高位错密度对Al-Cu-Li合金板材蠕变时效响应和力学性能的影响（英文）

被引：0

作者：

魏硕 ^{[1
,2
,3
]}

马培培 ^{[4
]}

陈龙辉 ^{[1
,2
,3
]}

杨建使 ^{[1
,2
,3
]}

湛利华 ^{[1
,2
]}

刘春辉 ^{[1
,2
,3
]}

机构：

[1] Light Alloy Research Institute, Central South University

[2] State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University

[3] School of Mechanical and Electrical Engineering, Central South University

[4] Advancd Research Center, Central South

来源：

Journal of Central South University | 2024年 / 31卷 / 07期

关键词：

蠕变时效; Al-Cu-Li合金; 高位错密度; 低温轧制; 位错强化;

D O I：

暂无

中图分类号：

TG146.21 [];

学科分类号：

摘要：

由于传统处理工艺下Al-Cu-Li合金的蠕变应变非常低，导致Al-Cu-Li合金壁板构件蠕变时效成形的难度大幅度增加。因此，提高Al-Cu-Li合金蠕变成形性是一个亟需解决的问题。本文详细地研究了低温下施加大预变形（LPD）和室温下施加大预变形对2195 Al-Cu-Li合金板材蠕变时效响应的影响。利用X射线衍射和透射电子显微镜揭示了LPD合金蠕变时效过程中的位错和析出相的演变规律。通过在液氮温度下进行轧制，获得了具有80%预变形且无边缘开裂的高质量2195合金板材。然而，板材在室温轧制过程中出现了严重的边缘开裂。此外，通过引入高位错密度(位错密度在1.4×1015 m-2以上)，2195 Al-Cu-Li合金的蠕变成形性和时效后的强度得到了协同提升。与传统的T3态合金相比，在160℃和150 MPa下，LPD合金的蠕变应变和时效后的强度分别提高了4～6倍和30～50 MPa，但是伸长率有所降低。LPD合金中位错多以位错缠结的组态存在，但是促进了细小T1相均匀析出。

引用

页码：2194 / 2209

页数：16

共 47 条

[21] Microstructure-sensitive modelling of dislocation creep in polycrystalline FCC alloys: Orowan theory revisited.[J].E.I. Galindo-Nava;C.M.F. Rae.Materials Science & Engineering A.2016,
[22] A unified constitutive model for asymmetric tension and compression creep-ageing behaviour of naturally aged Al-Cu-Li alloy.[J].Yong Li;Zhusheng Shi;Jianguo Lin;Yo-Lun Yang;Qi Rong;Bo-Ming Huang;Tsai-Fu Chung;Cheng-Si Tsao;Jer-Ren Yang;Daniel S. Balint.International Journal of Plasticity.2016,
[23] Cryogenic manufacturing processes
Jawahir, I. S.
Attia, H.
Biermann, D.
Duflou, J.
Klocke, F.
Meyer, D.
Newman, S. T.
Pusavec, F.
Putz, M.
Rech, J.
Schulze, V.
Umbrello, D.
[J]. CIRP ANNALS-MANUFACTURING TECHNOLOGY, 2016, 65 (02) : 713 - 736
[24] Quantification of the influence of increased pre-stretching on microstructure-strength relationships in the Al–Cu–Li alloy AA2195.[J].B.I. Rodgers;P.B. Prangnell.Acta Materialia.2016,
[25] Experimental investigation of tension and compression creep-ageing behaviour of AA2050 with different initial tempers.[J].Li Y.;Shi Z.;Lin J.;Yang Y. L.;Huang B. M.;Chung T. F.;Yang J. R..Materials Science & Engineering A.2016,
[26] Effect of age-forming on microstructure; mechanical and corrosion properties of a novel Al–Li alloy.[J].H.Y. Li;W. Kang;X.C. Lu.Journal of Alloys and Compounds.2015,
[27] Mechanical properties and surface characteristics of an AA6060 alloy strained in tension at cryogenic and room temperature.[J].Zebing Xu;Hans J. Roven;Zhihong Jia.Materials Science & Engineering A.2015,
[28] Effect of cryorolling on the mechanical properties of AA5083 alloy and the PortevinâLe Chatelier phenomenon.[J].K.S.V.B.R. Krishna;K. Chandra Sekhar;R. Tejas;N. Naga Krishna;K. Sivaprasad;R. Narayanasamy;K. Venkateswarlu.Materials & Design.2015,
[29] Cryogenic formability and deformation behavior of 2060 Al–Li alloys with water-quenched and T4 aged temper.[J].Dong Fei;Yi Youping;Huang Shiquan;Wang Bingxiang;He Hailin;Huang Ke;Wang Chenguang.Materials Science & Engineering A.2021,
[30] Cryogenic formability of a solution-treated aluminum alloy sheet at low temperatures.[J].Yuan Shijian;Cheng Wangjun;Liu Wei.Journal of Materials Processing Technology.2021, prepublish

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