Effect of nanodiamond particle sizes on damping properties of ZK60 magnesium matrix composites

Abstract The aim of the research is to ensure that the material has functional mechanical properties as well as high-damping value. The microstructure, elemental composition, second phase distribution and interface structure of the Mg-based composite with different particle sizes were characterized by Optical Microscope(OM), X-Ray Diffractometer(XRD), Scanning Electron Microscope(SEM), Transmission Electron Microscope(TEM) and Energy Dispersive Spectrometer (EDS). The mechanical and damping properties of the ZK60 magnesium matrix composites were investigated an Instron5982 universal tester and Dynamic Mechanical Analysis (DMA). The results indicate that nanodiamond(ND) can disperse well in the composites. The elastic modulus of composite can reach 9.9GPa after reinforcement phase being added. Under certain conditions,the damping value can reach beyond 2.5×10-1, which is 117% of other composite. High-temperature damping depends on grain boundary slip and interface slip. The interfacial damping depends on the difference in the incoherent interface and thermal expansion coefficient between the nanodiamond and ZK60 matrix to slip and improve the damping value.

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Damping Capacity of SiCp/AZ61 Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.123-125.35 ◽

2010 ◽

Vol 123-125 ◽

pp. 35-38

Author(s):

Hong Yan ◽

Huang Xin ◽

Qang Hu

Keyword(s):

Thermal Analysis ◽

Room Temperature ◽

Damping Capacity ◽

Matrix Composites ◽

Damping Properties ◽

Magnesium Matrix ◽

Casting Technique ◽

Magnesium Matrix Composites ◽

Dislocation Pinning ◽

Sic Particulates

Magnesium matrix composites SiCp/ AZ61 reinforced with SiC particulates was fabricated by stirring-melt casting technique. The damping properties of the composites have been studied with dynamic mechanical thermal analysis and micro-structural observation. The results show that matrix grains introduced SiC particulates were refined obviously at room temperature and the properties of SiCp/ AZ61 composites were improved comparison to AZ61 alloy. Meanwhile, the improvement of damping properties can be explained by G-L dislocation pinning theory. The damping characterization is explained with the increasing of quantities of the grain-boundaries for the introducing of SiC particles and the ease of interface slipping in temperature.

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Crystallography of the second phase/SiC particles interface, nucleation of the second phase at β-SiC and its effect on interfacial bonding, elastic properties and ductility of magnesium matrix composites

Journal of Materials Science ◽

10.1007/bf00356718 ◽

1995 ◽

Vol 30 (22) ◽

pp. 5763-5769 ◽

Cited By ~ 14

Author(s):

B. Inem

Keyword(s):

Elastic Properties ◽

Interfacial Bonding ◽

Second Phase ◽

Matrix Composites ◽

Magnesium Matrix ◽

Magnesium Matrix Composites ◽

Sic Particles

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Investigation on Damping Capacities of Spherical Mg2Si Magnesium Matrix Composites Prepared by Super-Gravity Method

MATEC Web of Conferences ◽

10.1051/matecconf/201820703019 ◽

2018 ◽

Vol 207 ◽

pp. 03019

Author(s):

Yun-si Wang ◽

Rui-long Niu ◽

Fang-jia Yan ◽

Dong-ping Duan ◽

Xue-min Yang

Keyword(s):

Fly Ash ◽

Critical Strain ◽

Particle Sizes ◽

Matrix Composites ◽

Magnesium Matrix ◽

Gravity Method ◽

Magnesium Matrix Composites ◽

The Matrix ◽

Sem Micrograph ◽

Damping Materials

Due to inherent high damping capacities of Mg, Mg-based alloys or composites can absorb enormous elastic energy, thus, can be used as damping materials playing important role in reducing vibration and noise. Spherical Mg2Si magnesium matrix composites were prepared by super-gravity method with fly ash floating beads with particle sizes of 80, 125 and 500 μm. The microstructures and damping capacities of prepared samples were discussed. Spherical and fragment-shaped Mg2Si phases were observed in the matrix by SEM micrograph. Increasing particle size of fly ash floating beads can lead to an obviously decreasing tendency of internal friction tan φ. The critical strain εcr=1.9×10−2 of ε – tan φ curve and critical temperature Tcr=150 °C of T – tan φ curve for tan φ changing from slowly to greatly increasing. Damping peaks occur in the vicinity of strain ε=5.2×10−2 in ε –tan φ curve whereas no damping peaks occur in T –tan φ curve.

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Microstructure and microanalysis of sintered Fe-Nd-B permanent magnets

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178082 ◽

1990 ◽

Vol 48 (4) ◽

pp. 990-991

Author(s):

Mahesh Chandramouli

Keyword(s):

Electron Microscope ◽

Liquid Phase ◽

Permanent Magnets ◽

Phase Distribution ◽

Energy Dispersive Spectrometer ◽

Nucleation And Growth ◽

Liquid Phase Sintering ◽

Domain Wall Energy ◽

Oxide Phases ◽

Scanning Electron

Magnetization reversal in sintered Fe-Nd-B, a complex, multiphase material, occurs by nucleation and growth of reverse domains making the isolation of the ferromagnetic Fe14Nd2B grains by other nonmagnetic phases crucial. The magnets used in this study were slightly rich in Nd (in comparison to Fe14Nd2B) to promote the formation of Nd-oxides at multigrain junctions and incorporated Dy80Al20 as a liquid phase sintering addition. Dy has been shown to increase the domain wall energy thus making nucleation more difficult while Al is thought to improve the wettability of the Nd-oxide phases.Bulk polished samples were examined in a JEOL 35CF scanning electron microscope (SEM) operated at 30keV equipped with a Be window energy dispersive spectrometer (EDS) detector in order to determine the phase distribution.

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