J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (5): 742-751.DOI: 10.1016/j.jmst.2018.11.013
• Orginal Article • Previous Articles Next Articles
J.P. Houad, R. Lib, Q. Wanga??(
), H.Y. Yub, Z.J. Zhanga, Q.Y. Chenb, H. Mab, X.M. Wuc, X.W. Lid, Z.F. Zhangad?()
Received:2018-08-29
Accepted:2018-10-04
Online:2019-05-10
Published:2019-02-20
Contact:
Wang Q.,Zhang Z.F.
About author:1 These authors contribute equally to this paper.
J.P. Hou, R. Li, Q. Wang, H.Y. Yu, Z.J. Zhang, Q.Y. Chen, H. Ma, X.M. Wu, X.W. Li, Z.F. Zhang. Three principles for preparing Al wire with high strength and high electrical conductivity[J]. J. Mater. Sci. Technol., 2019, 35(5): 742-751.
Fig. 1 TEM images of microstructure on axial section of B-CPAWs with different area reductions: (a) 0%; (b) 83.1%; (c) 90.2%. With the increase of area reduction, grains were gradually elongated along the axial direction.
Fig. 2 Grain evolution of CPAW with different area reductions. The grain length in A-CPAW is larger than that in B-CPAW, on the condition that the grain thicknesses maintain the same.
Fig. 3 Misorientation angle distributions of B-CPAWs with various area reductions: (a) 0%; (b) 83.1%; (c) 90.2%.
Fig. 4 Orientation distribution maps of B-CPAWs with various area reductions: (a) 0%; (b) 83.1%; (c) 90.2%. The scanning direction is parallel to the drawing direction (DD). It can be seen that the grains of <001> orientation gradually transformed into <111> orientation with the increasing area reduction.
Fig. 5 TEM images of aged Al-Mg-Si wire observed from (a, b) radial section and (c) axial section, (d) TEM image of as-received Al-Mg-Si wire observed from the radial section. Numerous nano-scale precipitates formed in the aged Al-Mg-Si wire.
Fig. 6 Strength-electrical conductivity relation of (a) CPAW and (b) Al-Mg-Si wire. The C-CPAW has higher electrical conductivity (EC) than the F-CPAW when they have the same yield strength (YS). The simultaneously improved strength and electrical conductivity was achieved by artificial aging.
| Material | Diameter of wire (mm) | Yield strength (MPa) | Ultimate tensile strength (MPa) | Electrical conductivity(%IACS) |
|---|---|---|---|---|
| B-CPAW in this work | 3.90 | 166.1 | - | 61.75 |
| B-CPAW in this work | 3.00 | 194.4 | - | 62.58 |
| A-CPAW in this work | 4.10 | 147.1 | - | 62.67 |
| A-CPAW in this work | 3.00 | 160.1 | - | 63.08 |
| Traditional CPAW in Ref. [ | 3.00 | 160 | - | 62.00 |
| As received Al-Mg-Si wire in this work | 3.15 | - | 342.2 | 49.36 |
| Aged Al-Mg-Si wire in this work | 3.15 | - | 352.3 | 55.97 |
| As received Al-Mg-Si wire in Ref. [ | 3.00 | - | 275.9 | 50.6 |
| Aged Al-Mg-Si wire in Ref. [ | 3.00 | - | 311.2 | 56.86 |
Table 1 Strength and electrical conductivity of Al wires in this work and collected from other references.
| Material | Diameter of wire (mm) | Yield strength (MPa) | Ultimate tensile strength (MPa) | Electrical conductivity(%IACS) |
|---|---|---|---|---|
| B-CPAW in this work | 3.90 | 166.1 | - | 61.75 |
| B-CPAW in this work | 3.00 | 194.4 | - | 62.58 |
| A-CPAW in this work | 4.10 | 147.1 | - | 62.67 |
| A-CPAW in this work | 3.00 | 160.1 | - | 63.08 |
| Traditional CPAW in Ref. [ | 3.00 | 160 | - | 62.00 |
| As received Al-Mg-Si wire in this work | 3.15 | - | 342.2 | 49.36 |
| Aged Al-Mg-Si wire in this work | 3.15 | - | 352.3 | 55.97 |
| As received Al-Mg-Si wire in Ref. [ | 3.00 | - | 275.9 | 50.6 |
| Aged Al-Mg-Si wire in Ref. [ | 3.00 | - | 311.2 | 56.86 |
Fig. 7 A sketch of interaction between electrons and the GBs in the CPAWs. The decreasing amount of GBV could reduce the electron scattering.
Fig. 8 Relation between texture evolution and texture strengthening: (a) volume fraction of <111> texture increases with area reduction; (b) texture strengthening effect increases with volume fraction of <111> texture.
Fig. 9 A qualitative illustration of relationships between increment in ultimate tensile strength (UTS) and electrical conductivity (EC) as precipitate radius increases (rc: radius of precipitate in peak aging Al-Mg-Si wire).
Fig. 10 Three principles for designing metallic materials with high strength and high electrical conductivity: (a) elongated grain and hard texture could lead to simultaneous increase of strength and electrical conductivity; (b) nano-scale precipitates precipitated from solute atoms result in precipitate strengthening and purification of matrix.
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