J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2246-2255.DOI: 10.1016/j.jmst.2018.05.003
• Orginal Article • Previous Articles Next Articles
Lei Xiao, Guangyu Yang*(), Yang Liu, Shifeng Luo, Wanqi Jie
Received:
2017-11-07
Revised:
2017-12-19
Accepted:
2018-02-08
Online:
2018-12-20
Published:
2018-11-15
Contact:
Yang Guangyu
Lei Xiao, Guangyu Yang, Yang Liu, Shifeng Luo, Wanqi Jie. Microstructure evolution, mechanical properties and diffusion behaviour of Mg-6Zn-2Gd-0.5Zr alloy during homogenization[J]. J. Mater. Sci. Technol., 2018, 34(12): 2246-2255.
Fig. 3. TEM observation in the as-cast Mg-6Zn-2Gd-0.5Zr alloy: (a, b) TEM bright field image and SAED pattern of the bone-like phase along [011] zone axis; (c, d) TEM bright field image and SAED pattern (along 5-fold zone axis) of the spherical phase.
Fig. 4. SEM image and EPMA maps of the solute elements distribution in the as-cast Mg-6Zn-2Gd-0.5Zr alloy: (a) SEM image; (b) Mg; (c) Zn; (d) Gd and (e) Zr.
Fig. 5. OM images of microstructure evolution in Mg-6Zn-2Gd-0.5Zr alloy after homogenization treatment under the different conditions at: (a) 465 °C for 2 h; (b) 465 °C for 8 h; (c) 465 °C for 16 h; (d) 465 °C for 24 h; (e) at 485 °C for 2 h; (f) 485 °C for 8 h; (g) 485 °C for 16 h; (h) 485 °C for 24 h; (i) at 505 °C for 2 h; (j) 505 °C for 8 h; (k) 505 °C for 16 h; (l) 505 °C for 24 h.
Fig. 6. (a) SEM image of the rod-like phase precipitated within α-Mg matrix in Mg-6Zn-2Gd-0.5Zr alloy after homogenization treatment at 505 °C for 16 h; (b) mapping of the element distributions of the red square in (a).
Fig. 7. TEM results of the rod-like phase: (a) TEM bright field image; (b) SAED pattern of the rod-like phase along [011] zone axis; (c) corresponding EDS spectra.
Fig. 9. Mechanical properties of Mg-6Zn-2Gd-0.5Zr alloy under different conditions of homogenization treatment: (a) tensile yield strength; (b) elongation.
Fig. 10. (a) Schematic diagram of microhardness testing position, (b) microhardness of the as-cast and homogenized (505 °C for 16 h) Mg-6Zn-2Gd-0.5Zr alloy.
Fig. 11. OM images of the longitudinal fracture section along the tensile axis: (a, b) the as-cast alloy; (c, d) homogenized at 505 °C for 16 h. (b, d) is enlarged from (a, c), respectively.
Fig. 12. SEM morphologies of the tensile fracture: (a-c) the as-cast Mg-6Zn-2Gd-0.5Zr alloy; (d, e) the sample homogenized at 505 °C for 16 h, and (f) EDS results of the point A and B in (c).
Fig. 13. (a) Segregation ratio as a function of homogenization time at different homogenization temperatures and corresponding three-dimensional morphologies of Mg-6Zn-2Gd-0.5Zr alloy in as-cast condition and 505 °C for 16 h and (b) variation of residual second phases as a function of homogenization time.
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