Double-action Die Compaction of Fe-Al Composite Powder- A Study by MPFEM Simulation

DOI

10.2991/ame-17.2017.21How to use a DOI?

Keywords

MPFEM modeling, particulate scale simulation, Fe and Al composite powders, double-action die compaction, densification mechanism

Abstract

To identify the densification process and corresponding mechanism, double-action die compaction of Fe-Al composite powder (with 20 wt.% Al) was modeled by multi-particle finite element method (MPFEM) from particulate scale in 2D. The initial packing structure generated by discrete element method (DEM) was input into FEM model where the mesh division of each particle was discretized. During compaction, macro and micro properties of the compacts were characterized and compared with those from single-action die compaction. The results show that with the same initial packing structure, double-action compaction can create dense compact with more uniform stress and relative density distributions at relatively low pressure. Densification mechanism analyses indicate that double-action compaction can more effectively improve the particle rearrangement to realize the dense packing structure compared with single action compaction when the pressure is low, in the former case large voids or pores have almost been eliminated, which is the precondition for the formation of high quality compact. With the increase of the pressure, further rearrangement and elastic and plastic deformation of Fe and Al particles can be observed; in this stage, the densification is mainly due to the plastic deformation of Al particles to fill their adjacent interstices. At high pressure, the compact shows bulk behavior, and some isolated enclosed pores are remained in the final compact. MPFEM simulation demonstrates that the final compact obtained in double-action compaction shows lower stresses/contact forces, and the stress distribution and particle deformation are more uniform.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jun-Wei Li
AU  - Xi-Zhong An
PY  - 2017/04
DA  - 2017/04
TI  - Double-action Die Compaction of Fe-Al Composite Powder- A Study by MPFEM Simulation
BT  - Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)
PB  - Atlantis Press
SP  - 119
EP  - 128
SN  - 2352-5401
UR  - https://doi.org/10.2991/ame-17.2017.21
DO  - 10.2991/ame-17.2017.21
ID  - Li2017/04
ER  -