Composition segregation behavior of 2219 aluminum alloy ingot with big size and effect of multi-axial forging and solution-aging treatment on microstructure and mechanical properties of ingot

被引：0

作者：

Xu D.-F. ^{[1
,2
]}

Chen S.-Y. ^{[1
]}

Yu F. ^{[3
]}

Chen K.-H. ^{[1
,3
]}

Liu D.-B. ^{[4
]}

机构：

[1] Light Alloy Research Institute, Central South University, Changsha

[2] Guilin University of Aerospace Technology, Guilin

[3] State Key Laboratory of Powder Metallurgy, Central South University, Changsha

[4] Beijing Institute of Astronautical Systems Engineering, Beijing

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2017年 / 27卷 / 12期

基金：

中国国家自然科学基金;

关键词：

2219; alloy; Composition segregation; Large-scale ingot; Mechanical properties; Microstructure evolution; Multidirectional forging-solution and aging treatment;

D O I：

10.19476/j.ysxb.1004.0609.2017.12.07

中图分类号：

学科分类号：

摘要：

The composition segregation behavior of 2219 aluminum alloy produced by ultrasonic semi-continuous ingot with diameter of 1250 mm and the effect of multi-axial forging and solution-aging on microstructure and mechanical properties of 2219 aluminum alloy were investigated by spectrograph, optical microscopy, scanning electron microscopy and tensile testing. The results show that the main alloy element along the radial of casting has serious segregation under the volatile cooling rate, which impels non-uniform distribution of non-equilibrium crystallization phase Al2Cu. The billet core has higher numbers of Al2Cu phase and dendrites are coarse. The non-equilibrium crystallization phase reduces gradually and the dendrites refines obviously from the core to the edge. After being treated by multi-stage homogenization and multidirectional forging-solution and aging treatment, the area between 2/3 and 5/6 of ingot radius has the best comprehensive mechanical properties with the tensile strength of 420 MPa (axial and radial directions) and 448 MPa (tangent direction), the yield strength of 323 MPa (axial and radial directions) and 343 MPa (tangent direction), and the elongation of 8.70% (axial and radial directions) and 11.0% (tangent direction). The main fracture mechanisms of 2219 alloy will make the transition from ductile fracture to brittle fracture along the radial of casting. Therefore, multidirectional forging-solution and aging treatment is an effective means to weaken the macro-segregation. © 2017, Science Press. All right reserved.

引用

页码：2451 / 2459

页数：8

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