Effect of Different Aging Processes on the Microstructure and Mechanical Properties of a Novel Al-Cu-Li Alloy

The effects of different aging processes on the microstructure and mechanical properties of a novel Al-Cu-Li alloy have been investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the tensile properties of a novel Al-Cu-Li alloy are sen...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 32; no. 10; pp. 1049 - 1053
Main Authors Li, Hongying, Huang, Desheng, Kang, Wei, Liu, Jiaojiao, Ou, Yangxun, Li, Dewang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2016
Subjects
Aging process
Al–Cu–Li alloy
Mechanical properties
Microstructure
X射线衍射
准解理断裂
力学性能
双级时效
时效工艺
显微组织
铜锂合金
铝锂合金
Mechanical properties
Microstructure
Aging process
Al–Cu–Li alloy
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ISSN1005-0302
1941-1162
DOI10.1016/j.jmst.2016.01.018

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Summary:The effects of different aging processes on the microstructure and mechanical properties of a novel Al-Cu-Li alloy have been investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the tensile properties of a novel Al-Cu-Li alloy are sensitive to aging processes, which correspond to different microstructures. σ（Al_5Cu_6Mg_2） and T_1（Al_2CuLi） phases are the major precipitates for the alloy in T6 aging condition（165 ℃/60 h）. After duplex aging condition（150 ℃/24 h ＋ 180 ℃/12 h）, σ, θ＇（Al_2Cu） and T_1 phases are detected. Only the T_1 phases can be found in the T8 state alloy（6% pre-strain＋135 ℃/60 h）. The failure modes of alloy in T6 and duplex aging conditions are dimple-intergranular fracture, while typical quasi-cleavage fracture in T8 condition.
Bibliography:The effects of different aging processes on the microstructure and mechanical properties of a novel Al-Cu-Li alloy have been investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the tensile properties of a novel Al-Cu-Li alloy are sensitive to aging processes, which correspond to different microstructures. σ（Al_5Cu_6Mg_2） and T_1（Al_2CuLi） phases are the major precipitates for the alloy in T6 aging condition（165 ℃/60 h）. After duplex aging condition（150 ℃/24 h ＋ 180 ℃/12 h）, σ, θ＇（Al_2Cu） and T_1 phases are detected. Only the T_1 phases can be found in the T8 state alloy（6% pre-strain＋135 ℃/60 h）. The failure modes of alloy in T6 and duplex aging conditions are dimple-intergranular fracture, while typical quasi-cleavage fracture in T8 condition.
21-1315/TG
Al-Cu-Li alloy Aging process Microstructure Mechanical properties
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2016.01.018