A High-Ductility Mg-Zn-Ca Magnesium Alloy

doi:10.1007/s40195-018-0804-7

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (1): 23-30.DOI: 10.1007/s40195-018-0804-7

Special Issue: 2019年镁合金专辑

• Orginal Article • Previous Articles Next Articles

A High-Ductility Mg-Zn-Ca Magnesium Alloy

Teng Tu¹, Xian-Hua Chen^1,²(), Jiao Chen¹, Chao-Yue Zhao¹, Fu-Sheng Pan^2,³

1.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
2.National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400045, China
3.Chongqing Academy of Science and Technology, Chongqing 401123, China

Received:2018-04-28 Revised:2018-07-19 Online:2019-01-10 Published:2019-01-18
Contact: Chen Xian-Hua
About author:
Author brief introduction:Dao-Kui Xu Professor of IMR, CAS, and “Young Merit Scholar” of Corrosion Center in the Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS). He achieved Ph.D. degree from IMR, CAS, in 2008, during which he obtained “Chinese Academy of Sciences-BHP Billiton” Scholarship award, “Shi Changxu” Scholarship award and “Zhu-LiYueHua” Excellent Doctorate Student Scholarship of Chinese Academy of Sciences. He worked as a Research Fellow in ARC Center of Excellence, Design of Light Metals, Department of Materials Engineering, Monash University, Australia (2008.10-2011.10). He published more than 60 peer-reviewed scientific papers, attended 20 invited lectures and holds seven patents. His papers were cited more than 1200 times. His research interests mainly include: (1) fatigue behavior and fracture toughness of light metals, such as Mg, Al and Ti alloys; (2) effects of alloying, heat treatment and thermomechanical processes on the microstructural evolution and mechanical improvement of light metals; (3) corrosion, stress corrosion cracking and corrosion fatigue behavior of lightweight alloys; and (4) design of new lightweight alloys with a good balance of properties in terms of mechanical property and corrosion resistance.

Abstract

Abstract:

A new kind of Mg-2Zn-0.6Ca (wt%) alloy was fabricated by casting and hot extrusion as a high-ductility structural material. The extruded alloy exhibits a superior elongation of ~30%, yield strength of 130 MPa and ultimate tensile strength of 280 MPa along the extrusion direction at room temperature. Microstructure, texture and tensile properties of the extruded alloy were investigated in details. The remarkable improvement of ductility is ascribed to the weakened basal texture, refined grains and a small number of second phase in the alloy.

Key words: Magnesium alloy, Mg-Zn-Ca, High ductility, Extrusion, Texture

Teng Tu, Xian-Hua Chen, Jiao Chen, Chao-Yue Zhao, Fu-Sheng Pan. A High-Ductility Mg-Zn-Ca Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(1): 23-30.

Figures/Tables 10

Fig. 1 X-ray diffraction pattern of the as-cast Mg-2Zn-0.6Ca alloy

Fig. 2 a Optical micrograph, b SEM image of the as-cast Mg-2Zn-0.6Ca alloy

Fig. 3 a Optical micrograph, b SEM image of the as-extruded Mg-2Zn-0.6Ca alloy

Fig. 4 a IPF map, b Schmid actor distribution based on EBSD analysis, c (0001), (101ˉ1ˉ0) and (112ˉ2ˉ0) pole figures of the as-extruded Mg-2Zn-0.6Ca alloy

Fig. 5 Macro-textures of the as-extruded a Mg-2Zn, b Mg-2Zn-0.6Ca alloy

Fig. 6 Tensile stress-strain curves of the as-cast and as-extruded Mg-2Zn-0.6Ca alloys

Table 1 Tensile properties of the Mg-2Zn-0.6Ca alloy at room temperature

Mg-2Zn-0.6Ca	YS (MPa)	UTS (MPa)	Elongation, δ (%)
0°	130	280	29.6
45°	159	285	23.1
90°	190	282	16.2
As-cast	55	148	5.7

Table 2 Reported tensile properties of Mg alloys with RE and other Mg-Zn-Ca alloys in comparison with the alloy in this work

Alloys (wt%)	Process	YS (MPa)	UTS (MPa)	δ (%)	Refs.
Mg-2Zn-0.6Ca	Extruded	130	289	29.6	This work
Mg-2Zn-1Zr	Rolled	185	258	26.9	[44]
Mg-1.5Zn-0.2Ca-0.2Ce	Extruded	131	336.4	42.4	[34]
Mg-2.26Zn-0.38Mn-0.23Ce	Rolled?+?annealed	101	223	38.3	[35]
Mg-2.74Gd-1.06Zn	Rolled?+?annealed	130.6	220	40	[12]
Mg-9Gd-4Y-0.6Zr	Extruded?+?T5	150	128	54	[36]
Mg-5.25Zn-0.6Ca	Extruded	220	-	21.4	[37]
Mg-5.25Zn-0.6Ca-0.3Mn	Extruded	272	-	18.9	[37]
Mg-2.5Zn-0.3Ca-0.4La	Extruded	325	341	15	[38]
AZ31	Rolled	130.5	279.6	13	[39]

Fig. 7 SEM image of the fracture surface of as-extruded Mg-2Zn-0.6Ca alloy

Fig. 8 Optical microstructures of a the fracture surface, b position far away from the fracture surface for as-extruded Mg-2Zn-0.6Ca alloy

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A High-Ductility Mg-Zn-Ca Magnesium Alloy

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