Tuning strength and ductility of an Al-4.9 Mg-1.6Li-0.4Cu-0.3Sc-0.2Zr alloy via deep cold rolling and ageing treatment

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-25 DOI:10.1016/j.matchar.2025.115087

Zepeng Zha , Zhenqiang Wang , Yunpeng Cheng , Wenyuan Wang , Chunhong Zhang

{"title":"Tuning strength and ductility of an Al-4.9 Mg-1.6Li-0.4Cu-0.3Sc-0.2Zr alloy via deep cold rolling and ageing treatment","authors":"Zepeng Zha , Zhenqiang Wang , Yunpeng Cheng , Wenyuan Wang , Chunhong Zhang","doi":"10.1016/j.matchar.2025.115087","DOIUrl":null,"url":null,"abstract":"<div><div>The microstructural evolution, precipitation behavior, and mechanical properties of an Al-4.9 Mg-1.6Li-0.4Cu-0.3Sc-0.2Zr alloy, produced by deep cold rolling followed by ageing, were examined. As the ageing temperature increases from 95 °C to 165 °C, the peak ageing time of the alloy shortens, and the peak hardness decreases. A heterogeneous structure was observed at 130 °C or higher due to incomplete recrystallization. The homogeneously precipitated Al<sub>3</sub>Li (δ′) phase increase in size, but decrease in number density with increasing ageing temperature. The prominent precipitation strengthening resulting from δ′ phases leads to the highest strength (YS = 520 MPa, UTS = 582 MPa) observed at peak-ageing of 95 °C, whereas the alloy of peak-ageing at 165 °C showed the highest ductility (EL = 13.1 %) due to the heterogeneous structure. At 130 °C, a superior combination of strength (YS = 440 MPa, UTS = 530 MPa) and ductility (EL = 8.8 %) is achieved, which are the highest values among the Al-Mg-Li alloy families at present. The study provides a novel strategy to enhance the comprehensive mechanical properties of Al-Mg-Li alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115087"},"PeriodicalIF":4.8000,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Characterization","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1044580325003766","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}

引用次数: 0

Abstract

The microstructural evolution, precipitation behavior, and mechanical properties of an Al-4.9 Mg-1.6Li-0.4Cu-0.3Sc-0.2Zr alloy, produced by deep cold rolling followed by ageing, were examined. As the ageing temperature increases from 95 °C to 165 °C, the peak ageing time of the alloy shortens, and the peak hardness decreases. A heterogeneous structure was observed at 130 °C or higher due to incomplete recrystallization. The homogeneously precipitated Al₃Li (δ′) phase increase in size, but decrease in number density with increasing ageing temperature. The prominent precipitation strengthening resulting from δ′ phases leads to the highest strength (YS = 520 MPa, UTS = 582 MPa) observed at peak-ageing of 95 °C, whereas the alloy of peak-ageing at 165 °C showed the highest ductility (EL = 13.1 %) due to the heterogeneous structure. At 130 °C, a superior combination of strength (YS = 440 MPa, UTS = 530 MPa) and ductility (EL = 8.8 %) is achieved, which are the highest values among the Al-Mg-Li alloy families at present. The study provides a novel strategy to enhance the comprehensive mechanical properties of Al-Mg-Li alloys.

查看原文本刊更多论文

Al-4.9 Mg-1.6Li-0.4Cu-0.3Sc-0.2Zr合金深冷轧时效处理强度和延展性调优

研究了Al-4.9 Mg-1.6Li-0.4Cu-0.3Sc-0.2Zr深冷轧时效合金的组织演变、析出行为和力学性能。随着时效温度从95℃升高到165℃，合金的峰值时效时间缩短，峰值硬度降低。在130℃或更高温度下，由于不完全再结晶，观察到非均相结构。随着时效温度的升高，均匀析出的Al3Li （δ’）相尺寸增大，数量密度减小。在95℃峰时效时，δ′相析出强化作用显著，合金的强度最高（YS = 520 MPa, UTS = 582 MPa），而在165℃峰时效时，由于合金的非均相组织，合金的延展性最高（EL = 13.1%）。在130℃时，合金的强度（YS = 440 MPa, UTS = 530 MPa）和延展性（EL = 8.8%）均达到目前Al-Mg-Li合金族中最高。该研究为提高Al-Mg-Li合金的综合力学性能提供了一种新的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.