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Aging Precipitation Behavior of Cu-Ag-Cr Alloy LEI Jing-guo*1,2 , LIU Ping1 , TIAN Bao-hong 1 , ZHI Xiao2, and JING Xiao-tian2 1 School of Materials Science, Henan University of Science & Technology, Luoyang 471003, China 2 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China *ljg1000@163.com Keywords: cu-ag-cr alloy; coherency; semi-coherency Abstract.
Introduction The higher properties for contact wire materials are required to satisfy the rapid development of high-speed electrical railway [1,2].The ideal contact wire materials should reach the electrical conductivity which is 80%IACS, tensile strength of 550MPa.
References [1] S.G.Jia, P.Liu, F.Z.Ren, et al., Metals and materials international. 11, (2005)71
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Both compounds are optically active materials.
In making pentanary alloy semiconducting materials by changing the composition of materials, the energy band gaps and lattice parameters can also be varied independently.
El Haj Hassan: First-principles calculations of the structural, electronic and optical properties of In1-xBxAsyP1-y quaternary alloys lattice matched to InP and BeS, Materials Science in Semiconductor Processing 36, (2015), 27-35
[5] Sikander Azam, Saleem Ayaz Khan, Souraya Goumri-Said in: Modified Becke–Johnson (mBJ) exchange potential investigations of the optoelectronic structure of the quaternary diamond-like semiconductors Li2CdGeS4 and Li2CdSnS4, Materials Science in Semiconductor Processing 39, (2015), 606-613
Journal of Crystal Growth, 310, (15), 3453-3458.

In the area of application of these materials on gears, some authors [1, 2, 3 and 4] performed various experiments which were mainly focused on materials that are normally used for the production of gearing.
One of these materials is maraging steel too.
We used the material in an experiment for comparing to standard materials used for the manufacture of gears [4].
Surface roughness values for different coatings Basic material TiCN II DLC CrN Cr/CrN sandwich Duplex CrN Ra Rz Ra Rz Ra Rz Ra Rz Ra Rz 18Ni (250) Maraging Steel 0.72 6.13 0.50 9.46 0.42 4.27 0.48 4.56 0.65 6.89 The microstructure or the detection of elements present in individual thin layers on the substrate made of 18Ni (250) Maraging Steel and layer thickness measurements were performed using the JEOL JSM7600F high-resolution scanning electron microscope at the Institute of Materials Science of the Faculty of Materials Science and Technology in Trnava.
Rusnák: Ecological oils applied in sliding journals.

Tekkaya (2013) Grain size evolution simulation in aluminum alloys AA6082 and AA7020 during hot forward extrusion process Materials Science and Technology vol. 29-1, pp. 100-110
Maier A new method for determining dynamic grain structure evolution during hot aluminum extrusion, Journal of Materials Processing Technology Volume 212, Issue 1, January 2012, Pages 323–330
Materials Science and Engineering A 351 (1-2) pp. 282-292
Material Science and Engineering A280, pp 1-7
International Journal of Surface Science and Engineering 4 (1), pp. 27-41.

The material is deformed height- width- and lengthwise.
Karimi Taheri: Materials Letters Vol. 60 (2006), p. 3265
Glowacki: Journal of Materials Processing Technology Vol. 62 (1996), p. 229
Inakov: Journal of Materials Processing Technology Vol. 142 (2003), p. 355
Russian Academy of Science.

Journal of marine science and technology Vol. 7 (2002), P.43-56
Journal of Electronic Packaging Vol.125 (2003), P.120-125
An energy-based uniaxial fatigue life prediction method for commonly used gas turbine engine materials.
Fatigue-life prediction method based on small-crack theory in an engine material.
Journal of pressure vessel technology Vol.135 (2013), P.021703-1-10

The backup materials can be low melting point metals and alloys.
After separating the coating from its master mould and remove the backup materials, a part with thin-wall can be got.
Because of low temperature, the materials to manufacturing master moulds can be chosen in wide range.
Those easy machining materials such as copper and aluminum can be chosen. 4.
Many kinds of master mould materials such as 45 steel, stainless steel, copper and aluminum be chosen in experiments.

Von mises stress known as the maximum distortion energy criteria that often used to estimated the yield of ductile materials.
Failure will occur when the maximum value of von mises stress applied to the material is more than the strength of the material.
International Journal of Modern Engineering Research (IJMER), volume 3. issue 3 (2013), p.1666-1671
International Journal of Innovative Science and Modern Engineering (IJISME), volume 2, issue 6 (2014), p.1-5
Contemporary Engineering Sciences, (2009), 2(4): p.179 -190

Beijing: science press, 2006 in Chinese ,[] BI BaoDe.
Journal of Beijing International Studies University, 2007, 5:67-73. ,[] Kang Xiaomei,Qin Anchen,Jia Zhe,Yang Huijuan,Peng Yurong .
Journal of Arid Land Resources and Environment,2009,23（2）：41-46 in Chinese. ];evaluation of landscape ecology index [[] Laender,Frederik De Karel A.C.
Journal of Natural Resources,2010,25（7）1088-1096 in Chinese. ];ecological effect measured value or quantitative evaluation of ecological effect index based on measured value [[] AO Kun-quan; LIU Xiu-hua; YANG Chao-xian ..
Journal of Southwest Agricultural University(Social Sciences Edition) ,2007,5(4):1-5. ]; Environmental impact assessment; Ecological efficiency evaluation; model constructing[[] Laender,Frederik De Karel A.C.

Therefore, it is necessary to find solutions by means of carrying out complex process and materials science experiments.
Materials and investigation procedure Steel N-A-XTRA-70 was taken as an object for investigation since it is a typical representative of class of high-strength steels.
Laser welding was carried out without application of filler materials and hybrid one using electrode wire Union NiMoCr (Ø 1.0 mm).
Berdnikova, The structure features of welded joints of high strength steel, formed in a laser welding, In Proceeding: Laser Technologies in Welding and Materials Processing.
Berdnikova, Structure and properties of laser-welded joints from high-strength steels, Applied Mechanics and Materials. 682 (2014) 240-245