Vol 1, No 1 (2018)

Table of Contents

Original Research Articles

by Nushaba Nubarak Gadzhieva
11 Views, 16 PDF Downloads

Reflection IR spectroscopy, atomic force microscopy (AGM), and electrophysical measurements were used to investigate the formation of surface oxide nanostructures during the radiation oxidation of metallic aluminum in contact with water. It is revealed that the radiation modification of the surface relief is accompanied by the formation of oxide nanolayers, the defectiveness of which is determined by the irradiation time. It is shown that the formation of oxide nanolayers in the region of absorbed dose (0.5-120 kGy) occurs in three stages, which is accompanied by a decrease in electrical conductivity by 5 orders and an increase in the thickness of the oxide layer by an order of magnitude. The role of surface intermediate-active particles in the formation of oxide nanostructures is considered.

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Original Research Articles

by А.F. Salenko, V.Т. Shchetinin, G.V. Gabuzian, V.А. Nikitin, S.А. Klymenko, А.М. Potapov, Lj. Tanovic
31 Views, 30 PDF Downloads

Background: Modern composite materials have a number of advantages in comparison with the traditionally used ones and allow implementing new methods of processing, which makes the finished product cheaper and makes its use more efficient.

Objective: In order to improving the surface quality and productivity taken by A functional approach. 

Method: A functional approach to the development of cutting technologies for Carbide and Super Hard Multilayered Composites is considered. It allows, by alternating the effects of different nature, to obtain qualitative edges, to lower the residual stresses in the surface layers, and to achieve a high surface quality. The essence of the approach is that the method of impact is determined on the basis of a morphological search of options for the execution of individual surface elements, each of which, combined into a set, uniquely forms the function of the finished product. The cutting is determined by a rational sequence of execution of technological transitions, provided that each harmful intermediate function at the finish stage turns into neutral or complements the required useful function.

Results: Examples of figured cutting of plates from polycrystalline diamond-containing materials are given, the results of obtaining qualitative edges are shown.

Conclusion: Thanks to the proposed technology based on the use of a functionally oriented approach, the functions of the tool for cutting are divided between the tool itself and the product part. As a result, the processing speed increases more than 3 times, and a high cut quality is achieved.

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Original Research Articles

by Hasan Akhyar
20 Views, 14 PDF Downloads

This experiment investigated the cooling curve behavior, hardness and microstructure of two aluminum alloys produced by casting process. There are Al-1.37Zn-1.19Si and Al-1.66Si-1.35Zn derived from melting and alloying a pure aluminum with ADC12 (Al-Si) ingot. Cooling curve recorded from both those two alloys with pouring temperature at 710 oC and the mold temperature kept constant at 220 oC. The result shows, a freezing range of Al-1.37Zn-1.19Si alloy is 643–348 oC and Al-1.66Si-1.35Zn alloy is 621–401 oC. Then cooling rate obtained for Al-1.37Zn-1.19Si is 55.56 oC/S, and Al-1.66Si-1.35Zn is 30.09 oC/S. TThe higher hardness is 40.42 BHN at Al 1.66 Si-1.35Zn, while the lower value is 34.62 BHN on Al-1,37Zn-1,19Si alloy. The hardness value found higher when cooling rate is shorted. The number of silicon present on microstructure is highest in Al-1.37Zn-1.19Si alloy but the hardness value decreases. This is caused by the distribution of the silicon content in the alloy is irregular. It was found that the solidification rate had an effect on hardness, where the freezing rate obtained a high hardness value.

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Original Research Articles

by Huang Huanhai
6 Views, 8 PDF Downloads

The potential crisis of energy and the deterioration of ecological environment make the world's cumbersome
development of renewable energy including new energy, including solar energy. Traditional energy in the coal, oil and
natural gas are evolved from ancient fossils, it is collectively referred to as fossil fuels. As the world's energy needs
continue to increase, fossil fuels will also be depleted, it is necessary to fi nd a new energy to replace the traditional
energy. Solar energy is a clean renewable energy with mineral energy incomparable superiority. Modern society should
be a conservation-oriented society, and social life should also be a life-saving energy. At the same time, Premier Wen
Jiabao also proposed on June 30, 2005 and stressed the need to speed up the construction of a conservation-oriented
society. And solar energy as an inexhaustible new environmentally friendly energy has become the world's energy
research work in the world an important issue. Is the world in the economic situation to take a simpler, economical,
environmentally friendly and reliable building heating and heating energy-saving measures. This paper summarizes the
current global energy status, indicating the importance of solar power and prospects. Details of the various solar power
generation methods and their advantages, and made a comparison of this power generation parameters. At the same
time pointed out that the diffi culties faced by solar power and solutions, as well as China's solar power of the favorable
conditions and diffi culties. The future of China's solar energy made a prospect.

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Original Research Articles

by Zhong Xiuhua
3 Views, 13 PDF Downloads

Polyethylene has become the most important polyolefi n plastic with excellent mechanical properties, processing
properties and chemical resistance. It is used in the production of film, packaging and pipe. However, the nonpolar
property and low rigidity of polyethylene limits its application in certain fi elds. The new progress of chemical
modifi cation, physical modifi cation and modifi cation of polyethylene were reviewed. Chemical modifi cation includes
graft modification, copolymerization modification, crosslinking modification, chlorination, chlorosulfonation
modification and plasma modification. There are different methods of polyethylene production which include high
pressure polyethylene, medium pressure polyethylene and low pressure polyethylene. All three methods have their own
benefi ts and shortcomings which coexist in the industry.

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Original Research Articles

by Joseba Mendiguren, Biotza Zubia, Julen Agirre, Lander Galdos, Eneko SaenzdeArgandona
16 Views, 9 PDF Downloads

Material formability has become one of the main problems, together with the springback, when stamping high added-value components for the automotive industry. The pursuit of weight reduction has led to higher strength alloys which show a lower formability. Among the different formability criteria (e.g. necking, edge strain, fracture and radius cracks) the edge strain is starting to be a critical aspect on the process planning stage. In order to characterise this criteria, the hole expansion ratio (HER) is conducted under the ISO 16630 standard. In the last years, multiple authors have analysed the HER of different alloys and its dependency on different process variables i.e. cutting method, test speed, material strength. However, the influence of the springback phenomenon on the test result has not been previously analysed. In this work, the influence of the springback on the HER values has been analysed for a mild steel DX54D and a third generation steel Fortiform1050 with a novel measuring technique. From the obtained results, it can be stated that the springback has a critical influence on the characterised HER value, mainly for the third generation steel, leading to differences of about 40% on the HER limits.

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