J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (3): 534-540.DOI: 10.1016/j.jmst.2016.11.008
• Orginal Article • Previous Articles Next Articles
Lianghua Lin, Zhiyi Liu(), Wenjuan Liu, Yaru Zhou, Tiantian Huang
Received:
2016-07-14
Revised:
2016-10-17
Accepted:
2016-11-02
Online:
2018-03-20
Published:
2018-03-20
Lianghua Lin, Zhiyi Liu, Wenjuan Liu, Yaru Zhou, Tiantian Huang. Effects of Ag Addition on Precipitation and Fatigue Crack Propagation Behavior of a Medium-Strength Al-Zn-Mg Alloy[J]. J. Mater. Sci. Technol., 2018, 34(3): 534-540.
Alloy | Zn | Mg | Mn | Cr | Zr | Ti | Ag | Al |
---|---|---|---|---|---|---|---|---|
Al-Zn-Mg | 4.6 | 1.2 | 0.4 | 0.2 | 0.15 | 0.02 | / | Bal. |
Al-Zn-Mg-Ag | 4.6 | 1.2 | 0.4 | 0.2 | 0.15 | 0.02 | 0.2 | Bal. |
Table 1 Chemical composition (in wt%) of the alloys
Alloy | Zn | Mg | Mn | Cr | Zr | Ti | Ag | Al |
---|---|---|---|---|---|---|---|---|
Al-Zn-Mg | 4.6 | 1.2 | 0.4 | 0.2 | 0.15 | 0.02 | / | Bal. |
Al-Zn-Mg-Ag | 4.6 | 1.2 | 0.4 | 0.2 | 0.15 | 0.02 | 0.2 | Bal. |
Alloy | Aging treatment | Tensile strength | Yield strength | Elongation |
---|---|---|---|---|
σ (MPa) | σ0.2 (MPa) | δ (%) | ||
Al-Zn-Mg | One-step peak aging | 391 | 354 | 9.9 |
Two-step aging | 424 | 389 | 9.5 | |
Al-Zn-Mg-Ag | One-step peak aging | 442 | 392 | 10.3 |
Two-step aging | 458 | 411 | 9.6 |
Table 2 Influences of Ag addition and aging treatments on the tensile properties of Al-Zn-Mg alloys
Alloy | Aging treatment | Tensile strength | Yield strength | Elongation |
---|---|---|---|---|
σ (MPa) | σ0.2 (MPa) | δ (%) | ||
Al-Zn-Mg | One-step peak aging | 391 | 354 | 9.9 |
Two-step aging | 424 | 389 | 9.5 | |
Al-Zn-Mg-Ag | One-step peak aging | 442 | 392 | 10.3 |
Two-step aging | 458 | 411 | 9.6 |
Fig. 2. Representative bright field TEM micrographs showing the microstructures in (a) one-step aged Al-Zn-Mg alloy, (b, c) two step-aged Al-Zn-Mg alloy, (d) one-step aged Al-Zn-Mg-Ag alloy and (e, f) two-step aged Al-Zn-Mg-Ag alloy. (a, b) <100>Al zone axis, (c, d) <110>Al zone axis.
Fig. 3. HRTEM micrographs showing the presence of η′ phase in (a) Al-Zn-Mg alloy and (b) Al-Zn-Mg-Ag alloy after two-step aging. The marked sections of the region in (a) and (b) with high magnification are shown in (c) and (d) respectively. Images were taken along the <110>Al zone axis. The corresponding FFT spectrums are inserted.
Fig. 6. SEM fractographs of fatigue fracture surface for (a-c) Al-Zn-Mg and (d-f) Al-Zn-Mg-Ag alloys. (a, d) near threshold regime, (b, e) Paris regime with ΔK ≈ 25 MPa m0.5 and (c, f) final fatigue fracture surface. The crack propagation directions were all from top to bottom.
Fig. 7. SEM micrograph showing the inclusions (marked with arrow) in (a) Al-Zn-Mg and (b) Al-Zn-Mg-Ag alloys. The typical grain structures are inserted.
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