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

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.

scholarly journals Rocess Design of Fiber Reinforced Magnesium Matrix Composites

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Ding Hualun
Keyword(s):  
Composite Materials ◽  
Matrix Composites ◽  
Deposition Method ◽  
Fiber Reinforced ◽  
Casting Method ◽  
Magnesium Matrix ◽  
Preparation Methods ◽  
Magnesium Matrix Composites ◽  
The Matrix ◽  
And Performance

This paper chooses magnesium as the matrix of composite materials, selects carbon fi ber as reinforcement, anddesigns the composite scheme according to the structure and performance of Mg-based composites. The performancecharacteristics and application prospect of fiber-reinforced magnesium matrix composites are introduced. Wait. Inthis paper, the process of preparing carbon fi ber magnesium matrix composites by compression casting method andspray deposition method is designed. The process fl ow chart of these two design schemes is determined by analyzingthe principle of these two kinds of preparation methods, and the specifi c problems of the process are analyzed andsummarized.

scholarly journals Types of Component Interfaces in Metal Matrix Composites on the Example of Magnesium Matrix Composites

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5182
Author(s):  
Katarzyna N. Braszczyńska-Malik
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Rare Earth Elements ◽  
Matrix Composites ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Transmission Electron ◽  
The Matrix ◽  
Ti Particles ◽  
Cast Magnesium

In this paper, a summary of investigations of the microstructure of cast magnesium matrix composites is presented. Analyses of the interfaces between the reinforcing particles and the magnesium alloy matrices were performed. Technically pure magnesium and four various alloys with aluminum and rare earth elements (RE) were chosen as the matrix. The composites were reinforced with SiC and Ti particles, as well as hollow aluminosilicate cenospheres. Microstructure analyses were carried out by light, scanning, and transmission electron microscopy. The composites with the matrix of magnesium and magnesium–aluminum alloys with SiC and Ti particles exhibited coherent interfaces between the components. In the composites based on ternary magnesium alloy with Al and RE with Ti particles, a high-melting Al2RE phase nucleated on the titanium. Different types of interfaces between the components were observed in the composites based on the magnesium–rare earth elements alloy with SiC particles, in which a chemical reaction between the components caused formation of the Re3Si2 phase. Intensive chemical reactions between the components were also observed in the composites with aluminosilicate cenospheres. Additionally, the influence of coatings created on the aluminosilicate cenospheres on the bond with the magnesium matrix was presented. A scheme of the types of interfaces between the components is proposed.

Microstructural Aspects of Some Magnesium Matrix Composites Reinforced with Amorphous/Nanocrystalline Ni-Ti Particulates

2019 ◽  
Vol 70 (8) ◽  
pp. 2903-2907
Author(s):  
Ruxandra Elena Dumitrescu ◽  
Ioana Arina Gherghescu ◽  
Sorin Ciuca ◽  
Mariana Ciurdas ◽  
Daniela Alina Necsulescu ◽  
...  
Keyword(s):  
Nanocrystalline Structure ◽  
High Energy ◽  
Chemical Compositions ◽  
Matrix Composites ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Plasma Sintering ◽  
Polyphase Structure ◽  
Reinforcement Material ◽  
The Matrix

Two magnesium matrix composites reinforced with 3 and 10% Ni-Ti particulates, respectively, were obtained by plasma sintering. The reinforcement material was obtained by grinding a mixture of powders of 68% Ni and 32% Ti atomic percent in a high energy mill for 40 hours. Particulates resulting from mechanical alloying have a partially amorphous and partially nanocrystalline structure, consisting of the following phases: Ni solid solution, Ti2Ni and NiTi (B2) phase. After sintering, both the matrix and the reinforcement material are nanocrystalline and the particulates have a polyphase structure, consisting of Ni(Ti), NiTi (R phase) and Ni4Ti3. The hardness of these composites is superior to the hardness of magnesium matrix composites reinforced with Ni-Ti particulates having 50% Ni / 50% Ti and 32% Ni / 68% Ti chemical compositions obtained under the same conditions and corresponding proportions of reinforcement material.

Research on Properties of SiCp/AZ61 Magnesium Matrix Composites in Fabrication Processes

2007 ◽  
Vol 561-565 ◽  
pp. 945-948 ◽  
Author(s):  
Hong Yan ◽  
Ming Fu Fu ◽  
Fa Yun Zhang ◽  
Guo Xiang Chen
Keyword(s):  
Vickers Hardness ◽  
Volume Fraction ◽  
Casting Process ◽  
Matrix Composites ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Az61 Magnesium Alloy ◽  
The Matrix ◽  
Sic Particulates ◽  
Semi Solid

The microstructural structures of SiCp/AZ61magnesium matrix composite were studied in three different casting processes, and their hardness was measured. The results indicated that SiCp/AZ61 composites fabricated in stirring melt casting process, compared to those in fully liquid stirring casting process and in semi-solid stirring casting process, possessed fairly uniform distribution of SiC particulates and few porosity rate. It was an ideal metal matrix composites fabricated process. The Vickers hardness of non-reinforcement AZ61 magnesium alloy is higher than that of semi-solid billet, and the Vickers hardness of SiCp/AZ61 composite is obviously higher than that of the matrix. In the meantime, the Vickers hardness of SiCp/AZ61 composite can be continuously enhanced with an increasing of volume fraction of SiC particles.

scholarly journals Reactivity and Microstructure of Al2O3-Reinforced Magnesium-Matrix Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Maher Mounib ◽  
Matteo Pavese ◽  
Claudio Badini ◽  
Williams Lefebvre ◽  
Hajo Dieringa
Keyword(s):  
Chemical Reaction ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Magnesium Matrix ◽  
Eutectic Region ◽  
Magnesium Matrix Composites ◽  
Transmission Electron ◽  
The Matrix

Performances of metal matrix composites (MMCs) rely strongly on the distribution of particles within the metal matrix but also on the chemical reaction which may occur at the liquid-solid interfaces. This paper presents the chemical reaction between aluminum based particles Al2O3and Al2O3-AlOOH with magnesium alloys matrixes AZ91 and EL21, respectively, and studies the microstructure of these reinforced composites. Different methods such as transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and XRD were used to highlight these chemical reactions and to identify products. Results demonstrate the formation of MgO particles within the matrix for both composites and also the dissolution of aluminum in the eutectic region in the case of EL21.

Production and Structural Characterization of Some Magnesium Matrix Composites Reinforced with Amorphous/Nanocrystalline NiTi Particulates

2019 ◽  
Vol 69 (12) ◽  
pp. 3503-3507
Author(s):  
Mariana Ciurdas ◽  
Daniela Alina Necsulescu ◽  
Cristian Mircea Pantilimon ◽  
Vasile Ion ◽  
Magdalena Galatanu ◽  
...  
Keyword(s):  
High Energy ◽  
Amorphous Structure ◽  
Planetary Mill ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
The Matrix ◽  
Titanium Powders

Two mixtures of elemental nickel and titanium powders in atomic proportions of 50% Ni + 50% Ti and 32% Ni + 68% Ti, respectively, were ground for 40 hours in a high energy planetary mill. In the case of the first mixture, the mechanical alloying was totally produced, while for the second, the alloying was partial. In both mixtures, qualitative X-ray diffraction phase analysis revealed the presence of metastable phases, such as Ni HC and NiTi- R-phase. Also, the equiatomic mixture is characterized by a partially amorphous structure. 10% of each type of mixture submitted to milling was used as reinforcing element in the form of particulates for two magnesium matrix composites. They were obtained by sintering in the plasma at 590�C. In the case of the reinforced with the second mixture composite, the production of new phases other than the matrix and those present in the mixture of nickel and titanium powders after milling were recorded. The electron microscopy images of the two composites have resistant, free of micropores or microcracks matrix / particulates interfaces. The Mg-10% (32 at% Ni + 68 at% Ti) composite is characterized by Vickers hardness higher than that of the composite reinforced with the equiatomic mixture.

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

2021 ◽  
Author(s):  
DeCheng Lu ◽  
Jian Li ◽  
Zhuohua Li
Keyword(s):  
Electron Microscope ◽  
Phase Distribution ◽  
Energy Dispersive Spectrometer ◽  
Second Phase ◽  
Particle Sizes ◽  
Matrix Composites ◽  
Damping Properties ◽  
Boundary Slip ◽  
Magnesium Matrix ◽  
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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