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Due to occurrence of such elements as Fe, Cu, Mg, Mn in these alloys, the intermetallic phases crystallize additionally, affecting on the mechanical properties of the castings.
In the Al-Si-Cu alloys, the presence of copper also results in formation of the intermetallic phases (Al2Cu, Al5Mg8Cu2Si6) affecting on the mechanical properties, particularly on reduction of plastic properties [1].
However, it can be observed that the porosity affects on the reduction of the mechanical properties to a greater degree.
It should be reminded that in the mechanical properties sample this participation was practically impossible to identify.
Zajmovskij: Structure and mechanical properties of metals (in Polish) (WNT, Poland, 1973) [13] H.M.

The mechanical properties of the heat-treatable alloys are improved by solution heat treatment and controlled ageing.
AA2024 is a heat-treatable alloy and mechanical properties of the alloy can be improved by precipitation hardening process.
The mechanical properties of AA2024 become a substantially stable condition after 7 days with the natural ageing and the properties of the alloy will not change even after years [7].
So three levels L9 orthogonal array was used to investigate the effect of 4 factors.
The factors and their levels are given in Table 2.

However, it is difficult to homogeneously disperse fine h-BN particles into the matrix powder by using conventional mixing methods, while the inhomogeneous dispersion of flake h-BN grains will play a role of fracture origin to affect the mechanical properties [1~3].
Recently, it has been reported that nano-composites in which nano-sized particles dispersed within the matrix grains and/or at the grain boundary exhibit improved mechanical properties.
Microstructure and Properties.
Microstructure is also one of the most dominant factors, besides lower thermal conductivity of BN phase, which affects the thermal conductivity of BN-AlN composites.As seen from Fig.6, the thermal conductivity of BN-AlN composites prepared by nano-BN coated AlN powder is inferior to that of composites prepared by micrometer BN powder.
Nano-BN affects the BN-AlN composites microstructure, but also affects their properties.

The measurement results indicated that the milling technique affected both of physical and mechanical properties of the lead-free BZT ceramics.
Many reports have suggested that properties of BZT ceramics depended on many factors such as microstructures and dopants [5].
Relations between these factors and their properties have been extensively studied [6].
It seems that the mechanical properties were improved by milling technique.
For example, a higher density results in a better mechanical properties while a larger grain size produces a lower mechanical properties.

High temperature tensile properties of T23 are closely related to the alloy aging degree.
Therefore, it is of great practical significance to investigate the change of the microstructure and mechanical properties of T23 steel under different service time in real service environment.
In addition, the high temperature mechanical properties at 580℃ and 600℃ of T23 steel were studied by using machine of AG-IC 600, and the number of the test specimen under the same conditions were three.
The effect of pure matrix on is related to many factors such as dislocation density, sub-grain, grain size and so on.
Factors affecting the yield strength of T23 steel have the same effect on the tensile strength, causing the change regularity of tensile strength consistent with yield strength during the service process.

It was found that sintering temperature affected hardness property of the SFMs.
Employing prealloyed Cu-Sn powders provided SFMs with better mechanical properties compared to the SFMs made of admixed Cu and Sn powders.
Properties of the first and second SFMs groups were compared.
Wear rates may depend on factors, such as material soundness, base material or matrix integrity and material surface condition.
Improved mechanical, physical and tribological properties could be found in the the SFMs Series CS, which were produced via admixing of prealloyed Cu-Sn powders with other ingredients.

The mechanical properties are determined differently by the processing variables.
Fig. 4 shows the variations of the mechanical properties as function of the processing variables.
The distinct mechanical properties are determined differently by the processing variables.
Thermomechanical Environment-Mechanical Properties Relationships.
The distinct mechanical properties are determined differently by the processing variables.

Effect of Low Energy ECR Ion Beam Irradiation on Micro Nano Scale Mechanical Properties of Silicon Y.X.
If those parts are in micro nano scale such as micro interconnector, micro valve, micro actuator, and micro switch in that case micro nano mechanical properties is an important factor for better performance.
From data analysis It shows accelerating energy is an important factor to control mechanical property of material during nano scale fabrication by ion beam.
When ion beams are irradiated on surface of material for any fabrication, the major mechanical and surface properties have been changed due to irradiation effect.
The mechanical properties of irradiated Si are very sensitive to the amount of accelerating energy.

To develop such models, the scale of control volume considering strength, stiffness and deformability is one of important factors.
Meanwhile, the mechanical properties of mortar in fire problem are strongly related to temperature that mortars were experienced to.
During the life span, the structural concrete deteriorates owing to various factors.
In previous studies [8-11], it has been discovered that the various scales material properties, such as chemical decomposition, surface cracking or mechanical properties have been diminished due to fire exposure.
This can cause the reduction in mechanical properties of mortar.

The losses of the operating fluid under pressure are one of the factors which affect overall performance of the machines.
Some factors that affect the sealing properties of the joint are the material of the gasket, the shape of the gasket and the clamped flanges but also the stiffness of the whole assembly.
In the following text we are going to show what other factors can affect the problematic area of the joint.
There is also another factor affecting the pretension force and that is the surface finish of the flange under the bolt head.
Considering more variables could show us the worst case affecting the sealing properties of bolted joint.