Enhanced Damping Capacities of Mg-Ce Alloy by the Special Microstructure with Parallel Second Phase

doi:10.1016/j.jmst.2016.06.027

J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (9): 941-946.DOI: 10.1016/j.jmst.2016.06.027

Special Issue: 2017-2018年Mg合金专题

• Orginal Article • Previous Articles Next Articles

Enhanced Damping Capacities of Mg-Ce Alloy by the Special Microstructure with Parallel Second Phase

Wu Zhongshan¹, Wang Jingfeng^1,^2,^*(), Wang Haibo¹, Ma She³, Huang Song¹, Li Shun¹, Pan Fusheng^1,²

¹National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
²The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
³Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China

Received:2016-03-01 Revised:2016-06-01 Accepted:2016-06-02 Online:2017-09-20 Published:2017-10-16
Contact: Wang Jingfeng
About author:
1 The authors contributed equally to this work.

Abstract

Abstract:

Microstructure evolution and damping capacities of Mg-Ce binary alloys with three different Ce contents (0.5, 1, or 2 wt%) have been systematically investigated in this work. Numerous fine parallel second phases in Mg-2Ce alloy are obtained, as well as a large number of dislocations around them, but few dislocations appear around the reticular second phase in the Mg-1Ce alloy. Among the three alloys, two internal friction peaks (P₁ and P₂) are detected at about 78 and 167°C in both the Mg-0.5Ce and Mg-1Ce alloys. In addition, the alloy with special parallel second phase structure exhibits excellent damping capacity in both strain amplitude and temperature-dependent regions. These results may be ascribed to the stress concentration and the formation of abundant parallel and uniform dislocation configurations in the α-Mg matrix without the influence of crystal orientation. The obtained results may provide a novel idea to prepare high-damping magnesium alloys by tailoring their microstructure.

Key words: Mg-Ce alloy, Parallel second phase, Dislocation configuration, Damping capacity

Wu Zhongshan, Wang Jingfeng, Wang Haibo, Ma She, Huang Song, Li Shun, Pan Fusheng. Enhanced Damping Capacities of Mg-Ce Alloy by the Special Microstructure with Parallel Second Phase[J]. J. Mater. Sci. Technol., 2017, 33(9): 941-946.

Figures/Tables 9

Table 1 Chemical composition of the investigated Mg-Ce alloys (wt%)

Alloy	Ce	Fe	Si	Mg
Mg-0.5Ce	0.46	0.01	0.01	Bal.
Mg-1Ce	1.09	0.02	0.02	Bal.
Mg-2Ce	2.11	0.01	0.02	Bal.

Fig. 1. Microstructures of the as-cast (a) Mg-0.5Ce, (b) Mg-1Ce and (c) Mg-2Ce alloys, and (d) corresponding higher magnification micrograph of Mg-2Ce alloy.

Fig. 2. Schematic illustrations of the growth morphology of second phase: (a) dispersed reticular distribution; (b) dendritic distribution; (c) parallel and long straight distribution.

Table 2 EDS results of the compositions (at.%) of the corresponding positions in Fig. 1

Alloy	Position	Mg	Ce
Mg-0.5Ce	A1	93.78	6.22
Mg-0.5Ce	A2	94.76	5.84
Mg-1Ce	B1	93.50	6.50
Mg-1Ce	B2	100.00	—
Mg-2Ce	C1	93.57	6.43
Mg-2Ce	C2	92.99	7.01

Fig. 3. XRD patterns of the as-cast Mg-Ce alloys.

Fig. 4. The damping capacities of Mg-Ce alloys: (a) strain amplitude dependence; (b) temperature dependence.

Fig. 5. Bright field TEM images of (a) Mg-1Ce; (b) Mg-2Ce alloys; the corresponding EDX spectra of (c) position A in (a) and (d) position B in (b).

Fig. 6. TEM micrographs showing the dislocation configurations in (a) Mg-1Ce alloy and (b) Mg-2Ce alloy; high resolution transmission electron microscope images of as-cast Mg-2Ce showing (c) dislocation distribution and (d) the interface between Mg12Ce parallel phase and matrix.

Fig. 7. Pole figures of as-cast Mg-2Ce alloy.

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Enhanced Damping Capacities of Mg-Ce Alloy by the Special Microstructure with Parallel Second Phase

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