Complex Precipitation Sequences of Al-Cu-Li-(Mg) Alloys Characterized in Relation to Thermal Ageing Processes

被引：38

作者：

Gao, Zhen ^{[1
]}

Chen, Jiang-Hua ^{[1
]}

Duan, Shi-Yun ^{[1
]}

Yang, Xiu-Bo ^{[1
]}

Wu, Cui-Lan ^{[1
]}

机构：

[1] Hunan Univ, Ctr High Resolut Electron Microscopy, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

来源：

ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2016年 / 29卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Al-Cu-Li alloy; Electron microscopy; Ageing; Precipitation; Strength; MICROSTRUCTURAL EVOLUTION; CRYSTAL-STRUCTURE; EARLY-STAGE; S-PHASE; LI; MG; STRENGTH; T-1;

D O I：

10.1007/s40195-016-0366-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The Al-Cu-Li-(Mg) alloy is a high-performance lightweight material strengthened by complex coexisting precipitates that form in the alloy upon thermal ageing. Using high-resolution (scanning) transmission electron microscopy in association with first-principles energy calculations, we systematically studied the complex coexisting precipitates in the alloys and correlated their precipitation sequences with thermal ageing processes applied. The principal results are the following: (1) eight types of precipitates can be observed in the alloy; (2) of these precipitates, the T-1-phase is most stable. The S-phase precipitates with segregated Li atoms at their interfacial edges are unexpectedly more stable than the sigma-phase; (3) the T-1-phase has a characteristic precursor that plays the key role in its nucleation and growth.

引用

页码：94 / 103

页数：10

共 38 条

[1] Cross C.E., 1983, P 2 INT AL LITH C MO, P675
[2] The influence of Cu/Li ratio on precipitation in Al-Cu-Li-x alloys
Decreus, B.
Deschamps, A.
De Geuser, F.
Donnadieu, P.
Sigli, C.
Weyland, M.
[J]. ACTA MATERIALIA, 2013, 61 (06) : 2207 - 2218
[3] Influence of Natural Ageing and Deformation on Precipitation in an Al-Cu-Li Alloy
Decreus, Benjamin
Deschamps, Alexis
de Geuser, Frederic
Sigli, Christophe
[J]. ADVANCED ENGINEERING MATERIALS, 2013, 15 (11) : 1082 - 1085
[4] Atomic structure of T1 precipitates in Al-Li-Cu alloys revisited with HAADF-STEM imaging and small-angle X-ray scattering
Donnadieu, P.
Shao, Y.
De Geuser, F.
Botton, G. A.
Lazar, S.
Cheynet, M.
de Boissieu, M.
Deschamps, A.
[J]. ACTA MATERIALIA, 2011, 59 (02) : 462 - 472
[5] Recent developments in advanced aircraft aluminium alloys
Dursun, Tolga
Soutis, Costas
[J]. MATERIALS & DESIGN, 2014, 56 : 862 - 871
[6] Combined electron beam imaging and ab initio modeling of T1 precipitates in Al-Li-Cu alloys
Dwyer, C.
Weyland, M.
Chang, L. Y.
Muddle, B. C.
[J]. APPLIED PHYSICS LETTERS, 2011, 98 (20)
[7] Characterization of the precipitates in Al-Li(8090) alloy using thermal measurements and TEM examinations
Gaber, A
Afify, N
[J]. PHYSICA B-CONDENSED MATTER, 2002, 315 (1-3) : 1 - 6
[8] Formation mechanism of precipitate T1 in AlCuLi alloys
Gao, Z.
Liu, J. Z.
Chen, J. H.
Duan, S. Y.
Liu, Z. R.
Ming, W. Q.
Wu, C. L.
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2015, 624 : 22 - 26
[9] STRUCTURE AND PROPERTIES DURING AGING OF AN ULTRA-HIGH STRENGTH AL-CU-LI-AG-MG ALLOY
GAYLE, FW
HEUBAUM, FH
PICKENS, JR
[J]. SCRIPTA METALLURGICA ET MATERIALIA, 1990, 24 (01): : 79 - 84
[10] Structure of age-hardened aluminium-copper alloys
Guinier, A
[J]. NATURE, 1938, 142 : 569 - 570

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