Transactions of Materials and Heat Treatment

Title：Influences of microalloying on tensile properties and microstructure of alloy Al-Cu-Li-Zr

Authors： Zhang Jian1 Ma Yunlong2 Li Jinfeng1 Zhu Ruihua1 Liu Qing1 Xiang Sheng1 Zheng Ziqiao1

Unit： 1.Central South University 2.Beijing Institute of

KeyWords： Al-Li alloy microstructure tensile properties microalloying

ClassificationCode：

year,vol(issue):pagenumber：2015,40(7):131-135

Abstract：

Influences of microalloying Mg, Zn, Mn on tensile properties and microstructure of alloy Al-Cu-Li-Zr were investigated by tensile test and TEM observation. Results show that compared with base alloy, the microalloying Mg, Zn, Mn alloy Al-3.1Cu-2.1Li-0.1Zr has higher strength after T6 aging, whose peak is improved by about 40 MPa. And the aging response of microalloying alloy is faster under T8 condition. Meanwhile, the anisotropy index of the strength of microalloyed alloy is lower. The main precipitated phases of alloy Al-Cu-Li-Zr increase for δ′, T1 and decrease for θ′. During T6 aging, the precipitated densities of δ′, T1 and θ′ are obviously improved by adding micro alloy, meanwhile less S′ phase is observed. During T8 aging, more disperse phases of δ′, T1 are effectively precipitated by adding microalloying elements.

Funds：

国家高技术研究发展计划（863计划）资助项目（2013AA032401）

张健（1990-），男，硕士研究生

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