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The joint characteristics of Friction Stir Welded Mg-Zn-Y alloy Chang-Yong Lee1, a, Won-Bae Lee2,b , Yun-Mo Yeon3,c , Seung-Boo Jung 4,d 1,2,4Department of Advanced Materials Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea 3 Suwon Science College, Hwasung, Gyeonggi-do, 445-742, Korea a lcy011@skku.edu, bsaba38@skku.edu, cymyeon@ssc.ac.kr, d sbjung@skku.ac.kr Keywords: Friction Stir Welding, Mg-Zn-Y alloy, Microstructure, Mechanical properties Abstract.
Generally the second phase, such as precipitates, intermetallic compounds by additives, is one of the factors of hardening effect in the Mg alloy.[1] However, the original properties of Mg alloy change ill in the weld joints owing to the coarsening and dissolution of the second phase by the fusion and solidification during the conventional welding process.
We also observed the effects of microstructural issues on the mechanical properties near the weld zone.
The micro Vickers hardness and tensile strength tests were carried out to evaluate the mechanical properties of the joints.
The upper region(c) has coarser grains than that of the lower region(g).[4] In the TMAZ(Thermal and Mechanical Affected Zone)(f) next to the SZ, fine grains and coarse grains coexist.

Concrete has low tensile strength, and cracks by shrinks, chemical reactions, and other factors [3].
This article discusses the general concept, manufacturing processes, and mechanical properties of self-healing concrete. 2.
Mechanical strength recovery, durability improvement, and microstructural evaluation are the most commonly used techniques and methods for evaluating self-healing concrete. 4.1 Mechanical properties Concrete's mechanical properties primarily include compressive, flexural (3-point bending and 4-point bending), shear, and tensile strength.
The compressive strength test is one of the most commonly used to evaluate the mechanical properties of concrete.
Y., Factors affecting crack repairing capacity of bacteria-based self-healing concrete, Construction and Building Materials. 87 (2015) 1-7

Mechanical properties of as-extruded material were examined using compression test at 293-873K.
However, the effect of enhanced mechanical properties of RS material is observed only at low deformation temperatures.
Those factors are known to be beneficial for the materials, which are awaited to demonstrate a high thermal stability of their properties at elevated temperatures [6, 10].
Vojtěch et al. [6], Mitra [10] that high temperature treatment of Al-Cr [6] and Al-Fe-V-Si [10] alloys does not affect mechanical properties, which is related to high thermal stability of aluminide dispersoids morphology.
Sugamata, Microstructure and mechanical properties of rapidly solidified Al-Fe-Ni-Mg alloys, Mat.

Abstract: The paper presents the effect of alloying with WC and TaC powders on structure and mechanical properties of the X40CrMoV5-1 steel surface layer using the HPDL (High Power Diode Laser).
Introduction Laser surface treatment techniques are widely used for improving the mechanical, tribological and chemical properties of metal parts.
Tool steels feature are widely used group of tool materials, especially interesting because of their low price and very good functional properties.
Big inters in these steels gives the basis for carrying out investigations focused on the improvement of the functional properties of these materials [8-13].
Gołombek, Properties of composite Ti/TiN layers produced by in situ method with high power diode laser, Bulletin of Welding Institute 1 (2013) 23-29 (in Polish)

Although there is a key relationship between combustion effects and law of property changes, the researches on influence factors of oil property changes after emulsification were few.
Therefore, for making sure watered fuel oil could play a better role in energy saving and emission reduction, this research has studied on the measurement of viscosity influence and effect factors of watered fuel oil, which could provide the theoretical basis and foundation for technology application of watered fuel oil.
A study of the influential factors of emulsified heavy-oil (EHO) viscosity.
Droplet surface properties and rheology of concentrated oil in water emulsions stabilized by heat-modified β-Lactoglobulin B[J].
Research on water droplet size influencing factors in watered fuel oil prepared by mechanical agitation[C].

The swing-arm is an important component of led die bonder and its dynamic characteristics will directly affect the piece accuracy.
The theoretical basis of modal analysis Modal analysis is widely used to describe the dynamic properties of a structure in terms of the modal parameters i.e. natural frequencies, damping factors, and vibration modes.
By substitute Eq. (2) into Eq. (1) and eliminate the factor , We can obtain characteristic equations of Eq. (1)
The accuracy will be affected.
Modern Mechanical Dynamics and Application (Mechanical Industry Press, Beijing 2002)

The investigation focuses on critical factors, including tensile stress levels, lower critical stress (LCS), and time to failure (TTF).
Hardness profiles were measured across the weld metal, heat-affected zone (HAZ), and base metal.
Chemical compositions and mechanical properties of each material are given in Table 1 and Table 2 respectively.
Mechanical properties of test materials [1] Yield strength Rp0.2 (MPa) Tensile strength Rp0.2 (MPa) Elongation (%) SKD11 154 231 65 Implant Testing In this work, the susceptibility to weld cold cracking was systematically evaluated using the implant test, following ISO 17642-3.
This suggests that while tempering improves the toughness and reduces hardness to some extent, it may not be sufficient to fully mitigate the factors influencing cold cracking in SKD 11 steel.

Higher content of silica in geopolymer coating resulted in better thermal properties.
Both researchers claimed that factors such as high ratio of Si/Al and low water content resulted in better thermal properties.
The objective of this study was to screen and identify the significant factors that mostly influence the fire retardant properties of geopolymer coating based on RHA.
In addition, fire performance and material characteristic was studied to help in understanding the impact of each factor on the material properties.
Synthesis factors affecting mechanical properties, microstructure, and chemical composition of red mud–fly ash based geopolymers," Fuel, vol. 134, pp. 315-325, 2014.

MODELLING OF NITROGEN DEPOSITION PRESSURE EFFECT ON GRAIN SIZE DEVELOPMENT AND MECHANICAL PROPERTIES OF NANOCRYSTALLINE TERNARY NITRIDE COATINGS R.
In deposition of complex ternary nitride coatings, the nitrogen deposition pressure plays an important role in structural evolution of the coatings leading to development of different mechanical properties.
Despite these extensive studies, quantitative models related to the effect of nitrogen deposition pressure on microstructure and mechanical properties of the coatings are still lacking.
As reported in recent studies by the authors [9-11], with increasing nitrogen deposition pressure, the deposition rate and composition of the coatings change, which in turn affect the microstructural development and mechanical properties of the coatings.
The number and kinetic energy of the depositing atoms/molecules have been considered as major factors determining the adatom mobility and formation of the nucleated clusters, which in turn determine the microstructure and surface morphology of the films.

But as much as it is aimed to produce functional 3D printed components with exemplary mechanical properties, issues with anisotropy and reduced mechanical properties compared to the components produced using the conventional techniques also tend to arise in the FDM technique [11–14].
One of the important factors that dictate the properties of the 3D printed component is the type of materials used.
Mechanical Properties.
This also implies the interfacial bonding within the microstructure of the 3D printed material, which increased the mechanical properties.
The presence of these voids is the primary reason for the decrease in the mechanical properties of the said blend.