Open AccessThickness-dependent Strengthening Effect of Grain Refiner Al3Zr and Al3(Zr,Sc) in Al Alloys
Author(s) -
Chunmei Li,
Xianquan Jiang,
Ning Cheng,
Zhiqian Chen,
Jianfeng Tang
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/585/1/012027
Subject(s) - materials science , precipitation , alloy , phase (matter) , aluminium , metallurgy , zirconium , grain size , matrix (chemical analysis) , composite material , chemistry , physics , organic chemistry , meteorology
Grain refinement is an effective means to optimize the properties of the alloy. Al 3 Zr, Al 3 Sc and Al 3 (Zr,Sc) phases have attracted much attention as effective grain refiners for aluminum alloys, and their precipitation size will directly affect their interfacial strengthening effect with the matrix. In this paper, the first-principles method has been used to construct the Al/Al 3 Zr/Al double interface crystal model with different thicknesses of Al 3 Zr. The strengthening effect of the phase Al 3 Zr on the matrix during the precipitation growth process is described, and the optimal precipitation thickness of the strengthening phase Al 3 Zr is determined. By calculating the Griffith separation work and stress-strain curves of the interfaces between the refining phases with different thicknesses and the aluminum matrix, the change trend of the strengthening effect on the Al/Al 3 Zr/Al interface during Al 3 Zr precipitation growth is analyzed from the perspective of the combination of static and dynamic interface strength. Then the interfacial strengthening effect of the Sc-doped Al 3 (Zr,Sc) phase to Al matrix is analyzed. The electron density difference is used to analyze the interfacial bonding characteristics from the perspective of electronic bonding.