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Aluminum and its alloys are the second used materials after steels due to their useful and attractive properties.
Materials and Experimental Procedures Materials.
Different materials have been used in this work such as: commercially pure Al (99.8 %), high purity Cu and V, pure graphite crucible and pure graphite rods.
Dowling: Mechanical behavior of materials. 4th ed., New Jersey: Prentice Hall; (2012)
Wagner: Mechanical surface treatments on titanium, aluminum and magnesium alloys, Materials Science and Engineering A, Vol. 263 (1999) p. 210–216

Jain, “Experimental investigations of cutting parameters influence on cutting forces and surface roughness in finish hard turning of MDN250 steel”, Journal of Materials Processing Technology, 206 (2008), p.167-179
Samuel, “Machinability investigations on hardened AISI 4340 steel using coated carbide insert”, International Journal of Refractory Metals & Hard Materials, 33 (2012), p.75-86
Durejac, J., “Effect of tool geometry variation on finish turning – A Review”, Journal of Engineering Science and Technology Review, 4 (2011), p.1-13
Davim, “Machinability investigations in hard turning of AISI D2 cold work tool steel with conventional and wiper ceramic inserts”, International Journal of Refractory Metals & Hard Materials, 27 (2009), p.754-763
Boulanouar, “High speed turning for hard material with PCBN inserts: tool wear analysis”, İnternational Journal of Machining and Machinability of Materials, 3 (2008), p.62-79

Metamaterials are artificial composite structures or composite materials, which possess supernormal physical properties that natural materials don’t have.
Through orderly designing the structures in the critical physical size of materials, we can render the materials to break through some restriction in some certain apparent natural laws.
He presented that these materials have negative permittivity and negative permeability simultaneously in special frequency range.
Therefore, the first left-handed materials come out to human being [3].
And the founding of left-handed materials has been selected as one of the “ten key” scientific breakthrough by American <<Science>>magazine in 2003, which triggered worldwide research on this new material.

SiC-composites are candidate structural materials for high temperature applications such as gas turbines.
The barrier materials were surface coated on the substrates by plasma spray method.
Journal of the European Ceramics Society 22 (2002), p. 2741-2747
Current Opinion in Solid State and Materials Science 5 (2001), p.301-309
Journal of Materials Science Letters 21, 2002, p.121-124

Material Flow and Grain Deformation During Extrusion Y.
Aernoudt, "Large Strain Work Hardening and Textures," Progress in Materials Science, vol. 25, pp. 69-412, 1981
Bhadeshia, "Topology of grain deformation," Materials Science and Technology, vol. 14, pp. 832-834, 1998
Tekkaya, "Grain size evolution simulation in aluminium alloys AA 6082 and AA 7020 during hot forward extrusion process," Materials Science and Technology, vol. 29, no. 1, pp. 100-110, 2013
Poole, "Numerical modelling of the material flow during extrusion of aluminium alloys and transverse weld formation," Journal of Materials Processing Technology, vol. 214, no. 3, pp. 688-700, 2014

In order to obtain excellent properties of the materials, several methods have been investigated in recent years.
Then after ball-milled for another 24h, the mixture of materials was calcined at 920 °C with 4 wt% Bi2O3 and at 1150 ºC without Bi2O3 in air and held for 5h.
The hysteresis loops of La-substituted hexaferrites show a behavior of the hard magnetic materials with high coercive field, as shown in Fig.3.
Landgraf, D.Rodrigues, Journal of Magnetism and Magnetic Materials 238(2002) 168-172
Materials Research Bulletion 43(2008) 176-184

In that hash environment, conventional metal materials cannot be competent and high temperature resistant composite materials have to be applied.
The high temperature caused by aerodynamic heating changes the properties of the vehicle materials and structures, leading to changes in the vibration characteristics of the wings and rudder.
Huang: International Journal of Mechanics and Materials in Design, Vol.6 (2010), p. 331
Wang: Journal of Experimental Mechanics.
Zhu: Materials and Design, Vol. 40(2012): p.502

Varis: Journal of Materials Processing Technology, Vol. 172 (2006) p. 130-138
Varis: Journal of Materials Processing Technology, Vol. 132 (2003) p. 242-249
Edwards: Materials Science Forum, Vol. 490 (2005) p. 294-299
Rao: Materials Science and Technology, Vol. 20 (2004) p. 261-269
Bhadeshia: Materials Science and Technology, Vol. 17 (2001) p. 355-365

Material Properties and Loading Conditions.
a connecting material, since it is a commercial product, elastic behavior was assumed as shown in Table 4 and material properties were applied to the properties of commonly used steel materials.
Acknowledgments This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (2021R1A6A1A03044326).
Kim, A Statistical Analysis of Results of Detailed Inspections on Aged Concrete Erosion Control Dams in Gyeongsangbuk-do, Journal of Korean Society of Forest Science. 111 (2022) 276–286
Im, Hydraulic Relation of Discharge and Velocity in Small, Steep Mountain Streams Using the Salt-dilution Method, Journal of korean society of forest science. 107 (2018) 158-165

Natural fiber reinforced composite materials are considered as one of the new class of engineering materials.
Materials and Methods 2.1 Materials Jute fabrics (hessian cloth) was collected from local market (Savar, Dhaka).
Eco-composite: the effects of the jute fiber treatments on the mechanical and environmental performance of the composite materials, Journal of Composite Materials, Vol. 45, No. 5, pp. 573-589
Effect of Silane Coupling Agent on the Flexural Property of Glass Fiber Reinforced Composite Film, Journal of Materials Science and Chemical Engineering, Vol. 2, pp.38-42
Experimental Investigation of Natural Fiber Reinforced Polymers, Materials Sciences and Applications, Vol. 3, pp. 59-66