Influence of Ca Content on Microstructure and Mechanical Properties of Extruded Mg-Al-Ca-Mn Alloys

doi:10.1007/s40195-022-01478-4

Abstract

Abstract:

Herein, the effects of Ca content on microstructure, texture and mechanical properties of extruded Mg-3Al-0.4Mn-xCa (x = 0.4, 0.8 and 1.2 wt%) rods are systematically investigated. The results reveal that the alloy, with Ca content of 0.8 wt%, exhibits the highest strength and ductility, possessing an ultimate tensile strength of 267.57 MPa and elongation (EL) of 16%. This is mainly due to the gradual transformation of typical fiber texture into a texture with a [10-11] component parallel to the extrusion direction (ED), which increases the Schmid factor of pyramidal slip and enhances the activation rate of pyramidal ⟨c + a⟩ slip. Simultaneously, the as-formed spherical phases and segregation of Ca at grain boundaries render a significant influence on the strength and ductility of the alloy.

Key words: Mg-Al-Mn-Ca, Microstructure, Texture, Mechanical properties

Weiying Huang, Jianhua Chen, Zhen Jiang, Xi Xiong, Wei Qiu, Jian Chen, Xianwei Ren, Liwei Lu. Influence of Ca Content on Microstructure and Mechanical Properties of Extruded Mg-Al-Ca-Mn Alloys[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(3): 426-438.

Figures/Tables 14

Table 1 Chemical composition of Mg-Al-Ca-Mn alloys

Alloy specimens	Measured composition (wt%)
Alloy specimens	Al	Ca	Mn	Mg
CA0.4	3.0	0.41	0.4	Bal.
CA0.8	2.9	0.79	0.4	Bal.
CA1.2	3.2	1.22	0.4	Bal.

Fig. 1 Dimensions of the tensile specimen (mm)

Fig. 2 Mechanical properties of extruded alloys with different Ca contents

Fig. 3 SEM images of extruded alloy specimens: a, d CA0.4; b, e CA0.8; c, f CA1.2

Fig. 4 Dimensions of secondary phase particles in three different alloy specimens

Fig. 5 SEM images and corresponding EDS maps of the a CA0.4, b CA0.8 c CA1.2 specimens

Fig. 6 EDS analysis of the intermetallic phase: a correspondence point 1 and b correspondence point 2

Fig.7 EBSD maps of a CA0.4; b CA0.8; c CA1.2 specimens; d corresponding grain size distributions

Fig. 8 Bright-field TEM images of a, b, c CA0.4 and d, e, f CA0.8 alloy specimens under a two-beam mode

Fig. 9 a TEM image and b corresponding EDX results of extruded CA0.8 specimen

Fig. 10 Deviation angle of c-axis from ED

Fig. 11 Statistical analysis of SF values on basal ?a? slip, prismatic ?a? slip and pyramidal ?c + a? slip

Fig. 12 Distribution of misorientation angle (θs) of extruded alloy specimens: a CA0.4, b CA0.8, c CA1.2

Fig. 13 HAADF-STEM images and corresponding EDS maps, showing GB segregation of extruded a CA0.4, b CA0.8 specimens

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