J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 962-971.DOI: 10.1016/j.jmst.2018.12.023
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Li Liua, Jian-Tang Jiangab*(), Bo Zhanga, Wen-Zhu Shaoab, Liang Zhena*()
Received:
2018-10-13
Revised:
2018-11-29
Accepted:
2018-12-10
Online:
2019-06-20
Published:
2019-06-19
Contact:
Jiang Jian-Tang,Zhen Liang
About author:
1 These authors contributed equally to this work.
Li Liu, Jian-Tang Jiang, Bo Zhang, Wen-Zhu Shao, Liang Zhen. Enhancement of strength and electrical conductivity for a dilute Al-Sc-Zr alloy via heat treatments and cold drawing[J]. J. Mater. Sci. Technol., 2019, 35(6): 962-971.
Fig. 1. Metallographic photographs of the hot extruded Al-0.06Sc-0.23 Zr alloy: (a) ED-TD plane, (b) TD-ND plane, (c) ED-ND plane. ED, TD and ND stand for extrusion direction, traverse direction and normal direction, respectively.
Fig. 2. Bright-field TEM micrographs of the hot extruded Al-0.06Sc-0.23 Zr alloy: (a) fine recrystallized grains, (b) Al3(Sc,Zr) precipitates inside grain as indicated by red arrows.
Fig. 3. Microhardness and electrical conductivity evolution of Al-0.06Sc-0.23 Zr as a function of ageing time under different ageing treatments: (a), (c) one-stage ageing at 300 °C, (b), (d) two-stage ageing (first ageing at 300 °C for 25 h, then ageing at 400 °C for different times), the data for the first ageing stage is marked with red circle in (a) and (c).
Fig. 4. The mechanical properties of Al-0.06Sc-0.23 Zr at different ageing times during the secondary stage ageing at 400 °C after ageing 25 h at 300 °C.
Treatments | Yield strength (MPa) | Ultimate tensile strength (MPa) | Electrical conductivity (% IACS) |
---|---|---|---|
As-quench | 26.1 | 43.9 | 51.5 |
CD | 130.7 | 135.2 | 50.3 |
Peak ageing | 125.5 | 154.2 | 61.3 |
CD-A | 167.6 | 194.3 | 61.4 |
A-CD | 184.2 | 199.4 | 57.6 |
Table 1 The strengths and electrical conductivity of Al-0.06Sc-0.23 Zr under different processes.
Treatments | Yield strength (MPa) | Ultimate tensile strength (MPa) | Electrical conductivity (% IACS) |
---|---|---|---|
As-quench | 26.1 | 43.9 | 51.5 |
CD | 130.7 | 135.2 | 50.3 |
Peak ageing | 125.5 | 154.2 | 61.3 |
CD-A | 167.6 | 194.3 | 61.4 |
A-CD | 184.2 | 199.4 | 57.6 |
Fig. 6. TEM micrographs of Al-0.06Sc-0.23 Zr: (a) under one-stage ageing at 300 °C for 25 h, (c) under two-stage ageing at 300 °C for 25 h, then at 400 °C for 50 h, (b) and (d) the SAED patterns taken at [011] direction of Al matrix for (a) and (c), respectively; (e) HRTEM of Al3(Sc,Zr) precipitate taken at [011] direction of Al matrix after two-stage ageing, (f) its corresponding FFT image.
Fig. 7. (a) and (b) three-dimensional atom reconstruction of Al-0.06Sc-0.23 Zr after ageing at 300 °C for 25 h, displaying (a) Sc atoms, (b) Zr atoms, (c) proxigram of Al, Sc and Zr concentration in precipitates.
Fig. 8. Three-dimensional atom reconstruction of Al-0.06Sc-0.23 Zr under two-stage ageing (300 °C/25 h + 400 °C/50 h): (a) Sc atoms are displayed in red, (b) Zr atoms are in blue, (c) both Sc and Zr atoms are displayed and Al atoms are omitted for clarity, (d) proxigram of Al, Sc and Zr concentration in Al3(Sc,Zr) precipitates.
Fig. 9. Bright-field TEM micrographs of Al-0.06Sc-0.23 Zr under different processing paths: (a), (b) CD, (d), (e) CD-A path, recrystallized grains are marked with blue dashed lines in (d) and precipitates on dislocations are indicated by blue arrows in (e), (c), (f) the SAED patterns taken from [011] of Al matrix for CD and CD-A processed samples, respectively.
Fig. 10. Bright-field TEM micrographs of the A-CD processed Al-0.06Sc-0.23 Zr alloy under different treatments: (a), (d) before annealing, the drawing direction is indicated by red arrows, (b), (e) anneal at 250 °C for 5 h, (c), (f) anneal at 400 °C for 5 h, some recrystallized grains are marked by blue dashed lines in (c) and the pinning effect of precipitates are indicated by red arrows in (f).
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