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III-N materials have a direct bandgap spanning from 0.7 eV to 6.2 eV and their tunable optical emissions range varies from infrared to ultraviolet, making them suitable for optoelectronic devices.
III-N materials are commonly investigated in light-emitting optoelectronics [2-5].
Development conditions that did not allow high-quality non-doped GaN were not effectively controlled; The GaN materials produced were primarily n-doped, with electron concentrations ranging from 1018 to 1020cm-3.
Richardson, Visible emission from amorphous AlN thin-film phosphors with Cu, Mn, or Cr, Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 19(4) (2001) 1894-1897
Shionoya, Energy transfer processes in Er3+‐and Yb3+‐doped infrared upconversion materials, Journal of applied physics. 78(2) (1995) 1219-1223

Computational Materials Science, 2014, 86, 24-29
Materials Science Forum,2019,956:332-341
Materials Science Forum, 2019, 956: 46-54
Computational Materials Science, 2014, 83, 27-34
International Journal of Advanced Materials and Production, 2016, 1(1), 62-68

The threshold stress level strongly differs for the different materials.
Stanzl-Tschegg, Influence of loading frequency on the high cycle fatigue properties of AlZnMgCu1.5 aluminium alloy, Materials Science and Engineering A314 (2001), 48-54
Beck, Upgrading of an ultrasonic fatigue testing machine by means of early stage damage detection, MP Materials Testing 55 (2013) 78-83
Topper, A stress-strain function for the fatigue of metals, Journal of Materials 4 (1970) 767-778
Chawla, Environmental effects on fatigue crack growth in 7075 aluminum alloy, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 43 (2012) 2799-2809.

There are various types of gears and made of metallic materials and non-metallic materials.
Non-metallic materials include wood, polymer, and natural fiber, etc.
Material Selection and Methods 2.1 Materials Nylon 6 and glass fiber are important elements in composites materials.
Series: Materials Science and Engineering 114 – 012118, 2016
Caribbean Journal of Science.

Introduction Multi-purpose smart materials are used in the realization of smart structures since they have self diagnostic and self controlling capacity.
Such problems are overcome by using the Functionally Graded Materials (FGM) which are microscopically inhomogeneous composite materials exhibiting smooth and continuous change of material properties along the thickness direction.
Stainless steel is high strength material but it can rust in extreme cases and aluminum doesn’t rust but it is low strength material.
[5] Shen H S: Thermal postbuckling behavior of shear deformable FGM plates with temperature-dependent properties, International Journal of Mechanical Sciences, Vol. 49 p. 466–78 (2007)
[9] Javaheri R and Eslami M R: Buckling of functionally graded plates under in-plane compressive loading, Journal of Applied Mathematics and Mechanics, Vol. 82 p. 277-83 (2000)

However, mild steel is poor corrosion resistance materials.
It can be applied as coating materials in order to prevent surface corrosion reaction.
Younan: submitted to Arabian Journal of Chemistry (2014) [4] L.
He: Progress in Materials Science Vol. 61 (2014), p. 94 [5] A.
Zhang: Materials Characterization Vol. 99 (2015), p. 200 [18] L.

Applications of Natural Rocks as Heat-Storage Materials for Food Drying in Sub-Saharan Africa Aldé Belgard Tchicaya Loemba1,a*, Baraka Kichonge1,2,b, Thomas Kivevele1,c 1School of Materials, Energy, Water and Environmental Sciences (MEWES), The Nelson Mandela African Institution of Science and Technology (NM-AIST), Tanzania P.O.
The most common materials for heat storage are water, essential oils, rocks, concrete, phase change materials, calcium, and zeolite.
The integration of storage materials resulted in excellent performance for all materials tested.
Journal of Energy Storage, 2022. 55: p. 105860
International Journal of Thermofluids, 2023. 18: p. 100326

One of the significant advantages of functionally graded materials (FGMs) over conventional materials is the elimination of the interface issues related to typical composite materials.
The effect of longitudinal inhomogeneity parameter on the transverse displacement of functionally graded materials beam is plotted in Figure 3.
Journal of Mechanical Science and Technology 35 (2021): 1099-1108. https://doi.org/10.1007/ s12206-021-0223-y [13] Zenkour, Ashraf M.
International journal of mechanical sciences 51.11-12 (2009): 869-880. https://doi.org/10.1016/j.ijmecsci.2009.09.026 [14] Talha, Mohammad, and B.N. 
Journal of Mechanical Science and Technology 30 (2016): 1253-1264. https://doi.org/10.1007/s12206-016-0229-z [18] Mahi, Amale, and Abdelouahed Tounsi.

Abstract The use of waste materials is one of the options for sustainable construction.
Hence for sustainability, alternate materials are to be used to replace these materials.
Table.1 shows the basic properties of constituent materials.
Additional Readings Ajinkya Kaware ‘Analysis of bamboo reinforce Concrete column’, International Journal of Innovative Research in Science, Engineering and Technology.
[7] Adom-Asamoah, A comparative study of Bamboo reinforced concrete beams using different stirrup materials for rural construction, International journal of Civil and Structural Engineering.

It is probably one of the hardest and most non-corrosive materials known in industrial as well as research field.
Authors concluded that electrochemical machining is the choice of machining of these materials.
ECM is known to be used in the fields where parts with difficult-to-cut materials and complex geometry.
Padmanabhan, Effect of process variables on metal removal rate in electrochemical machining of Al-B4C composites, Archives of Applied Science Research, 4 (4), 2012, pp 1844-1849
Padmanabhan, Linear Modelling of the Electrochemical Machining Process Using Full Factorial Design of Experiments, Journal of Advanced Mechanical Engineering,1,2013, pp13-23