{"title":"Modulation of precipitation behavior by dislocations and alloying for superior strength-ductility balance in Al-Cu-Li alloys","authors":"Yuankang Xie, Shengdan Liu, Xiaobin Guo, Xiyu He, Chaojie Liang, Yunlai Deng","doi":"10.1016/j.jallcom.2024.177334","DOIUrl":null,"url":null,"abstract":"Conventional T8 heat treatment makes it difficult to achieve the strength and ductility trade-off of Al-Cu-Li alloys, and a feasible strategy to overcome this challenge in this work. Analyzing the microstructures and properties of different aging treatments shows that the transition of sliding dislocation from shear to difficult shear precipitates with increasing T<sub>1</sub> phase size is a major factor in reducing ductility. Effective control of the size of the T<sub>1</sub> phase was achieved by utilizing high dislocation density-assisted heterogeneous nucleation and simultaneous assisted diffusion means combined with precipitation competition between the S' and T<sub>1</sub> phases. Dislocation and alloying to tightly control precipitation after aging, the yield strength (650<!-- --> <!-- -->MPa) is significantly higher than that of T6 and T85 heat-treated alloys (150<!-- --> <!-- -->MPa and 30<!-- --> <!-- -->MPa), and most notably, the elongation reaches 13%. As a consequence, this study is of great significance for the development of high-performance Al-Cu-Li alloys for aerospace applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2024.177334","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Conventional T8 heat treatment makes it difficult to achieve the strength and ductility trade-off of Al-Cu-Li alloys, and a feasible strategy to overcome this challenge in this work. Analyzing the microstructures and properties of different aging treatments shows that the transition of sliding dislocation from shear to difficult shear precipitates with increasing T1 phase size is a major factor in reducing ductility. Effective control of the size of the T1 phase was achieved by utilizing high dislocation density-assisted heterogeneous nucleation and simultaneous assisted diffusion means combined with precipitation competition between the S' and T1 phases. Dislocation and alloying to tightly control precipitation after aging, the yield strength (650 MPa) is significantly higher than that of T6 and T85 heat-treated alloys (150 MPa and 30 MPa), and most notably, the elongation reaches 13%. As a consequence, this study is of great significance for the development of high-performance Al-Cu-Li alloys for aerospace applications.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.