J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (4): 367-378.DOI: 10.1016/j.jmst.2016.02.013
• Orginal Article • Previous Articles Next Articles
Zhang Peng1, Li Zhenming1,*(), Liu Baoliang2, Ding Wenjiang1
Received:
2015-11-08
Revised:
2015-12-19
Accepted:
2016-01-22
Online:
2017-04-15
Published:
2017-05-24
Contact:
Li Zhenming
Zhang Peng, Li Zhenming, Liu Baoliang, Ding Wenjiang. Tensile Properties and Deformation Behaviors of a New Aluminum Alloy for High Pressure Die Casting[J]. J. Mater. Sci. Technol., 2017, 33(4): 367-378.
Fig. 1. Diagram of die casting for the standard tensile testing samples of cast aluminum alloy according to the specification defined in ASTM B557-06. Sample C cut from the Al-10Si-1.2Cu-0.7Mn alloy castings was used for tensile testing.
Si | Cu | Mn | Mg | Fe | Ti | Zn | Al |
---|---|---|---|---|---|---|---|
9.96 | 1.17 | 0.68 | ≤0.5 | ≤0.15 | ≤0.14 | ≤0.08 | Bal. |
Table 1 Actual chemical composition of the Al-10Si-1.2Cu-0.7Mn aluminum alloy (wt%)
Si | Cu | Mn | Mg | Fe | Ti | Zn | Al |
---|---|---|---|---|---|---|---|
9.96 | 1.17 | 0.68 | ≤0.5 | ≤0.15 | ≤0.14 | ≤0.08 | Bal. |
Fig. 3. (a) Microstructure of the tensile bar cross-section for the Al-10Si-1.2Cu-0.7Mn alloy sample showing band zone. High magnification images of location A (b), location B (c), and location C (d).
Fig. 4. (a) Detailed observation revealing that the alloy specimens contain a few massive phase particles (marked by the red arrows). EDS analysis of location A (b) and location B (c) in image (a), and XRD curve of the Al-10Si-1.2Cu-0.7Mn alloy (d).
Locations | Axis length (μm) | Ratio of major axis/minor axis | Fraction of α-Al (%) | ||
---|---|---|---|---|---|
Major (d1) | Minor (d2) | Mean | |||
Outside of defect band | 7.5 | 5.6 | 6.5 | 1.34 | 61.5 |
Defect band | 8.9 | 6.6 | 7.8 | 1.35 | 62.3 |
Inside of defect band | 10.7 | 7.9 | 9.3 | 1.35 | 68.9 |
Table 2 Average axis length and area proportion of α-Al in the Al-10Si-1.2Cu-0.7Mn alloy
Locations | Axis length (μm) | Ratio of major axis/minor axis | Fraction of α-Al (%) | ||
---|---|---|---|---|---|
Major (d1) | Minor (d2) | Mean | |||
Outside of defect band | 7.5 | 5.6 | 6.5 | 1.34 | 61.5 |
Defect band | 8.9 | 6.6 | 7.8 | 1.35 | 62.3 |
Inside of defect band | 10.7 | 7.9 | 9.3 | 1.35 | 68.9 |
Fig. 6. Numerical flow simulation images of thermal field (a) and volume fraction of entrained air (b) based on Flow-3D analysis software showing the band zone formation process.
Fig. 7. (a) Hardness evolution as a function of aging time (h) during nature aging (RT) and (b) tensile properties of the Al-10Si-1.2Cu-0.7Mn alloy, as a function of natural aging time (RT).
Time (h) | Symbol | YS (MPa) | UTS (MPa) | A (%) |
---|---|---|---|---|
2 | A1 | 167 | 267 | 11.1 |
72 | A2 | 184 | 312 | 10.6 |
144 | A3 | 189 | 328 | 10.1 |
1200 | A4 | 206 | 331 | 9.8 |
17,280 | A5 | 211 | 342 | 7.2 |
Table 3 Tensile properties of the Al-10Si-1.2Cu-0.7Mn alloy with different natural aging time
Time (h) | Symbol | YS (MPa) | UTS (MPa) | A (%) |
---|---|---|---|---|
2 | A1 | 167 | 267 | 11.1 |
72 | A2 | 184 | 312 | 10.6 |
144 | A3 | 189 | 328 | 10.1 |
1200 | A4 | 206 | 331 | 9.8 |
17,280 | A5 | 211 | 342 | 7.2 |
Fig. 8. (a) Relationship between the hardness (HV5) and the ultimate tensile strength (σb) of the Al-10Si-1.2Cu-0.7Mn alloy for different natural aging time and (b) comparison between the data based on hardness prediction and the experiment results about the ultimate tensile strength of the alloy.
Test temperature (°C) | Symbol | YS (MPa) | UTS (MPa) | A (%) |
---|---|---|---|---|
-70 | B1 | 207 | 302 | 9.9 |
20 | B2 | 206 | 331 | 9.8 |
150 | B3 | 183 | 277 | 11.3 |
200 | B4 | 180 | 241 | 12.9 |
250 | B5 | 148 | 181 | 14.7 |
300 | B6 | 111 | 138 | 18.1 |
350 | B7 | 70 | 78 | 26.6 |
Table 4 Tensile properties of the Al-10Si-1.2Cu-0.7Mn alloy tested at different temperatures
Test temperature (°C) | Symbol | YS (MPa) | UTS (MPa) | A (%) |
---|---|---|---|---|
-70 | B1 | 207 | 302 | 9.9 |
20 | B2 | 206 | 331 | 9.8 |
150 | B3 | 183 | 277 | 11.3 |
200 | B4 | 180 | 241 | 12.9 |
250 | B5 | 148 | 181 | 14.7 |
300 | B6 | 111 | 138 | 18.1 |
350 | B7 | 70 | 78 | 26.6 |
Fig. 10. (a) Effect of natural aging time on true stress-logarithmic strain curves of the Al-10Si-1.2Cu-0.7Mn alloy (A1 - 2 h, A2 - 72 h, A3 - 144 h, A4 - 1200 h and A5 - 17,280 h). (b) The magnified curve of location B in (a) showing the Portevin-Le Chatelier effect. σ1 is stress drop amplitude, σ2 is stress increase amplitude; t1is stress decrease time, t2 is reloading time. (c) True stress-logarithmic plastic strain curves showing the effect of natural aging time on flow behavior of the alloy. (d) Strain-hardening rate measured at a plastic strain of 0.0015, as function of natural aging time for the alloy. (e) Determination of n and k values for the alloys tested at different natural aging time by linear fit to the log (true stress)-log (logarithmic plastic strain) curves. The true plastic strain ranges from about 0.01 up to instability. (f) n and (g) k measured at a logarithmic plastic strain range from about 0.01 up to instability, as function of natural aging time for the alloy.
Fig. 11. (a) Effect of test temperature on true stress-logarithmic strain curves of the Al-10Si-1.2Cu-0.7Mn alloy (B1: -70 °C, B2: 20 °C, B3: 150 °C, B4: 200 °C, B5: 250 °C, B6: 300 °C and B7: 350 °C). (b) The magnified curve of location B in (a) showing the Portevin-Le Chatelier effect. (c) True stress-logarithmic plastic strain curves showing the effect of test temperature on flow behavior of the alloy. (d) Strain-hardening rate measured at a plastic strain of 0.0015, as function of test temperatures for the alloy. (e) Determination of nand k values for the alloys tested at different test temperatures by linear fit to the log (true stress)-log (logarithmic plastic strain) curves. The logarithmic plastic strain ranges from about 0.01 up to instability. (f)n and (g) k measured at a logarithmic plastic strain range from about 0.01 up to instability, as function of test temperatures for the alloys.
Fig. 12. SEM fractographs showing the effect of test temperature on the fracture in the Al-10Si-1.2Cu-0.7Mn alloy: (a, b) 20 °C; (c, d) 150 °C; (e, f) 300 °C. The Alx(Fe, Mn)ySiz phase particles and Si eutectic particles are marked by red and blue arrows, respectively.
Fig. 14. Tensile instability plots for the Al-10Mg-1.2Cu-0.7Mn alloy for different natural aging time and tested at different test temperatures: (a) A1 - 2 h, A2 - 72 h, A3 - 144 h, A4 - 1200 h and A5 - 17,280 h; (b) B1: -70 °C, B3: 150 °C, B4: 200 °C, B5: 250 °C, B6: 300 °C and B7: 350 °C.
Fig. 15. Ratio of tensile instability strain εi to fracture strain εf of the Al-10Si-1.2Cu-0.7Mn alloy for different natural aging time (a) and tested at different test temperatures (b). εi/εf > 1 indicates that local fracture governs tensile instability, while εi/εf < 1 indicates more uniform damage accumulation where tensile instability occurs at the onset macroscopic necking.
Fig. 16. Macroscpic tensile fracture features of the Al-10Si-1.2Cu-0.7Mn alloy tested at different temperatures (B2: 20 °C, B3: 150 °C, B4: 200 °C, B5: 250 °C, B6: 300 °C and B7: 350 °C).
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