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Aging behavior of Cu-Cr-Zr-Y alloy LIU Yong1,a, WANG Dejun2,b and TIAN Baohong1,c 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China 2College of Mechanical and Electric Engineering, Hebi Vocation and Technology College, Hebi 458030, China aliuyong@mail.haust.edu.cn, bwangdejun63@163.com, ctianbh@mail.haust.edu.cn Keywords: Cu-Cr-Zr-Y alloy, cold working, aging, high strength and high conductivity, mechanical properties.
Choosing the better comprehensive aging process (480 °C×2 hours) to do 1st drawing + aging + the 2nd drawing will finally produce different size wires (different deformations), that can be used for the mechanical properties testing.
(b) (a) Fig. 1 Conductivity (a) and microhardness (b) of the soluted alloy after aging at 480 °C under various cold working That major factor that impacts the electrical conductivity in the copper alloy is the electron scattering affect from the solution atom in the substratum.
This is in line with the good comprehensive properties of the alloy specially the high micro-harness with 60% deformation rate and aging at 480 °C for 2 hours.
Mechanical properties.

The bioactivity of HA is determined by chemical factors, physical factors, and ion exchange reaction between HA and body fluid forming apatite layer that equivalent to the mineral phase on the human bone.
Therefore, the HA coating will combine the good mechanical properties of titanium and bioactivity of HA to produce a better orthopedic implant [6, 11].
Ouchi, “Effect of b Phase Stability at Room Temperature on Mechanical Properties in b -Rich a ؉ b Type Ti – 4 . 5Al – 3V – 2Mo – 2Fe Alloy,” ISIJ Int., vol. 42, no. 2, pp. 191–199, 2002
Akahori, “Mechanical properties of Ti – 4 . 5Al – 3V – 2Mo – 2Fe and possibility for healthcare applications,” Mater.
Benhayoune, “Electrophoretic deposition (EPD) of nano-hydroxyapatite coatings with improved mechanical properties on prosthetic Ti6Al4V substrates,” Surf.

The important properties studied are moisture content, total clay content, grain fineness number, and grain shape.
The shape, size, composition, and purity of the sand are important factors to the success of the mold making operation [6, 7].
The size distribution of the sand affects the quality of the castings.
The sand properties was investigated to determine its possible use in the metal casting.
Properties of the sand investigated are grain shape, moisture content, clay content, and grain size and distribution.

By a laser induced pre-treatment, the material properties are locally changed so that influencing the material flow is possible.
In this process the mechanical properties are locally modified by local heat treatment that causes microstructural changes.
An optimisation of the mechanical properties adapted to the component demands can be obtained, for example, using a CO2 laser.
Other publications on laser induced heating of aluminium alloys have shown that the mechanical properties can be influenced directly by short-time laser heating [2-4].
Experimental results Materials properties, after the bulk and local (laser) heat treatments, were evaluated by microhardness measurements.

There are environmental factors such as ultraviolet light, temperature and moisture which affect mechanical properties very slowly in the long period of service.
Currently the standard tests used by industry to evaluate the long-term performance of composites involve only one or at most two influencing factors.
However in-service composites are subjected to aging by a combination of factors including heat, ozone, oxygen, ultraviolet light and liquids.
The effects of the interactions between these factors on aging are essentially unknown.
The mechanical properties are listed in Table 1.

This kind of alloys possesses excellent mechanical properties, such as high strength, high hardness, improved wear resistance, and increased corrosion resistance [8].
Their bio-properties are analyzed in comparison to that of the Zr52.5Cu17.9Ni14.6Al10.0Ti5.0 BMG and Ti alloy.
The material surface has been acknowledged as one of the most significant factors for successful outcome in bone tissue healing [13, 14].
The result shows that the properties of BMG and BMGMC can hardly influence cell attachment.
Bauer, Mg-based bulk metallic glass composite with high bio-corrosion resistance and excellent mechanical properties, Intermetallics. 29(2012) 56-60

Study on Calculation Theory of Elastic Flexural-torsional Buckling Bearing Capacity for Castellated Beams Xiangrong Chen 1, a, Hailong Yuan 1,b, Xing Chen1,c, Zhenwen Liu1,d 1 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China email: acxr90@126.com, byzl8801@126.com, ccx0411@sina.com, dhippohappy@163.com Keywords: castellated beams; elastic flexural-torsional buckling; calculation theory; influence factors Abstract: The structure of castellated beams is complex, using the computation theory of elastic flexural-torsional buckling of H-shaped beams to study the elastic flexural-torsional buckling strength of castellated beams under different loads, based on simplifying the section's eigenvalues.
Introduction Castellated beams are made by cutting the I beams or H-shaped beams along the dog-leg path on the web and rejoining the two halves by welding, which are widely used in practical engineering as the superior mechanical properties and yield good economic returns.
Analysis of influence factors on the elastic flexural-torsional buckling of castellated beams 5 castellated beams were designed and analyzed by the ABAQUS software to text the effects that divergence ratio had on the elastic flexural-torsional buckling critical load, keeping span and distance- height ratio as fixed constants, just chang the divergence ratio.
13.126 133.459 2 1.4 420 200 8400 0.35 63.380 13.414 133.702 3 1.5 450 200 8400 0.35 64.853 13.728 142.082 4 1.6 480 200 8400 0.35 66.481 14.074 146.836 5 1.7 510 200 8400 0.35 68.114 14.418 151.368 It can be seen from Table 3,4 that the influence of distance-height ratio on the elastic flexural- torsional buckling bearing capacity of castellated beams is small, as the increment of distance-height ratio the change of the bearing capacity is less, however ,the influence that depth-span ratio dose is great, with the decrease of depthspan ratio the bearing capacity declines linearly, the divergence ratio also affects
Conclusions Conclusions are drawn from the research of calculation theory and finite element analysis： (1)The reduced calculation methods for section eigenvalues of castellated beams are of high accuracy and the calculation formulas are simple, which can be used to any hexagonal castellated beams, avoiding the computational difficulty brought by the complex structure.(2)After the simplified calculation for eigenvalues of castellated beams, the computation formulas of elastic flexural- torsional buckling bearing capacity for plain girders can be used to calculate the bearing capacity of castellated beams, which are simple and of high accuracy.(3)Through the analysis of affecting factors, it is concluded that depth-span ratio impacts the elastic flexural-torsional buckling bearing capacity of castellated beams greatly, the influence of divergence ratio is not obvious, the effect of distance- height ratio can be ignored.When designing, we should choose larger divergence ratio to increase

Due to its chemical composition and mechanical properties is can replace non-aesthetic caps or metal crowns.
Introduction Zirconium dioxide is a material which is unique in terms of its mechanical strength.
There have been performed numerous studies on determining the static mechanical properties of the material after synterisation; the process of hardening, however the available literature presents to very little extent the studies of determining the S-N curve.
A lack of the tendency of a definite relationship between those parameters shows that potentially other factors were essential, e.g. due to a considerable shrinkage of the material, the course of heating and cooling or the homogeneity of the material[4].
It can therefore be concluded that the conditions in which material is placed (water, dry environment) does not have critical affect on the mechanical properties.

The establishment of the finite element model of the chassis Material properties.
The actual chassis structure is complicated, so some of the parts are simplified as follows on the premise of truthfully reflecting the main mechanical properties of the structure in order to facilitate the modeling and analysis: (1) Ignore the impact of non-load bearing members.
(3) We can consider that the welding in the structure is the ideal, and material properties on the weld area are the same with the other regions.
Dynamic load coefficient is mainly determined by three factors: the road conditions, harvester structural parameters and the travel speed.
Because these factors are very complicated, dynamic load coefficient can not be determined through the method of mathematical analysis.

However, due to different metallurgical behaviour & mechanical properties, joining of dissimilar Al alloys presents a number of challenges.
In addition, in case of dissimilar work material it affects weld nugget microstructure & joint properties up to such extent that it has been taken as a process variable.
Besides, shifting tool pin-axis from weld centreline is also affecting dissimilar joint properties.
It was observed that the placement of the aluminum alloys in the different orders over each other affected the final weld quality & mechanical properties.
Further, mechanical properties and microstructures of the weld zone were studied with the aid of experimental observations and model predictions.