Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy

Table 1

EDS result of the as-cast alloys.

Alloys	Point	Mg	Zn	Gd	Ca	Possible phase
Mg-7.2Zn-2.4Gd	1	43.06	47.74	9.2	—	I-phase
	2	78.79	17.95	3.26	—	I-phase
	3	76.23	21.01	2.76	—	I-phase + Mg4Zn7
Mg-7.2Zn-2.4Gd-0.16Ca	1	68.5	27.38	3.85	0.27	I-phase + Mg4Zn7
	2	77.56	19.84	0.14	2.46	Mg6Zn3Ca2 + Mg4Zn7
	3	60.18	33.38	6.43	0.01	I-phase
Mg-7.2Zn-2.4Gd-0.32Ca	1	94.28	4.50	0.84	0.38	I-phase
	2	92.31	5.56	2.12	0.01	W-phase
	3	98.89	0.92	0.07	0.12	Mg6Zn3Ca2 + Mg4Zn7
Mg-7.2Zn-2.4Gd-0.64Ca	1	88.45	9.08	2.03	0.44	W-phase + Mg6Zn3Ca2
	2	82.85	11.58	5.44	0.12	W-phase + Ca-containing phase
	3	87.51	8.56	3.81	0.12	W-phase + Ca-containing phase
	4	77.69	15.20	6.95	0.16	W-phase + Ca-containing phase