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Synthesis of high strength aluminum alloys in the Al–Ni–La system

Published online by Cambridge University Press:  11 March 2014

Juan Mu ,
Pengfeng Sha ,
Zhengwang Zhu ,
Yandong Wang ,
Haifeng Zhang  and
Zhuangqi Hu
Juan Mu*
Affiliation:
Key Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, Shenyang 110004, China; and Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Pengfeng Sha
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Zhengwang Zhu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Yandong Wang
Affiliation:
Key Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, Shenyang 110004, China
Haifeng Zhang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Zhuangqi Hu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a)Address all correspondence to this author. e-mail: hfzhang@imr.ac.cn
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Abstract

High strength aluminum (Al) alloys were prepared by rapid solidification method in the Al–Ni–La system. Microstructural characterizations show that all the investigated Al–Ni–La alloys are comprised of Al, rod-like Al3Ni, and blocky Al11La3 phases, of which the size and volume fraction are composition-dependent. The Al85.5Ni9.5La5 (at.%) alloy shows the finest microstructure, which contributes to the highest strength along with considerable plasticity. The experimental analysis and finite element simulation (FES) show that the distribution of the intermetallic phases greatly affects the mechanical properties of the alloys. The rod-like Al3Ni phase precipitated with the locally uniform direction prevents the propagation of cracks and benefits the plastic deformation, whereas the blocky Al11La3 phase exhibits the nature of brittleness and acts as the origin of the microcrack initiation. These findings suggest a new method to design high strength Al alloys.

Keywords

aluminum alloyamorphous alloystrengthsimulation
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 5 , 14 March 2014 , pp. 708 - 717
Copyright
Copyright © Materials Research Society 2014 

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