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As a promising material to reduce fuel and energy consumption in future vehicle designs, there is an interest in understanding the impact of heat treatments on the damping capacity of this alloy. The Granato\u2013L\u00fccke theory is used to detail the forced vibration response in gravity cast A356. It is shown that a solution treatment enhances damping capacity in lower stress states (i.e., strain-independent regime) due to the increase in weak pinning length. However, in high-stress states (i.e., strain-dependent regime), peak-aged (T6) samples display higher damping capacity. This is proposed to be originated by releasing dislocations from weak pinning points, which start bowing in the precipitates that act as strong pinning points. Based on these results, it is shown for the first time that the selection of heat treatments to optimize damping in forced vibration is highly dependent on the expected stress\u2013strain state and must be considered in the design of cast components.<\/jats:p>","DOI":"10.3390\/met12050804","type":"journal-article","created":{"date-parts":[[2022,5,8]],"date-time":"2022-05-08T21:31:20Z","timestamp":1652045480000},"page":"804","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Influence of Precipitation Hardening on the Damping Capacity in Al\u2013Si\u2013Mg Cast Components at Different Strain Amplitudes"],"prefix":"10.3390","volume":"12","author":[{"given":"Vitor H.","family":"Carneiro","sequence":"first","affiliation":[{"name":"MEtRICs, Campus of Azur\u00e9m, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7799-4088","authenticated-orcid":false,"given":"Jos\u00e9","family":"Grilo","sequence":"additional","affiliation":[{"name":"CMEMS-UMinho, Campus of Azur\u00e9m, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1884-2380","authenticated-orcid":false,"given":"Delfim","family":"Soares","sequence":"additional","affiliation":[{"name":"CMEMS-UMinho, Campus of Azur\u00e9m, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8653-5126","authenticated-orcid":false,"given":"Isabel","family":"Duarte","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Centre for Mechanical Technology and Automation (TEMA), University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1121-6793","authenticated-orcid":false,"given":"H\u00e9lder","family":"Puga","sequence":"additional","affiliation":[{"name":"CMEMS-UMinho, Campus of Azur\u00e9m, 4800-058 Guimar\u00e3es, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"141443","DOI":"10.1016\/j.msea.2021.141443","article-title":"Effects of Ti Particles and T6 Heat Treatment on the Microstructure and Mechanical Properties of A356 Alloy Fabricated by Compocasting","volume":"818","author":"Azimi","year":"2021","journal-title":"Mater. 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