AZ80M magnesium alloy fabricated by wire arc additive manufacturing","volume":"32","author":"Guo","year":"2021","journal-title":"J. Magnes. Alloys"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"693","DOI":"10.1016\/j.rinp.2018.07.009","article-title":"Heat treatment and kinetics of precipitation of \u03b2-Mg17Al12 phase in AZ91 alloy","volume":"10","author":"Fatmi","year":"2018","journal-title":"Results Phys."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"111015","DOI":"10.1016\/j.matchar.2021.111015","article-title":"Quantitative relation of discontinuous and continuous Mg17Al12 precipitates with corrosion rate of AZ91D magnesium alloy","volume":"174","author":"Kim","year":"2021","journal-title":"Mater. Charact."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"7775","DOI":"10.1016\/j.msea.2010.08.052","article-title":"Growth kinetics of cellular precipitation in a Mg\u20138.5Al\u20130.5Zn\u20130.2Mn (wt.%) alloy","volume":"527","year":"2010","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3195","DOI":"10.1007\/s12540-020-00798-3","article-title":"Light-Alloy Melt Ultrasonication: Shorter T6 with Higher Precipitation Strengthening","volume":"27","author":"Puga","year":"2021","journal-title":"Met. Mater. Int."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2210","DOI":"10.3390\/met5042210","article-title":"Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy","volume":"5","author":"Puga","year":"2015","journal-title":"Metals"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1016\/j.scriptamat.2020.05.017","article-title":"Ultrasonic-induced excess vacancies in friction stir processing and exploration of acoustoplastic effect","volume":"185","author":"Hu","year":"2020","journal-title":"Scr. Mater."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1016\/j.ijmachtools.2017.04.008","article-title":"A fundamental investigation on ultrasonic vibration-assisted laser engineered net shaping of stainless steel","volume":"121","author":"Cong","year":"2017","journal-title":"Int. J. Mach. Tools Manuf."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Khorasani, M., Gibson, I., Ghasemi, A.H., Hadavi, E., and Rolfe, B. (2023). Laser subtractive and laser powder bed fusion of metals: Review of process and production features. Rapid Prototyp. J., ahead-of-print.","DOI":"10.1108\/RPJ-03-2021-0055"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jma.2022.12.007","article-title":"Development of high-strength magnesium alloys with excellent ignition-proof performance based on the oxidation and ignition mechanisms: A review","volume":"11","author":"Ni","year":"2023","journal-title":"J. Magnes. Alloys"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1572","DOI":"10.1016\/S1003-6326(21)65599-1","article-title":"Effect of Ca content and rheo-squeeze casting parameters on microstructure and mechanical properties of AZ91\u22121Ce\u2212xCa alloys","volume":"31","author":"Xiao","year":"2021","journal-title":"Trans. Nonferrous Met. Soc. China"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"133305","DOI":"10.1016\/j.matlet.2022.133305","article-title":"Ultrasound-assisted casting of AZ91D-1.5%Ca\u2014Shifting T4 paradigm for downstream processing","volume":"330","author":"Gomes","year":"2023","journal-title":"Mater. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"114","DOI":"10.1016\/j.jallcom.2010.08.139","article-title":"Effects of ultrasonic treatment on microstructure and tensile strength of AZ91 magnesium alloy","volume":"509","author":"Niroumand","year":"2011","journal-title":"J. Alloys Compd."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Chesonis, C. (2019). Light Metals, Springer.","DOI":"10.1007\/978-3-030-05864-7"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1188","DOI":"10.1007\/s11665-020-05419-z","article-title":"The Influence of High Temperature Ultrasonic Processing Time on the Microstructure and Mechanical Properties AZ91E Magnesium Alloy","volume":"30","author":"Emadi","year":"2021","journal-title":"J. Mater. Eng Perform"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"5018","DOI":"10.1016\/j.msea.2011.03.022","article-title":"The effect of Ca and RE elements on the precipitation kinetics of Mg17Al12 phase during artificial aging of magnesium alloy AZ91","volume":"528","author":"Mehrjoo","year":"2011","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.jallcom.2014.04.214","article-title":"Damping behaviors of as-cast and solution-treated AZ91\u2013Ca magnesium alloys","volume":"610","author":"Jun","year":"2014","journal-title":"J. Alloys Compd."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"3725","DOI":"10.1557\/jmr.2019.281","article-title":"Improvement of mechanical properties of extruded AZX912 magnesium alloy using high-temperature solution treatment","volume":"34","author":"Huang","year":"2019","journal-title":"J. Mater. Res."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"696","DOI":"10.1007\/s11661-007-9455-4","article-title":"Precipitation Strengthening of a Mg-Al-Ca\u2013Based AXJ530 Die-cast Alloy","volume":"39","author":"Suzuki","year":"2008","journal-title":"Met. Mat. Trans. A"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1007\/s11661-006-0019-9","article-title":"Precipitation hardening in Mg-Ca-Zn alloys","volume":"37A","author":"Bamberger","year":"2006","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"689","DOI":"10.1016\/j.actamat.2005.09.033","article-title":"Microstructural evolution of rheo-diecast AZ91D magnesium alloy during heat treatment","volume":"54","author":"Wang","year":"2006","journal-title":"Acta Mater."},{"key":"ref_33","first-page":"672","article-title":"Grain refinement impact on the mechanical properties and wear behavior of Mg-9Gd-3Y-2Zn-0.5Zr alloy after decreasing temperature reciprocating upsetting-extrusion","volume":"7","author":"Xu","year":"2021","journal-title":"J. Magnes. Alloys"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1039","DOI":"10.1016\/j.jmrt.2021.03.046","article-title":"Effects of post-heat treatment on microstructure, tensile properties, and bending properties of extruded AZ80 alloy","volume":"12","author":"Lee","year":"2021","journal-title":"J. Mater. Res. Technol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"416","DOI":"10.1016\/j.jmrt.2022.02.092","article-title":"Effect of solution annealing on microstructures and corrosion behavior of wire and arc additive manufactured AZ91 magnesium alloy in sodium chloride solution","volume":"18","author":"Zhang","year":"2022","journal-title":"J. Mater. Res. Technol."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1016\/j.jma.2017.12.001","article-title":"Influence of heat treatment on the machinability and corrosion behavior of AZ91 Mg alloy","volume":"6","author":"Dumpala","year":"2018","journal-title":"J. Magnes. Alloys"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1016\/j.jmst.2017.11.019","article-title":"Accelerated precipitation behavior of cast Mg-Al-Zn alloy by grain refinement","volume":"34","author":"Kim","year":"2018","journal-title":"J. Mater. Sci. Technol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"2333","DOI":"10.1016\/j.matlet.2006.09.007","article-title":"Microstructure and mechanical behaviour of semi-solid die-casting AZ91D magnesium alloy","volume":"61","author":"Du","year":"2007","journal-title":"Mater. Lett."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1016\/j.matdes.2016.03.014","article-title":"Development of non-flammable high strength AZ91 + Ca alloys via liquid forging and extrusion","volume":"99","author":"Li","year":"2016","journal-title":"Mater. Des."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Di, T., Jiang, Y., Guan, R., Chen, M., Jiang, J., Gao, F., Lu, X., and Zhao, Z. (2020). The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy. Metals, 10.","DOI":"10.3390\/met10091256"},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Teschke, M., Koch, A., and Walther, F. (2020). Comparison of High-Temperature Compression and Compression-Comp ressionFatigue Behavior of Magnesium Alloys DieMag422 and AE42. Materials, 13.","DOI":"10.3390\/ma13030497"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"344","DOI":"10.1016\/S0921-5093(01)01467-8","article-title":"Effects of solidification rate and ageing on the microstructure and mechanical properties of AZ91 alloy","volume":"325","author":"Davidson","year":"2002","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1016\/j.jallcom.2008.08.043","article-title":"Aging behaviour and precipitate morphologies in Mg\u20137.7Al\u20130.5Zn\u20130.3Mn (wt.%) alloy","volume":"476","author":"Lai","year":"2009","journal-title":"J. Alloys Compd."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/16\/8\/3152\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:17:04Z","timestamp":1760123824000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/16\/8\/3152"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,4,17]]},"references-count":43,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2023,4]]}},"alternative-id":["ma16083152"],"URL":"https:\/\/doi.org\/10.3390\/ma16083152","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,4,17]]}}}