Effect of Extrusion Temperature on the Mechanical Properties and Corrosion Behavior of LZ91 Alloys

doi:10.1007/s40195-023-01590-z

Abstract

Abstract:

Microstructural observations, tensile tests, potentiodynamic polarization measurements, and corrosion morphology examinations are conducted to investigate the effect of extrusion temperature on the mechanical properties and corrosion behavior of LZ91 alloys. The results show that the tensile strength of the LZ91 alloy is increased by 86 MPa after extrusion at 25 °C. Meanwhile, the corrosion resistance is improved by about 2.7 times, and the maximum corrosion depth is decreased by 60 μm. The increase in the tensile strength can be mainly attributed to the α-Mg precipitate strengthening in β-Li. The improvement of the corrosion resistance is due to the fact that the nano-sized MgLiZn and refined α-Mg precipitates in β-Li weaken the effect of the cathodic phase on micro-galvanic corrosion, thereby decreasing the cathodic current density and local corrosion susceptibility. However, when the extrusion temperature is increased to 300 °C, the corrosion rate is significantly accelerated due to the increase of the micro-galvanic corrosion caused by α-Mg precipitate coarsening at high temperatures.

Key words: Mg-Li alloy, Extrusion temperature, Mechanical properties, Corrosion behavior

Xuejian Wang, Huaqiang Xiao, Keqiang Su, Bo Lin, Tongmin Wang, Enyu Guo. Effect of Extrusion Temperature on the Mechanical Properties and Corrosion Behavior of LZ91 Alloys[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(11): 1822-1832.

Figures/Tables 12

Table 1 The composition of LZ91 alloy used in this study (in wt%)

Li	Zn	Al	Si	Fe	Mg
8.67	1.05	0.41	0.06	0.02	Balance

Fig. 1 XRD patterns of LZ91 alloys

Fig. 2 Optical microstructure of the LZ91 alloys: a F-LZ91 alloy; b 25 °C-LZ91 alloy; c 150 °C-LZ91 alloy; d 300 °C-LZ91 alloy

Fig. 3 a BSE micrograph of the F-LZ91 alloy; b magnified image of the β-Li phase in the F-LZ91 alloy; c Zn element mapping of b image; d-f BSE micrographs of the 25 °C-LZ91, 150 °C-LZ91, and 300 °C-LZ91 alloys, respectively

Fig. 4 a Scanning transmission electron microscopic image of the MgLiZn phase; b high resolution transmission electron microscopic image of the MgLiZn phase; c FFT image of the MgLiZn phase

Fig. 5 Pole figures of α-Mg phases: a 25 °C-LZ91 alloy; b 150 °C-LZ91 alloy; c 300 °C-LZ91 alloy

Fig. 6 ODF of β-Li phase in LZ91 alloys measured by XRD: a 25 °C-LZ91 alloy; b 150 °C-LZ91 alloy; c 300 °C-LZ91 alloy

Fig. 7 a Microhardness of the α-Mg and β-Li phases; b stress-strain curves of LZ91 alloys obtained under different extrusion temperatures

Fig. 8 Average corrosion rates of different LZ91 alloys after immersion in 3.5 wt% NaCl solution for 72 h

Fig. 9 Surface morphologies with corrosion products of the LZ91 alloys after immersion in 3.5 wt% NaCl solution for 4 h and 72 h: a, e F-LZ91 alloy; b, f 25 °C-LZ91 alloy; c, g 150 °C-LZ91 alloy; d, h 300 °C-LZ91 alloy

Fig. 10. 3D morphologies without corrosion products of LZ91 alloys after immersion in 3.5 wt% NaCl solution for 72 h: a F-LZ91 alloy; b 25 °C-LZ91 alloy; c 150 °C-LZ91 alloy; d 300 °C-LZ91 alloy

Fig. 11 Potentiodynamic polarization curves of the LZ91 alloys

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