Experimental Investigation of the Mg-Zn-Zr Isothermal Section at 400 °C

doi:10.1007/s40195-018-0778-5

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (4): 426-432.DOI: 10.1007/s40195-018-0778-5

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Experimental Investigation of the Mg-Zn-Zr Isothermal Section at 400 °C

Yong-Peng Liang, Shu-Hong Liu(), Kai Xu, Yong Du

1 State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China
2 School of Materials Science and Engineering, Central South University, Changsha 410083, China

Received:2018-03-07 Revised:2018-05-04 Online:2019-04-10 Published:2019-04-19
Contact: Liu Shu-Hong
About author:
Dr. Kun-Kun Deng was born in 1983 and was awarded Ph. D in Harbin University of Technology in 2011. After graduation, he worked in the College of Materials Science and Engineering, Taiyuan University of Technology. At the same time, he continued his research work on the design, fabrication and processing of advanced Mg-based material in. Now, he is the vice chairman of Youth Committee in Magnesium Alloy Branch of Chinese Materials Research Society. He was denoted as young academic pacemaker of Shanxi Province in 2018. He has held two projects of National Nature Science Foundation of China, one project of Specialized Research Fund for the Doctoral Program of Higher Education, one Project of International Cooperation in Shanxi and two projects of Natural Science Foundation of Shanxi. He has published more than 60 articles. The time cited is more than 840 (without selfcitations), and the H-index is 22. In addition, he has published one academic monograph and acquired eight Chinese patents.

Abstract

Abstract:

Mg-Zn-Zr series Mg alloys (ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties. The phase equilibria of the Mg-Zn-Zr system at 400 °C covering the overall composition range were investigated by X-ray diffraction and electron probe microanalyses on thirteen ternary alloys. Three ternary compounds, τ₁, τ₂ and τ₃, were detected to be thermodynamically stable at 400 °C, and their homogeneity range was determined to be Mg_(7-17)Zn_(80-88)Zr_(4-6), Mg_(15-22)Zn_(66-68)Zr_(9-16) and Mg₉Zn₆₈Zr₂₃ (in at.%), respectively. Eight three-phase regions and four two-phase regions were observed. The maximum solubility of Mg in Zn₂₂Zr, Zn₃₉Zr₅ and Zn₃Zr phases was measured to be 0.52, 0.37 and 0.99 at.%, respectively, while the solubility of Zr in MgZn₂ and Mg₂Zn₃ phases is negligible. The isothermal section of the Mg-Zn-Zr system at 400 °C was then constructed based on the present experimental data.

Key words: Mg-Zn-Zr, Isothermal section, Phase equilibria, Ternary compounds

Yong-Peng Liang, Shu-Hong Liu, Kai Xu, Yong Du. Experimental Investigation of the Mg-Zn-Zr Isothermal Section at 400 °C[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(4): 426-432.

Figures/Tables 6

References

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No.	Nominal composition (at.%)			Phase	Phase composition (at.%)
No.	Mg	Zn	Zr	Phase	Mg	Zn	Zr
1#	1.0	97.0	2.0	(Zn)	0.23	99.71	0.06
				Zn₂₂Zr	0.52	95.08	4.40
				Liquid^a	-	-	-
2#	6.0	90.0	4.0	τ ₁	7.55	85.87	6.58
2#	6.0	90.0	4.0	Liquid	8.27	91.72	0.01
3#	16.0	82.0	2.0	MgZn₂	31.01	68.96	0.03
				τ ₁	7.95	87.84	4.21
				Liquid^a	-	-	-
4#	17.0	80.0	3.0	MgZn₂	30.30	69.61	0.09
4#	17.0	80.0	3.0	τ ₁	8.88	87.16	3.96
5#	15.0	75.0	10.0	MgZn₂	31.35	68.29	0.36
				τ ₁	16.74	78.34	4.92
				Zn₃Zr	0.22	76.64	23.14
6#	5.0	80.0	15.0	Zn₃Zr	0.18	77.26	22.56
				Zn₃₉Zr₅	0.28	89.10	10.62
				τ ₁	15.14	80.27	4.59
7#	11.0	83.0	6.0	τ ₁	8.97	85.91	5.12
7#	11.0	83.0	6.0	Zn₃₉Zr₅	0.37	89.10	10.52
8#	35.0	63.0	2.0	MgZn₂	35.04	64.93	0.03
				Mg₂Zn₃	38.12	61.87	0.01
				τ ₂	15.60	68.21	16.19
9#	42.0	55.0	3.0	Liquid	67.1	32.8	0.01
				Mg₂Zn₃	39.10	60.90	0
				τ ₂	19.30	67.45	13.15
10#	15.0	68.0	17.0	τ ₂	22.58	67.99	9.43
10#	15.0	68.0	17.0	Zn₃Zr	0.70	75.92	23.38
11#	10.0	70.0	20.0	τ ₂	16.39	68.25	15.36
				Zn₃Zr	0.78	75.91	23.31
12#	80.0	8.0	2.0	(Mg)	96.41	3.59	0
				τ ₂	22.20	65.03	12.77
				Liquid^a	-	-	-
13#	12.0	68.0	20.0	Zn₃Zr	0.99	74.96	4.05
				τ ₂	17.52	67.06	15.42
				τ ₃	9.14	68.05	22.81

No.	Nominal composition (at.%)			Phase	Phase composition (at.%)
No.	Mg	Zn	Zr	Phase	Mg	Zn	Zr
1#	1.0	97.0	2.0	(Zn)	0.23	99.71	0.06
				Zn₂₂Zr	0.52	95.08	4.40
				Liquid^a	-	-	-
2#	6.0	90.0	4.0	τ ₁	7.55	85.87	6.58
2#	6.0	90.0	4.0	Liquid	8.27	91.72	0.01
3#	16.0	82.0	2.0	MgZn₂	31.01	68.96	0.03
				τ ₁	7.95	87.84	4.21
				Liquid^a	-	-	-
4#	17.0	80.0	3.0	MgZn₂	30.30	69.61	0.09
4#	17.0	80.0	3.0	τ ₁	8.88	87.16	3.96
5#	15.0	75.0	10.0	MgZn₂	31.35	68.29	0.36
				τ ₁	16.74	78.34	4.92
				Zn₃Zr	0.22	76.64	23.14
6#	5.0	80.0	15.0	Zn₃Zr	0.18	77.26	22.56
				Zn₃₉Zr₅	0.28	89.10	10.62
				τ ₁	15.14	80.27	4.59
7#	11.0	83.0	6.0	τ ₁	8.97	85.91	5.12
7#	11.0	83.0	6.0	Zn₃₉Zr₅	0.37	89.10	10.52
8#	35.0	63.0	2.0	MgZn₂	35.04	64.93	0.03
				Mg₂Zn₃	38.12	61.87	0.01
				τ ₂	15.60	68.21	16.19
9#	42.0	55.0	3.0	Liquid	67.1	32.8	0.01
				Mg₂Zn₃	39.10	60.90	0
				τ ₂	19.30	67.45	13.15
10#	15.0	68.0	17.0	τ ₂	22.58	67.99	9.43
10#	15.0	68.0	17.0	Zn₃Zr	0.70	75.92	23.38
11#	10.0	70.0	20.0	τ ₂	16.39	68.25	15.36
				Zn₃Zr	0.78	75.91	23.31
12#	80.0	8.0	2.0	(Mg)	96.41	3.59	0
				τ ₂	22.20	65.03	12.77
				Liquid^a	-	-	-
13#	12.0	68.0	20.0	Zn₃Zr	0.99	74.96	4.05
				τ ₂	17.52	67.06	15.42
				τ ₃	9.14	68.05	22.81

Experimental Investigation of the Mg-Zn-Zr Isothermal Section at 400 °C

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