scholarly journals High shear dispersion technology prior to twin roll casting for high performance magnesium/SiC p metal matrix composite strip fabrication

2016 ◽  
Vol 90 ◽  
pp. 349-358 ◽  
Author(s):  
Xinliang Yang ◽  
Yan Huang ◽  
Nilam S. Barekar ◽  
Sanjeev Das ◽  
Ian C. Stone ◽  
...  
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
High Performance ◽  
High Shear ◽  
Twin Roll Casting ◽  
Shear Dispersion ◽  
Roll Casting ◽  
Twin Roll

Twin Roll Casting and Melt Conditioned Twin-Roll Casting of Magnesium

2008 ◽  
Vol 141-143 ◽  
pp. 195-200 ◽  
Author(s):  
Zan Bian ◽  
I. Bayandorian ◽  
H.W. Zhang ◽  
Z. Fan
Keyword(s):  
Central Line ◽  
Innovative Technology ◽  
Al Alloy ◽  
High Shear ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Technology Process ◽  
Twin Screw ◽  
Mean Size ◽  
Twin Roll

Recently, BCAST at Brunel University has developed a MCAST (melt conditioning by advanced shear technology) process for conditioning liquid metal at temperature either above or bellow the alloy liquidus using a high shear twin-screw mechanism. The MCAST process has now been combined with the twin roll casting (TRC) process to form an innovative technology, namely, the melt conditioned twin roll casting (MC-TRC) process for casting Al-alloy and Mg-alloy strips. During the MC-TRC process, liquid alloy with a specified temperature is continuously fed into the MCAST machine. By intensive shearing under the high shear rate and high intensity of turbulence, the liquid is transformed into conditioned melt with uniform temperature and composition throughout the whole volume. The conditioned melt is then fed continuously into the twin-roll caster for strip production. The experimental results show that the AZ91D MC-TRC strips with different thicknesses have fine and uniform microstructure. The strip consists of equiaxed grains with a mean size of 60-70μm. The strip displays extremely uniform grain size and composition throughout the whole cross-section. Investigation also shows that both TRC and MC-TRC processes with reduced deformation are effective to reduce the formation of defects, particularly the formation of the central line segregations.

scholarly journals Twin-Roll Casting after Intensive Melt Shearing and Subsequent Rolling of an AM30 Magnesium Alloy with Addition of CaO and SiC

2015 ◽  
Vol 828-829 ◽  
pp. 35-40 ◽  
Author(s):  
Hajo Dieringa ◽  
Sanjeev Das ◽  
Dmitry Eskin ◽  
Zhong Yun Fan ◽  
Lydia Katsarou ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Magnesium Alloy ◽  
High Performance ◽  
The European Union ◽  
Twin Roll Casting ◽  
Melt Treatment ◽  
Roll Casting ◽  
Wrought Magnesium Alloy ◽  
Magnesium Melt ◽  
Twin Roll

Intensive melt shearing is a process that can be used for mixing ceramic particles into magnesium melt. It applies shear stress to the melt and can de-agglomerate nanoparticle additions to magnesium melts without the use of electromagnetic fields or ultrasound. A wrought magnesium alloy AM30 was selected for processing with intensive melt shearing and subsequent twin-roll casting. AM30 with additions of CaO and SiC were also processed by this route and the hardness and microstructure were investigated. Sheets were rolled and their tensile strength was determined. The work was done as part of the European Union research project ExoMet. Its target includes the production of high-performance magnesium-based materials by exploring novel grain refinement and nanoparticle addition in conjunction with melt treatment by means of external fields.

Dimensionally Stable Optical Metering Structures With NiTi Composites Fabricated Through Ultrasonic Additive Manufacturing

2013 ◽  
Author(s):  
Phillip Evans ◽  
Marcelo Dapino ◽  
Ryan Hahnlen ◽  
Joshua Pritchard
Keyword(s):  
Additive Manufacturing ◽  
Thermal Diffusivity ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
High Performance ◽  
Coefficient Of Thermal Expansion ◽  
Space Applications ◽  
Ultrasonic Additive Manufacturing ◽  
Specific Stiffness

High performance optical metering structures in airborne and space applications need to exhibit dimensional stability in demanding thermal and mechanical environments. Materials for this application should have a low coefficient of thermal expansion, high thermal diffusivity, high specific stiffness and exhibit good ductility. Current materials are limited in one or more of these properties. Common choices are invar, carbonfiber composite, and silicon-carbide. The former has low specific stiffness and thermal diffusivity and the latter choices are brittle materials that require special care and have slow manufacturing processes. In this work, the development of a thermally invariant metal matrix composite will be described along with its incorporation into a high performance optical metering structure. The material is a composite of super-elastic NiTi ribbons and aluminum, where the ribbons are embedded using ultrasonic additive manufacturing. Measurements and modeling of the thermo-elastic response will be presented followed by the design and manufacture of a metering structure. The metering structure design eases integration with an optical bench and lens bezels while leveraging the advantageous properties of this new metal matrix composite.

Thermal Analysis of Kenaf Sandwich Panel

2013 ◽  
Vol 812 ◽  
pp. 271-274
Author(s):  
Johari Nor Hasnidawani ◽  
Noor Azlina Hassan ◽  
Zahurin Halim
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
High Performance ◽  
Sandwich Panel ◽  
Galvanized Steel ◽  
New Approach ◽  
Composite Sandwich ◽  
Analytical Tools

The introduction of the eco-core sandwich panel composite is contributing a new approach to the designer to achieve high performance and light weight. In this research project, the new kenaf eco-core sandwich panel will be developed and then laminated with galvanized steel. The final goal is to find the optimum eco-core metal matrix composite sandwich structure with maximum mechanical properties such as stiffness and buckling. Kenaf eco-core sandwich will be fabricated and study on the interaction between eco-core sandwich panel and metal faces will be performed. The characterization of the eco-core sandwich panel will be done using different analytical tools. This study would provide a way to enhance the application of this new eco-core metal matrix composite sandwich structure.The amount of sample used was approximately 12 mg. The temperature profile was from 27°C to 1000°C at a heating rate of 10°C/min. In this study, result shows that degradation of composites starts to occur at about 180°C. Increasing the kenaf percent ratio will decrease the percent residue.

Enhancement of Wettability of Aluminum Based Silicon Carbide Reinforced Particulate Metal Matrix Composite

2014 ◽  
Vol 0 (0) ◽  
Author(s):  
V. K. Singh ◽  
Sakshi Chauhan ◽  
P. C. Gope ◽  
A. K. Chaudhary
Keyword(s):  
Silicon Carbide ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
High Performance ◽  
Low Cost ◽  
Cast Aluminum ◽  
Dispersion Phase ◽  
Particulate Metal ◽  
The Matrix

AbstractLately, materials research has shifted to composite materials from monolithic, adjusting to the global need for light weight, low cost, quality, and high performance in structural materials. Every effort aims to develop a material which can be appropriate for various industry and machinery purpose. In the present study, a modest attempt has been made to develop cast aluminum based silicon carbide (SiC) particulate metal matrix composite (MMC) and worked upon to raise the wettability factor between the matrix and dispersion phase. Magnesium (Mg) is used as wetting agent. It works by scavenging the oxygen from dispersoids surface and thinning the gas layer around dispersoids and this is done by forming MgO or MgAl

TEM examination of 2014-SiC metal matrix composite

1988 ◽  
Vol 46 ◽  
pp. 726-727
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
P. K. Liaw
Keyword(s):  
Metal Matrix Composite ◽  
Metal Matrix Composites ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Tensile Deformation ◽  
Microstructural Characterization ◽  
Thin Foil ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Ion Milling

Aluminum-based metal matrix composites offer unique combinations of high specific strength and high stiffness. The improvement in strength and stiffness is related to the particulate reinforcement and the particular matrix alloy chosen. In this way, the metal matrix composite can be tailored for specific materials applications. The microstructural characterization of metal matrix composites is thus important in the development of these materials. In this study, the structure of a p/m 2014-SiC particulate metal matrix composite has been examined after extrusion and tensile deformation.Thin-foil specimens of the 2014-20 vol.% SiCp metal matrix composite were prepared by dimpling to approximately 35 μm prior to ion-milling using a Gatan Dual Ion Mill equipped with a cold stage. These samples were then examined in a Philips 400T TEM/STEM operated at 120 kV. Two material conditions were evaluated: after extrusion (80:1); and after tensile deformation at 250°C.

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