{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Li K"],"funding":["the National Natural Science Foundation of China"],"pagination":["6091"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC10532811"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["16(18)"],"pubmed_abstract":["Cu additions notably strengthen Al-Mg-Si and Al-Si-Mg alloys due to the dense precipitation of quaternary nano precipitates during ageing. However, the chemical evolution and mechanical behaviors of the quaternary micro-scale Q constituent phase occurring in cast and homogenized states have rarely been studied. Meanwhile, there exists a type of AlCuMgSi cluster in the cast state, which has been regarded as Q particles. The accurate identification of phase constituents is the basis for the future design of alloys with better performance. In our work, this type of cluster was revealed to consist of α-Al, θ-Al<sub>2</sub>Cu, Q, and Si phases through micro-to-atomic scale studies using scanning and transmission electron microscopes. The skeleton of the dendrite was θ phase. The second phases in the dendritic eutectic cluster dissolved quickly during a 4 h homogenization at 550 °C. The Q phase was found to effectively absorb the Fe impurities during casting and homogenization. As a result, the formation of other harmful Fe-rich intermetallics was suppressed. These Q constituent particles were observed to break into separate pieces in an intermediately brittle manner when compressed in situ in a scanning electron microscope. These findings provide insights into the thermodynamic modeling of the Al-Mg-Si-Cu system and alloy design."],"journal":["Materials (Basel, Switzerland)"],"pubmed_title":["Microstructure and Mechanical Behavior of Quaternary Eutectic α+θ+Q+Si Clusters in As-Cast Al-Mg-Si-Cu Alloys."],"pmcid":["PMC10532811"],"funding_grant_id":["51820105001","52071340"],"pubmed_authors":["Li Y","Song M","Yan Q","Li K","Lan X","Li L","Chen B","Lu Q","Yu Y"],"additional_accession":[]},"is_claimable":false,"name":"Microstructure and Mechanical Behavior of Quaternary Eutectic α+θ+Q+Si Clusters in As-Cast Al-Mg-Si-Cu Alloys.","description":"Cu additions notably strengthen Al-Mg-Si and Al-Si-Mg alloys due to the dense precipitation of quaternary nano precipitates during ageing. However, the chemical evolution and mechanical behaviors of the quaternary micro-scale Q constituent phase occurring in cast and homogenized states have rarely been studied. Meanwhile, there exists a type of AlCuMgSi cluster in the cast state, which has been regarded as Q particles. The accurate identification of phase constituents is the basis for the future design of alloys with better performance. In our work, this type of cluster was revealed to consist of α-Al, θ-Al<sub>2</sub>Cu, Q, and Si phases through micro-to-atomic scale studies using scanning and transmission electron microscopes. The skeleton of the dendrite was θ phase. The second phases in the dendritic eutectic cluster dissolved quickly during a 4 h homogenization at 550 °C. The Q phase was found to effectively absorb the Fe impurities during casting and homogenization. As a result, the formation of other harmful Fe-rich intermetallics was suppressed. These Q constituent particles were observed to break into separate pieces in an intermediately brittle manner when compressed in situ in a scanning electron microscope. These findings provide insights into the thermodynamic modeling of the Al-Mg-Si-Cu system and alloy design.","dates":{"release":"2023-01-01T00:00:00Z","publication":"2023 Sep","modification":"2025-04-05T09:42:39.998Z","creation":"2025-02-19T04:09:03.906Z"},"accession":"S-EPMC10532811","cross_references":{"pubmed":["37763370"],"doi":["10.3390/ma16186091"]}}