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Valence electron structures analysis on relationship of Cu physical or mechanical properties and vacancy Yun Fei Wang 1, a, Yun Kai Li 1,b and Ming Xia 2,c 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China 2China Automobile Industry Enginnering Corportion, Luoyang, 471003, China awa1yun2fei3@163.com, bliyunkai@bit.edu.cn，c14652569@qq.com Keywords: mechanical properties; EET; valence electron structures; signal vacancy Abstract.
For the purpose of studying vacancy effect on physics and mechanics property, authors advance a method of calculating mono-vacancy cell valence construction, and get 5 phase construction factors nA, , , F and α on electron layer.
However, affect about defects on the relationship between physical and mechanical properties and valence electron structure has not been reported.
Contrasting valence electron structure of no vacancy Cu crystal cell and single vacancy Cu crystal cell, analyzing relationship of resistance and electron density , relationship of strength and the strongest bond covalent electronic pairs number , relationship of stability and configuration number as well as assembly key ability F, and relationship of plasticity and homogeneous deformation factor α, try to use EET to explain influence of vacancy defects on the material physical properties and mechanical properties.
The current reduction, manifest as resistance increased on the physical properties.

Introduction The prediction of the mechanical properties of composite materials can improve the testing efficiency of the mechanical properties of composite materials, which is of great significance to the testing of the mechanical properties of composite materials.
The mechanical properties of the materials refer to the macroscopic mechanical properties of materials at the room temperature or under the static load.
The prediction model of the mechanical properties of composite materials can be established through considering the composition of materials, the manufacturing processes, the environment and other relevant factors.
The prediction model of the mechanical properties of composite materials has played a guiding role in the testing of the mechanical properties of the composite materials.
In short, the mechanical property of the composite materials is the nonlinear model that is affected by various relevant factors.

Mechanical Properties of Chemical Etched Biomedical NiTi Alloy Wires Zhen LI 1, a , Zhaoqing LI 1, b , Lida HOU 1, c , Li LI1, d,* 1 Center for Biomaterials and Engineering, Harbin Engineering University, China a lz_heu@hrbeu.edu.cn, b lizhaoqing@hrbeu.edu.cn, c 1985houlida@163.com, d lili_heu@hrbeu.edu.cn Keywords: NiTi alloy, chemical etching, micro-hardness, mechanical property Abstract.
The surface morphology, the etching products and the mechanical properties of the fine NiTi wires after the chemical etching process are investigated in the paper.
Mechanical properties of NiTi alloy fine wires after etching were studied by means of tensile tests.
Then, measured hardness values are considered hardly affected by superelasiticity[3].
The main influential factors for mechanical properties are the local stress concentration caused by surface corrosion pits.

Its properties have been better than 60Si2CrVA steel.The difference between of them is using controlled rolling process for D701 steel.The affect of hot treatment process was studied by orthogonal test on D701 steel property in the article.
The mechanical property was tested by hydraulic universal test machine.
Table 2.Four factor and three level test Factor\level 1 2 3 quench temperature ( °C ) 840 870 900 quench time ( min ) 20 30 40 temper temperature ( °C ) 390 420 450 temper time ( min ) 60 75 90 Results Mechanical property.
Fig.5 Fracture shape on D701 steel by tensile test (a)held 30 min at 900°C oil quench and held 75 min at 390°C water cooled; (b)held 40 min at 870°C oil quench and held 75 min at 420°C water cooled; (c)held 20 min at 840°C oil quench and held 75 min at 450°C water cooled; a b c a b c 5μ 5μ 5μ 5μ 5μ Discussions According to the orthogonal test of heat treatment process, the most important influencing factor to the mechanical properties of high performance alloy spring steel D701 is the tempering temperature, whose datak element is highest among the four factors.
(2) The tempering temperature is the most important influencing factor to the mechanical properties of high performance alloy spring steel D701.

Metallographic Examination of Forming Improved Mechanical Properties via Surfacing of Steel HARDOX 450 with Flux Cored Wire S.
Phase composition, defect substructure, and mechanical and tribological properties of the steel Hardox 450 surfaced with С-V-Cr-Nb-W wire are analyzed relying on procedures of transmission diffraction microscopy, mechanical and tribological methods.
Mechanical properties of the deposited metal and steel are characterized according to the microhardness value (HVS-1000A) (indentation load 5 N).
Conclusion The metallographic tests of phase composition, defect substructure, mechanical and tribological properties of material deposited singly and iteratively on steel by С-V-Cr-Nb-W surfacing wire are carried out.
It has been found out that improvement of mechanical and tribological properties of the deposited layer is possible due to the developing multiphase submicro- and nanostructure.

Performance of post and core depends on a number of factors, and post-core materials are the most significant ones.
To design highly durable post has to take into account many factors.
Figure 3 Loading of the restorative system Sensitivity analyses In Fig. 6, sensitivity of the post material properties affecting the maximum EQV stress in the root and maximum deformation of the restorative system is presented.
(a) for =0.85 (b) for =0.8 (c) for =0.26 Figure 4 Response surface of the maximum EQV stress in root (a) for =0.85 (b) for =0.8 (c) for =0.26 Figure 5 Response surface of the maximum displacement of the restorative system Figure 6 Sensitivity of the post material properties affecting the mechanical response of the restorative system Conclusions In this paper, a 3-D finite element model was established for the restorative system with one-piece glass fiber post-and-core to investigate the effects of the post material properties on the mechanical response of the system.
Factors determining post selection-A literature review.

Microstructure and Mechanical Properties of the Wide-gap Region Brazed with Various Powder Mixing Ratios of Additive to Filler Metal Powders Y.
It was found that the (Cr, W)2B and pores in the brazed region are important microstructural factors affecting the mechanical properties of the wide-gap brazed region.
Although many researchers [6-8] have reported on the microstructural characterization and mechanical properties of the wide-gap brazed regions, little is known about the relations between the microstructures and final mechanical properties in the wide-gap region brazed with Ni-based superalloy additive powder and filler metal powder because of its complex chemical composition.
In order to evaluate the mechanical properties of the wide-gap brazed region, tensile tests were carried out at room temperature and 900ºC.
It is believed that the (Cr, W)2B and pores in the brazed region were important microstructural factors affecting the mechanical properties of the wide-gap brazed region.

Major microstructural factors controlling properties of magnesium alloys after semisolid processing are discussed.
While some factors cause an improvement in product properties, others have clearly negative contributiuon.
As seen in Fig. 2, in addition to the primary solid and transformed liquid, an interface between them is an additional factor affecting properties.
Elements of thixotropic microstructure affecting mechanical properties (a) and complex nature of transformed liquid portion with different phase morphologies, residual shrinkage and porosity, AZ91 alloy (b) It is generally accepted that the globule origin is traced to the alloy grain in the solid state [8].
Evolution of grain size and solid fraction during heating of the Mg-8%Al-2%Zn alloy deformed by extrusion [8] Role of alloy chemistry and post processing treatments For a given chemical composition of a magnesium alloy, the technique of component manufacture affects the microstructural factors, which control properties.

MECHANICAL PROPERTIES ACCORDING TO HEAT TREATMENT FOR GAS TURBINE BLADE MATERIAL Moon Young Kim 1,a, Sung Ho Yang 1,b and Kuk Hyun Song1,c 1 Department of Gas Turbine Technology Service Center, KPS, 247, Kyungseo-dong, Seo-gu, Incheon 404-718, South Korea a mykim@kps.co.kr, bshyang@kps.co.kr, cskhyun7@nate.com Keywords: GTD111DS (directional solidification), Gas turbine blade, γ´, HIP (hot isostatic pressing), Mechanical properties.
In the latter steps, we observed changes of γ´ phase affected in material properties, and microhardness test was carried out to evaluate mechanical properties according to changes of γ´ fraction and shape.
And also mechanical properties changes such as micro-hardness related to γ´ phase.
Therefore, this work was tried to help to understand basically the mechanism on HIP treatment by microstructure and mechanical properties evolution. 2.
And also it was selected average micro-hardness by Rockwell tester recording data 5 times each to evaluate mechanical properties. 3.

Four factors investigated were amount of UVabsorber, antioxidant, carbon black, and flame retardant.
The amount of UV-absorber and other additives seemed to exhibit significant interaction effect on mechanical properties.
The collected mechanical properties data were graphically and statistically analyzed by Analysis of Variance (ANOVA).
The final regression models for predicting all the mechanical properties are summarized in Table 2.
In addition, it was found that UV exposure could actually improve short-term mechanical properties due to postcuring phenomenon.