Tailoring the Microstructure and Mechanical Property of Mg-Zn Matrix Composite via the Addition of Al Element

doi:10.1007/s40195-024-01669-1

Abstract

Abstract:

The semi-solid stir casting method is adopted to prepare 10 wt% SiC_p/Mg-6Zn-0.5Ca-xAl (x = 0, 1, 3 and 5 wt%) composites, and the microstructure evolution and mechanical property of composites with various Al content are investigated. The results show that the addition of 3 wt% Al improves the distribution of SiC_p, whereas the SiC_p cluster occurs again with Al content greater than 3%. An abnormal phenomenon of twinning is observed in the cast composites in this work. The SiC_p/Mg-6Zn-0.5Ca composite possesses the highest twin content of ~ 23%, for which tension twins (TTW) and compression twins (CTW) account for ~ 19% and ~ 3%, respectively. The CTW is only observed in ZXA600 composite. The addition of Al has an inhibiting effect for the generation and growth of twins. The content of twin decreases firstly and then increases with increase of Al content. The lowest twin content is obtained as Al increases to 3 wt%. It is found the existence of twin is detrimental to the mechanical property of composites. As-cast SiC_p/Mg-6Zn-0.5Ca-3Al composite with the lowest twin content exhibits the optimal mechanical property of yield strength, ultimate tensile strength and elongation for 100 MPa, 188 MPa and 4.4%, respectively. The outstanding mechanical property is attributed to the uniform distribution of SiC_p, the low twin content and the well-distributed fine second phases.

Key words: Mg matrix composite, Synchrotron tomography, Twinning, Liquid melt processing, Mechanical property

Chong Wang, Fuyuan Liu, Xuejian Wang, Enyu Guo, Zelong Du, Kunkun Deng, Zongning Chen, Huijun Kang, Guohao Du, Tongmin Wang. Tailoring the Microstructure and Mechanical Property of Mg-Zn Matrix Composite via the Addition of Al Element[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(3): 438-452.

Figures/Tables 13

Fig. 1 OM morphology of composites: a ZXA600, b ZXA601, c ZXA603, and d ZXA605

Fig. 2 IPF of four composites: a ZXA600, b ZXA601, c ZXA603, and d ZXA605

Fig. 3 Misorientation angle distributions of grains in four composites: a ZXA600, b ZXA601, c ZXA603, and d ZXA605 composite

Fig. 4 Enlarged images, orientation distribution mapping and corresponding Kernal average misorientation map of grain in A a-d and B e-h region of Fig. 2a in ZXA600 composite

Fig. 5 X-ray diffraction patterns of four composites: a ZXA600, b ZXA601, c ZXA603, and d ZXA605 composite

Fig. 6 SEM images of four composites: a ZXA600, b ZXA601, c ZXA603, and d ZXA605 composite

Table 1 EDS element analysis results in the different regions in Fig. 6a, c

	Area	Chemical composition (at.%)						Possible phase
	Area	Mg	Zn	Ca	Al	Si	C	Possible phase
ZXA600	1	50.48	47.38	2.14	-	-	-	Ca₂Mg₆Zn₃
	2	38.17	61.83	-	-	-	-	MgZn₂
	3	54.19	43.98	1.84	-	-	-	Ca₂Mg₆Zn₃
	4	0.47	-	-	-	44.67	54.86	SiC
ZXA603	5	64.63	30.69	0.66	4.02	-	-	Mg₂Zn₃
	6	35.52	28.70	4.59	31.19	-	-	Ca₂(Mg,Al)₆Zn₃
	7	67.51	26.37	0.96	4.16	-	-	Mg₂Zn₃
	8	37.39	29.47	1.08	33.77	-	-	Mg₃₂(Al,Zn)₄₉

Fig. 7 TEM images of ZXA600 a-d and ZXA603 e-h; b the enlarged image of white dotted frame in a; c the enlarged image of white dotted frame in b; d the SAED patterns of white dotted frame in c; e the bright filed image of ZXA603 and SAED patterns of black dotted frame, f the interface morphology of SiCp and matrix, g the local enlarged image of e; h is the local enlarged image of black dotted frame in f

Fig. 8 3D distribution of SiCp and micro-voids of composites as well as the statistical distribution map of micro-voids: a, e, i ZXA600, b, f, j ZXA601, e, g, k ZXA603, and d, h, l ZXA605

Fig. 9 Engineering stress-strain curves of composites a and summarized YS, UTS and EL for various composites b

Fig. 10 Curves of volume fraction of solid phase with temperature

Fig. 11 Kernal average misorientation (KAM) map of four composites: a ZXA600, b ZXA601, c ZXA603, and d ZXA605 composite, respectively

Fig. 12 Images of stacking fault in ZXA603 composite: a morphology of stacking fault, and b HRTEM morphology of stacking fault and its local enlarged image

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