J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (12): 1232-1238.DOI: 10.1016/j.jmst.2016.09.018
• Orginal Article • Previous Articles Next Articles
Li C.Q.1,2,3,Xu D.K.2,3,*(),Wang B.J.3,Sheng L.Y.4,Han E.H.1,2,3
Received:
2016-06-13
Accepted:
2016-09-21
Online:
2016-12-20
Published:
2017-02-16
Contact:
Xu D.K.
Li C.Q.,Xu D.K.,Wang B.J.,Sheng L.Y.,Han E.H.. Suppressing Effect of Heat Treatment on the Portevin-Le Chatelier Phenomenon of Mg-4%Li-6%Zn-1.2%Y Alloy[J]. J. Mater. Sci. Technol., 2016, 32(12): 1232-1238.
Fig. 2. Microstructural analyses of the alloy before and after heat treatment: (a-c) SEM images of the as-extruded, T4 and T6 samples; (d-f) OM images of the as-extruded, T4 and T6 samples. The inserted images in images (a-c) are high-magnification observations to the squared areas.
Fig. 4. TEM results of the alloy before and after heat treatment: (a), (c) and (e) TEM bright field images; (b), (d) and (f) selected area diffraction patterns (SADPs) of the as-extruded, T4 and T6 samples, respectively. Image (b) is SADPs of α-Mg matrix, image (d) is 5-fold SADPs of I-phase, and image (f) is SADPs of α-Mg matrix plus β1′ precipitates.
Fig. 5. Stress-strain curves of differently treated samples tested at room temperature with a strain rate of 1 × 10-3 s-1. The inserted images are high-magnification observations to the squared areas.
Samples | YS (MPa) | UTS (MPa) | EL (%) |
---|---|---|---|
As-extruded | 141 ± 5 | 230 ± 5 | 18.8 ± 3 |
T4 | 133 ± 5 | 210 ± 5 | 24.4 ± 3 |
T6 | 146 ± 5 | 241 ± 5 | 11.0 ± 3 |
Table 1. Tensile properties of Mg-4%Li-6%Zn-1.2%Y alloy before and after heat treatment
Samples | YS (MPa) | UTS (MPa) | EL (%) |
---|---|---|---|
As-extruded | 141 ± 5 | 230 ± 5 | 18.8 ± 3 |
T4 | 133 ± 5 | 210 ± 5 | 24.4 ± 3 |
T6 | 146 ± 5 | 241 ± 5 | 11.0 ± 3 |
Fig. 6. Static strain ageing (SSA) results of: (a) as-extruded, (b) T4 and (c) T6 samples tested at room temperature with a strain rate of 1 × 10-3 s-1.
Fig. 7. Failure analyses of tensile tested samples: images (a-c) are fracture surfaces of as-extruded, T4 and T6 samples, respectively; images (d-f) are the SEM observations to surfaces 1 mm from the tensile fracture of as-extruded, T4 and T6 samples, respectively; images (g-i) are OM observations to the polished surfaces 1 mm from the tensile fracture of as-extruded, T4 and T6 samples, respectively.
Fig. 8. TEM results and schematic models of deformation mechanisms occurred in differently treated samples: images (a, b) are bright field images of dislocation structure in T4 and T6 samples with total strain of 6%, respectively; images (c, d) are schematic illustration of micro deformation mechanisms for causing and suppressing the PLC phenomenon in T4 and T6 samples, respectively.
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