Meng Liu, Qianning Guo, Jingwei Zhao, Zhenshan Liu, Kaixin Chen, Yiheng Cao, Ting Chen, Feng Qian, Shiwei Pan, Xingzhong Cao, Huan Zhao, Gang Sha, Zi Yang, John Banhart, Pizhi Zhao
{"title":"增强预时效对Al-Mg-Si合金AA 6014中团簇和析出的调制","authors":"Meng Liu, Qianning Guo, Jingwei Zhao, Zhenshan Liu, Kaixin Chen, Yiheng Cao, Ting Chen, Feng Qian, Shiwei Pan, Xingzhong Cao, Huan Zhao, Gang Sha, Zi Yang, John Banhart, Pizhi Zhao","doi":"10.1016/j.actamat.2025.121164","DOIUrl":null,"url":null,"abstract":"The effect of an additional short spike aging treatment (SA: 180 to 220°C, in tens of seconds) between solution heat treatment and conventional pre-aging (PA: 85°C, in hours) on the mechanical properties of an AA 6014 alloy after paint baking was evaluated. Tensile tests show that such enhanced pre-aging including SA and PA can significantly improve the paint bake response compared to conventional pre-aging (PA only). To interpret this phenomenon, Positron Annihilation Lifetime Spectroscopy, Electrical Resistivity Measurements, Differential Scanning Calorimetry, Transmission Electron Microscopy, Atom Probe Tomography and MatCalc calculations were applied to identify the microstructural changes in different aging stages. It is found that the excess vacancies available after quenching assist in rapid nucleation of clusters during SA, which grow during subsequent PA and transform easily to β\" precipitates during paint baking owing to their similar chemistry. The densely distributed β\" precipitates are considered responsible for the improved paint bake strength as thy efficiently hinder dislocation movement.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"26 1","pages":""},"PeriodicalIF":8.3000,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Modulated clustering and precipitation in an Al–Mg–Si alloy AA 6014 via enhanced pre-aging\",\"authors\":\"Meng Liu, Qianning Guo, Jingwei Zhao, Zhenshan Liu, Kaixin Chen, Yiheng Cao, Ting Chen, Feng Qian, Shiwei Pan, Xingzhong Cao, Huan Zhao, Gang Sha, Zi Yang, John Banhart, Pizhi Zhao\",\"doi\":\"10.1016/j.actamat.2025.121164\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The effect of an additional short spike aging treatment (SA: 180 to 220°C, in tens of seconds) between solution heat treatment and conventional pre-aging (PA: 85°C, in hours) on the mechanical properties of an AA 6014 alloy after paint baking was evaluated. Tensile tests show that such enhanced pre-aging including SA and PA can significantly improve the paint bake response compared to conventional pre-aging (PA only). To interpret this phenomenon, Positron Annihilation Lifetime Spectroscopy, Electrical Resistivity Measurements, Differential Scanning Calorimetry, Transmission Electron Microscopy, Atom Probe Tomography and MatCalc calculations were applied to identify the microstructural changes in different aging stages. It is found that the excess vacancies available after quenching assist in rapid nucleation of clusters during SA, which grow during subsequent PA and transform easily to β\\\" precipitates during paint baking owing to their similar chemistry. The densely distributed β\\\" precipitates are considered responsible for the improved paint bake strength as thy efficiently hinder dislocation movement.\",\"PeriodicalId\":238,\"journal\":{\"name\":\"Acta Materialia\",\"volume\":\"26 1\",\"pages\":\"\"},\"PeriodicalIF\":8.3000,\"publicationDate\":\"2025-05-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Acta Materialia\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.actamat.2025.121164\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Materialia","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.actamat.2025.121164","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Modulated clustering and precipitation in an Al–Mg–Si alloy AA 6014 via enhanced pre-aging
The effect of an additional short spike aging treatment (SA: 180 to 220°C, in tens of seconds) between solution heat treatment and conventional pre-aging (PA: 85°C, in hours) on the mechanical properties of an AA 6014 alloy after paint baking was evaluated. Tensile tests show that such enhanced pre-aging including SA and PA can significantly improve the paint bake response compared to conventional pre-aging (PA only). To interpret this phenomenon, Positron Annihilation Lifetime Spectroscopy, Electrical Resistivity Measurements, Differential Scanning Calorimetry, Transmission Electron Microscopy, Atom Probe Tomography and MatCalc calculations were applied to identify the microstructural changes in different aging stages. It is found that the excess vacancies available after quenching assist in rapid nucleation of clusters during SA, which grow during subsequent PA and transform easily to β" precipitates during paint baking owing to their similar chemistry. The densely distributed β" precipitates are considered responsible for the improved paint bake strength as thy efficiently hinder dislocation movement.
期刊介绍:
Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.