Effect of Different Aging Processes on the Microstructure and Mechanical Properties of a Novel Al–Cu–Li Alloy
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2016年第10期
论文作者:Hongying Li Desheng Huang Wei Kang Jiaojiao Liu Yangxun Ou Dewang Li
文章页码:1049 - 1053
摘 要: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(Al5Cu6Mg2) and T1(Al2CuLi) 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’(Al2Cu) and T1 phases are detected. Only the T1 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.
Hongying Li1,2,Desheng Huang1,Wei Kang1,Jiaojiao Liu1,Yangxun Ou1,Dewang Li1
1. School of Materials Science and Engineering, Central South University2. Key Laboratory of Non-ferrous Materials, Ministry of Education, Central South University
摘 要: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(Al5Cu6Mg2) and T1(Al2CuLi) 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’(Al2Cu) and T1 phases are detected. Only the T1 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.
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