Effect of stress profile on microstructure evolution of cold-drawn commercially pure aluminum wire analyzed by finite element simulation

doi:10.1016/j.jmst.2017.07.011

Abstract

Abstract:

The evolution of microstructure in the drawing process of commercially pure aluminum wire (CPAW) does not only depend on the nature of materials, but also on the stress profile. In this study, the effect of stress profile on the texture evolution of the CPAW was systematically investigated by combining the numerical simulation and the microstructure observation. The results show that the tensile stress at the wire center promotes the formation of <111> texture, whereas the shear stress nearby the rim makes little contribution to the texture formation. Therefore, the <111> texture at the wire center is stronger than that in the surface layer, which also results in a higher microhardness at the center of the CPAW under axial loading.

Key words: Commercially pure aluminum wire, Cold drawing, Texture, Finite element simulation, Stress profile

Y.K. Zhu, Q.Y. Chen, Q. Wang, H.Y. Yu, R. Li, J.P. Hou, Z.J. Zhang, G.P. Zhang, Z.F. Zhang. Effect of stress profile on microstructure evolution of cold-drawn commercially pure aluminum wire analyzed by finite element simulation[J]. J. Mater. Sci. Technol., 2018, 34(7): 1214-1221.

Figures/Tables 10

Table 1 Diameter and area reduction of CPAW in each pass.

Pass	Diameter (mm)	Area reduction (%)
0	9.89	0
1	8.12	32.6
2	6.98	50.2
3	6.60	55.5
4	5.79	65.7
5	5.27	71.6
6	4.56	78.7
7	3.97	83.9
8	3.60	86.7
9	3.25	89.2

Fig. 1. Finite element model of wire in drawing die.

Fig. 2. Comparison of experimental stress-strain curves with simulated results.

Fig. 3. Orientation distribution of cold-drawn CPAWs for the 1 st pass (a, b), 4th pass (c, d), 7th pass (e, f), 9th pass (g, h) observed from drawing direction (DD) at center (a, c, e, g) and surface (b, d, f, h).

Fig. 4. Average grain size with different extrusion strains for sample surface and center.

Fig. 5. Micro-hardness measured from center to surface of samples processed by the 1st, 4th, 7th and 9th cold-drawing passes.

Fig. 6. Schematic diagrams for <100> (a) and <111> (b) slip systems.

Fig. 7. Major plastic deformation and corresponding stress profile during the 4th pass drawing: (a) longitudinal plastic deformation; (b) shear plastic deformation; (c) longitudinal stress; (d) shear stress.

Fig. 8. Longitudinal stress along radial direction (a) and percentage of high tensile stress region (b).

Fig. 9. Shear stress along radial direction.

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