Effects of Zinc and Calcium Concentration on the Microstructure and Mechanical Properties of Hot-Rolled Mg-Zn-Ca Sheets

doi:10.1007/s40195-016-0378-1

摘要/Abstract

Abstract:

Four kinds of Mg alloys with different Zn and Ca concentration were selected to analyze the effect of Zn and Ca concentration on the microstructure and the mechanical properties of Mg-Zn-Ca alloys. It was found that Zn and Ca concentration has a great influence on the volume fraction, the morphology and the size of second phase. The Mg-1.95Zn-0.75Ca (wt%) alloy with the highest volume fraction, continuous network and largest size of Ca₂Mg₆Zn₃ phase showed the lowest elongation to failure of about 7%, while the Mg-0.73Zn-0.12Ca (wt%) alloy with the lowest volume fraction and smallest size of Ca₂Mg₆Zn₃ phase showed the highest elongation to failure of about 37%. It was suggested that uniform elongations of the Mg-Zn-Ca alloys were sensitive to the volume fraction of the Ca₂Mg₆Zn₃ phases, especially the network Ca₂Mg₆Zn₃ phases; post-uniform elongations were dependent on the size of the Ca₂Mg₆Zn₃ phase, especially the size of network Ca₂Mg₆Zn₃ phase. Reduction in Zn and Ca concentration was an effective way to improve the room-temperature ductility of weak textured Mg-Zn-Ca alloys.

Key words: Mg-Zn-Ca, alloys, Ductility, Hot, rolling, Texture, Second, phase

. [J]. 金属学报英文版, 2016, 29(2): 205-216.

Jun Luo, Hong Yan, Nan Zheng, Rong-Shi Chen. Effects of Zinc and Calcium Concentration on the Microstructure and Mechanical Properties of Hot-Rolled Mg-Zn-Ca Sheets[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(2): 205-216.

图/表 10

Table 1 Analyzed chemical composition of the investigated alloys (wt%)

Alloy	Zn	Ca	Mg
ZX208	1.95	0.75	Bal
ZX203	1.95	0.22	Bal
ZX103	0.76	0.27	Bal
ZX101	0.73	0.12	Bal

Fig. 1 Optical microstructures of the ZX208 alloy a, ZX203 alloy b, ZX103 alloy c, ZX101 alloy d annealed at 350 &#x000b0;C for 1 h, respectively

Fig. 2 SEM microstructures of the ZX208 alloy a, e, ZX203 alloy b, f, ZX103 alloy c, g, ZX101 alloy d, h annealed at 350 &#x000b0;C for 1 h, respectively

Fig. 3 (0002) Pole figures of the ZX208 a, ZX203 b, ZX103 c, ZX101 d alloys annealed at 350 &#x000b0;C for 1 h, respectively

Fig. 4 Inverse pole figure a, microtexture b, Schmid factor for basal slip c of the ZX101 alloy annealed at 350 &#x000b0;C for 1 h

Fig. 5 Typical engineering stress-strain curves a; elongation to failure (E f), uniform elongation (E u) and post-uniform elongation (E pu) of the studied alloys b; the relationship between elongation to failure and Zn and Ca concentration of the Mg-Zn-Ca alloys c

Fig. 6 Fracture morphologies of tensile tested samples: a, e ZX208, b, f ZX203, c, g ZX103, d, h ZX101 alloys

Fig. 7 Backscattered electron images of the sheet surfaces of tensile tested samples: a, e ZX208, b, f ZX203, c, gZX103, d, h ZX101 alloys, respectively; Corresponding energy-dispersive X-ray spectra of points A, B and C indicated in images e-g

Fig. 8 Volume fractions of the second phase with different morphologies a, the average size of granular phase b of the studied alloys

Fig. 9 Work hardening rate curves of the studied alloys

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