Enhanced Strength and Corrosion Resistance of Mg-2Zn-0.6Zr Alloy with Extrusion

doi:10.1007/s40195-018-0793-6

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (1): 10-22.DOI: 10.1007/s40195-018-0793-6

所属专题： 2019年镁合金专辑； 2019年腐蚀专辑-2

收稿日期:2018-05-08 修回日期:2018-06-05 出版日期:2019-01-10 发布日期:2019-01-18
作者简介:
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.

Enhanced Strength and Corrosion Resistance of Mg-2Zn-0.6Zr Alloy with Extrusion

Luan-Xiang Wang¹, Ren-Bo Song¹(), Chang-Hong Cai¹, Jing-Yuan Li¹

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2018-05-08 Revised:2018-06-05 Online:2019-01-10 Published:2019-01-18
Contact: Song Ren-Bo
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.

摘要/Abstract

Abstract:

The microstructure, mechanical properties and corrosion behavior of Mg-2Zn-0.6Zr alloy under the as-cast and as-extruded conditions were investigated. Microstructure analysis indicated the remarkable grain refinement by extrusion, as well as notable reductions in volume fraction and size of precipitate phases. As compared with the as-cast alloy, the as-extruded alloy exhibited better mechanical performance, especially in yield strength which was promoted from 51 to 194 MPa. Refined grains, dispersive precipitate phases and texture were thought to be the main factors affecting the improved performance in strength. The electrochemical measurement and immersion test revealed the corrosion rate of Mg-2Zn-0.6Zr alloy by extrusion decreased from 1.68 to 0.32 mm/year. The reasons for the enhanced corrosion resistance were mainly attributed to the decreased volume fraction and Volta potential of the precipitate phases, the refinement of the grain size, as well as the formation of more protective corrosion film.

Key words: Mg-2Zn-0.6Zr, Extrusion, Strength, Corrosion behavior

. [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(1): 10-22.

Luan-Xiang Wang, Ren-Bo Song, Chang-Hong Cai, Jing-Yuan Li. Enhanced Strength and Corrosion Resistance of Mg-2Zn-0.6Zr Alloy with Extrusion[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(1): 10-22.

图/表 18

Table 1 Nominal and analyzed compositions of Mg-Zn-Zr alloys (wt%)

Alloy	Zn	Zr	Fe	Ni	Cu	Al	Mg
Nominal composition	2	0.6	-	-	-	-	Bal.
Analyzed composition	1.87	0.54	< 0.01	< 0.01	< 0.01	0.06	Bal.

Fig. 1 Optical micrographs a, b and SEM images c, d of Mg-2Zn-0.6Zr alloy: a, c as-cast, b, d as-extruded

Fig. 2 XRD patterns of Mg-2Zn-0.6Zr alloy under different conditions

Table 2 EDS analysis of tested alloys

Element (at.%)	Mg	Zn	Zr
Area A	65.87	34.07	0.06
Area B	58.46	18.16	23.38
Area C	99.36	0.53	0.11
Area D	56.94	12.4	30.66
Area E	99.23	0.68	0.09

Fig. 3 Inverse pole figure of as-extruded Mg-2Zn-0.6Zr alloy

Fig. 4 SKPFM images of a as-cast alloy, b as-extruded alloy and corresponding Volta potential profiles along lines (A, B) in the SKPFM images

Fig. 5 Typical tensile stress-strain curves of Mg-2Zn-0.6Zr alloys at room temperature

Fig. 6 Mechanical properties of pure Mg and Mg-2Zn-0.6Zr alloys

Fig. 7 Potentiodynamic polarization curves of Mg-2Zn-0.6Zr alloys immersed in Hank’s solution

Table 3 Electrochemical parameters of Mg-2Zn-0.6Zr alloys in Hank’s solution attained from the polarization test

Alloy	E_corr (V_SCE)	I_corr (μA/cm²)	E_b (V_SCE)	β_c (mV/decade)	β_a (mV/decade)	R_p (kΩ cm²)
As-cast	-?1.550	12.2	-?1.501	178.1	142.2	2.82
As-extruded	-?1.498	5.3	-?1.399	146.8	161.2	6.3

Fig. 8 EIS plots of Mg-2Zn-0.6Zr alloys in Hank’s solution: a Nyquist plot, b Bode plot of |Z| versus frequency, c Bode plot of degree versus frequency, d equivalent circuit

Table 4 Fitting results of the EIS spectra

Alloy	R_s (Ω cm²)	Y_o (μΩ^-1 cm^-2 s^-1)	n	R_ct (Ω cm²)	C_f (μF cm^-2)	R_f (Ω cm²)
As-cast	27.8	23.3	0.678	5139.2	4.6	144.2
As-extruded	17.6	18.0	0.724	6904.7	1.9	164.4

Fig. 9 pH variation of Hank’s solution for Mg-2Zn-0.6Zr alloys

Fig. 10 Three-dimensional morphologies of tested alloys after removal of corrosion products: a, c as-cast alloy, b, d as-extruded alloy

Fig. 11 SEM images of the cross-sectional morphologies after immersion in Hank’s solution for 10 days: a as-cast alloy, b as-extruded alloy

Fig. 12 Corrosion morphologies of as-cast a, c, e and as-extruded b, d, f Mg-2Zn-0.6Zr alloys after immersion in Hank’s solution for a, b 0.5 h, c, d 12 h, e, f 5d

Fig. 13 XRD analysis of the corrosion products formed on the surface of Mg-2Zn-0.6Zr alloys

Fig. 14 Statistics of material properties of biodegradable magnesium alloys

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Enhanced Strength and Corrosion Resistance of Mg-2Zn-0.6Zr Alloy with Extrusion

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