scholarly journals Effect of Content and Size of Reinforcements on the Grain Evolution of Graphene-Reinforced Aluminum Matrix Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2550
Author(s):  
Qi Wu ◽  
Pengfei Cai ◽  
Lianchun Long
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
High Performance ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Pinning Effect ◽  
High Temperature Processes ◽  
Average Grain Size ◽  
Size And Morphology

Graphene-reinforced aluminum matrix composites (GRAMCs) attract great interest in industries due to their high performance potential. High-temperature processes such as sintering and aging are usually applied during the preparation of GRAMCs, leading to grain coarsening that significantly influences its properties. In this work, a modified 3D Monte Carlo Potts model was proposed to investigate the effect of content and size of graphene on the grain evolution during the heat treatment of GRAMCs. Grain growth with graphene contents from 0.5 wt.% to 4.5 wt.% and sizes from 5 μm to 15 μm were simulated. The grain growth process, final grain size and morphology of the microstructure were predicted. The results indicated that both the content and size of the reinforcements had an impact on the grain evolution. The pinning effect of grain size can be enhanced by increasing the content and decreasing the size of graphene. Agglomeration and self-contacting phenomena of the graphene arose obviously when the contents and sizes were relatively high. The average grain size decreased by 48.77% when the content increased from 0.5 wt.% to 4.5 wt.%. The proposed method and predicted regulations can provide a reference for the design and fabrication of GRAMCs.

scholarly journals Effect of Vanadium Reinforcement on the Microstructure and Mechanical Properties of Magnesium Matrix Composites

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 806
Author(s):  
Liqing Sun ◽  
Shuai Sun ◽  
Haiping Zhou ◽  
Hongbin Zhang ◽  
Gang Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Milling Process ◽  
Mg Alloy ◽  
Matrix Composites ◽  
Magnesium Matrix Composites ◽  
Pinning Effect ◽  
Average Grain Size ◽  
The Matrix ◽  
Hot Press Sintering

In this work, vanadium particles (VP) were utilized as a novel reinforcement of AZ31 magnesium (Mg) alloy. The nanocrystalline (NC) AZ31–VP composites were prepared via mechanical milling (MM) and vacuum hot-press sintering. During the milling process, the presence of VP contributed to the cold welding and fracture mechanism, resulting in the acceleration of the milling process. Additionally, increasing the VP content accelerated the grain refinement of the matrix during the milling process. After milling for 90 h, the average grain size of AZ31-X wt % Vp (X = 5, 7.5, 10) was refined to only about 23 nm, 19 nm and 16 nm, respectively. In the meantime, VP was refined to sub-micron scale and distributed uniformly in the matrix, exhibiting excellent interfacial bonding with the matrix. After the sintering process, the average grain size of AZ31-X wt % VP (X = 5, 7.5, 10) composites still remained at the NC scale, which was mainly caused by the pinning effect of VP. Besides that, the porosity of the sintered composites was no more than 7.8%, indicating a good densification effect. As a result, there was little difference between the theoretical and real density. Compared to as-cast AZ31 Mg alloy, the microhardness of sintered AZ31-X wt % VP (X = 5, 7.5, 10) composites increased by 65%, 87% and 96%, respectively, owing to the strengthening mechanisms of grain refinement strengthening, Orowan strengthening and load-bearing effects.

scholarly journals EFFECT OF SOLUTIONISING TIME ON MECHANICAL PROPERTIES OF SQUEEZE CASTED AL 6082 – SICP COMPOSITE

2013 ◽  
pp. 35-40
Author(s):  
R. GANESH ◽  
M.S. AZHAKESH ◽  
C. BALACHANDRAN ◽  
K. CHANDRASEKARAN
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
High Performance ◽  
Squeeze Casting ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Structural Components ◽  
Fine Particulates ◽  
6082 Aluminum Alloy

Aluminum matrix composites refer to the class of light weight high performance aluminum centric material systems. The unique tailorability of the composite materials for the specific requirements makes these materials more popular in a variety of applications such as aerospace, automotive (pistons, cylinders, liners, bearings), and structural components, resulting in savings of material and energy. In this project, fabrication of Aluminum MMC by liquid metallurgy route (Squeeze Casting) is discussed in detail. The mechanical properties of 6082 aluminum alloy discontinuously – reinforced with fine particulates of SiCp reinforcement and solutionising time during heat treatment of the composite on hardness, density and impact strength have been evaluated. The cardinal reasons behind the variation in the hardness and impact strength have been discussed.

Semi-solid Formgebung von AMC-Werkstoffen*/Semi-solid forming of AMC materials - Potential of a new process flow for high performance components

2015 ◽  
Vol 105 (10) ◽  
pp. 669-673
Author(s):  
C. Seyboldt ◽  
T. Schubert ◽  
O. Gerlach ◽  
M. Liewald ◽  
T. Weißgärber ◽  
...  
Keyword(s):  
High Performance ◽  
Aluminum Matrix ◽  
Dimensional Accuracy ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Process Flow ◽  
Forming Technology ◽  
New Process ◽  
Semi Solid ◽  
Complex Parts

Hinsichtlich der Verarbeitung von partikelverstärkten Aluminiummatrix-Verbundwerkstoffen (AMC) zu komplexen Bauteilen mit hoher Endkonturnähe, Maßhaltigkeit und hervorragenden mechanischen Eigenschaften bietet die Formgebung im teilflüssigen Zustand aussichtsreiche Perspektiven. In diesem Zusammenhang beschreibt der Fachbeitrag eine neuentwickelte Prozessroute zur Herstellung von Hochleistungskomponenten aus solchen AMC-Werkstoffen und zeigt deren Potentiale auf.   With regard to the processing of particle-reinforced aluminum matrix composites (AMC) into complex parts with net-shape quality, high dimensional accuracy and favorable mechanical properties, the semi-solid forming technology provides good perspectives. In this context, this article deals with a new process flow for the production of high-performance components from such AMC materials and presents its potential.

scholarly journals Selective Laser Melting of Al-Based Matrix Composites with Al2O3 Reinforcement: Features and Advantages

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2648
Author(s):  
Ivan A. Pelevin ◽  
Anton Yu. Nalivaiko ◽  
Dmitriy Yu. Ozherelkov ◽  
Alexander S. Shinkaryov ◽  
Stanislav V. Chernyshikhin ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
High Performance ◽  
Aluminum Matrix ◽  
Modern Method ◽  
Homogeneous Distribution ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Powder Preparation ◽  
Laser Melting ◽  
Conventional Methods

Aluminum matrix composites (AMC) are of great interest and importance as high-performance materials with enhanced mechanical properties. Al2O3 is a commonly used reinforcement in AMCs fabricated by means of various technological methods, including casting and sintering. Selective laser melting (SLM) is a suitable modern method of the fabrication of net-shape fully dense parts from AMC with alumina. The main results, achievements, and difficulties of SLM applied to AMCs with alumina are discussed in this review and compared with conventional methods. It was shown that the initial powder preparation, namely the particle size distribution, sphericity, and thorough mixing, affected the final microstructure and properties of SLMed materials drastically. The distribution of reinforcing particles tends to consolidate the near-melting pool-edges process because of pushing by the liquid–solid interface during the solidification process that is a common problem of various fabrication methods. The achievement of an homogeneous distribution was shown to be possible through both the thorough mixing of the initial powders and the precise optimization of SLM parameters. The strength of the AMCs fabricated by the SLM method was relatively low compared with materials produced by conventional methods, while for superior relative densities of more than 99%, hardness and tribological properties were obtained, making SLM a promising method for the Al-based matrix composites with Al2O3.

scholarly journals Grain Growth Control of ZnO-V2O5-Cr2O3 Based Varistors by PrMnO3 Addition

2021 ◽  
Author(s):  
Chankun Cai ◽  
Yu Shi ◽  
Manyi Xie ◽  
Ke Xue ◽  
Maofeng Xu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Apparent Activation Energy ◽  
Size Distribution ◽  
Grain Growth ◽  
Growth Control ◽  
Growth Behaviour ◽  
Grain Sizes ◽  
Pinning Effect ◽  
Average Grain Size

Abstract In this work, the grain growth behaviour of ZnO+V2O5(1 mol%)+Cr2O3(0.35 mol%)-based ceramics with 0.25–0.75 mol% additions of PrMnO3 was systematically investigated during sintering from 850°C to 925°C with the aim to control the ZnO grain size for their application as varistors. It was found that with the increased addition of PrMnO3, not only did the average grain size decrease, but the grain size distribution also narrowed and eventually changed from a bimodal to unimodal distribution after a 0.75 mol% PrMnO3 addition. The grain growth control was achieved by a pinning effect of the secondary ZnCr2O4 and PrVO4 phases at the ZnO grain boundaries. The apparent activation energy of the ZnO grain growth in these ceramics was found to increase with increased additions of PrVO4; hence, the observed reduction in the ZnO grain sizes.

Using explosive energy for processing aluminum matrix composites

2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-119-Pr9-122
Author(s):  
V. Popov ◽  
V. Gulbin ◽  
E. Sungurov
Keyword(s):  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Explosive Energy
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