Suppressing Effect of Heat Treatment on the Portevin-Le Chatelier Phenomenon of Mg-4%Li-6%Zn-1.2%Y Alloy

doi:10.1016/j.jmst.2016.09.018

材料科学与技术 ›› 2016, Vol. 32 ›› Issue (12): 1232-1238.DOI: 10.1016/j.jmst.2016.09.018

收稿日期:2016-06-13 接受日期:2016-09-21 出版日期:2016-12-20 发布日期:2017-02-16

Suppressing Effect of Heat Treatment on the Portevin-Le Chatelier Phenomenon of Mg-4%Li-6%Zn-1.2%Y Alloy

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

¹ School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
² Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
³ Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
⁴ Shenzhen Institute, Shenzhen Key Lab Human Tissue Regenerate and Repair, Peking University, Shenzhen 518057, China

Received:2016-06-13 Accepted:2016-09-21 Online:2016-12-20 Published:2017-02-16
Contact: Xu D.K.

摘要/Abstract

Abstract:

Microstructural evolution and Portevin-Le Chatelier (PLC) phenomenon of the as-extruded Mg-4%Li-6%Zn-1.2%Y alloy before and after heat treatment have been investigated. It has been demonstrated that for the as-extruded and solid solution treated (T4) samples, the PLC phenomenon could be obviously observed on tensile stress-strain curves. Moreover, the PLC phenomenon in T4 samples was more salient than that in the as-extruded condition, suggesting that the occurrence of PLC phenomenon was closely related to the super-saturation degree of solute atoms in the matrix. Since most of solute atoms were consumed for the formation of MgZn precipitates (β₁′ and a little of β₂′) during the subsequent ageing treatment (T6), the PLC phenomenon of T6 samples was eliminated. Meanwhile, due to the pinning effect of the formed MgZn precipitates on mobile dislocations, the tensile strength of T6 samples was relatively higher than those of the other two conditions.

Key words: Mg-Li alloy, Heat treatment, Portevin-Le Chatelier (PLC) effect, Precipitates

. [J]. 材料科学与技术, 2016, 32(12): 1232-1238.

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.

图/表 9

Fig. 1. X-ray diffraction patterns of the Mg-4%Li-6%Zn-1.2%Y alloy under: (a) as-extruded, (b) T4 and (c) T6 conditions.

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. 3. DSC curve of the as-extruded Mg-4%Zn-6%Zn-1.2%Y alloy.

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.

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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Suppressing Effect of Heat Treatment on the Portevin-Le Chatelier Phenomenon of Mg-4%Li-6%Zn-1.2%Y Alloy

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