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Through research 4Cr9Si2 Martensitic steels, can provide a theoretical basis for other similar materials, such as 4Cr13 and so on.
The software—Deform comes with no flow stress of 4Cr9Si2 alloy materials in its library.
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Multi-material: FGM Functional graded materials (FGM) are an advanced class of materials having unique qualities that vary spatially in a regulated way.
Using WAAM to deposit multiple materials, FGMs can be created with controlled material properties.
Colegrove, Wire + Arc additive manufacturing, Materials Science and Technology (United Kingdom) 32 (2016) 641–647. https://doi.org/10.1179/1743284715Y.0000000073
Kim, Repair of damaged parts using wire arc additive manufacturing in machine tools, Journal of Materials Research and Technology 16 (2022) 13–24. https://doi.org/10.1016/j.jmrt.2021.11.156
Sutrave, Improving mechanical properties of additive manufactured AZ31 by mechanical rolling, International Journal of Materials Research 114 (2023) 231–237. https://doi.org/10.1515/ijmr-2022-0354

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Attention has been given to the use of residues and natural materials rich in Si and Al, such as diatomite.
Materials and Methods Starting materials.
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The double shear unified strength theory for the plane-strain problem Because Mohr-Coulomb’s strength criterion and other common strength theory couldn’t reflect the effect of intermediate principal stress, YU Maohong constructed the double shear unified strength theory which can consider the intermediate principal stress in 1983, and the formula of the double shear unified strength theory for the soil materials under the plane strain condition can be expressed as [1].
or (1) where In which,, are respectively the cohesion and internal friction angle of materials: ,,are respectively the first ,the second and the third principal stress: is the parameter of intermediate principal stress.
Acknowledgements This work was financially supported by the National Natural Science Fund Project (51278121).
References [1] Yu maohong:The double shear unified strength theory(Science Press, Beijing, China 1998) (in Chinese) [2] Vesic,A.S.
) (in Chinese) [15] Kamke.K.in:Handbook ordinary differential equation,edit by Science Press, Beijing,China(1977),(in Chinese)

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Fig.4 Diffusion of Nano Aluminum oxide in copper matrix Shape modification.With the development of fine materials manufacturing industry, there is an increasing demand for fine raw material.
The exact component varies with different raw materials.
[27] Yufen Yang, Guosheng Gai, Zhenfang Cai, Maobai Lai, Qingru Chen, Surface Modification of Purified Fly Ash and Application in Polymer, Journal of Hazardous Materials, Vol.133(2006) , p.276-282
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Foreword The 4th International Conference on Materials and Manufacturing Technologies, MATEHN'06, was held in Cluj-Napoca, Romania, at EUROPA CONFERENCE CENTER, between 21 and 23 September 2006.
The Conference has been organized by Technical University of Cluj-Napoca and Romanian Ministry of Education and Research in collaboration with Romanian Academy of Technical Science.
Conference Committee has decided to publish the proceeding as follows: • the papers presented in Advanced Materials Section will be published in a special issue of the Journal of Optoelectronics and Advanced Materials, an ISI quoted journal (Impact Factor/2005 1.138) • the papers presented in other conference sections (Metal Forming, Powder Metallurgy, Heat Treatment and Surface Engineering, Metal Casting and Metal Welding, Quality and Environmental Aspects) are published in this volume, as a volume of the series "Advanced Materials Research", edited by Trans.
The present volume provides up-to-date, comprehensive and worldwide state-of -the art knowledge in the science and technology of materials including powder metallurgy, metal forming, heat treating and surface engineering, metal casting and metal welding and quality and environmental aspects.
We hope that the contents of this volume will prove useful for materials and their technologies researchers and practitioners in developing and applying new materials and processes.

MMCs are made of at least two different materials: reinforcement and matrix [2].
Liu, Advanced Lightweight Structural Materials for Automobiles: Properties, Manipulation, and Perspective, Science of Advanced Materials 16(5) (2024) 563–580
Chowdhury, Advances of composite materials in automobile applications–A review, Journal of Engineering Research (2024)
Kumar, Hardness and tensile properties of prophylactic knee brace produced from cow bone and periwinkle shell composites, International Journal of Engineering Materials and Manufacture 4(2) (2019) 41–47
Sahu, Microstructure and Mechanical Behaviour of Al/SiC/Agro-Waste RHA Hybrid Metal Matrix Composite, Journal of Composites and Advanced Materials 30(1) (2020).