Effect of Autoclave Processing Parameters used to Form Hybrid SIAL Parts on the Structure and Properties of Al-Li Alloy 1441 Sheets

The paper considers the main stages of developing hybrid composite materials similar to GLARE, such as SIAL, on the basis of alloy 1441 sheets. The technology of manufacturing aviation products via auto-clave forming of such materials includes additional episodes of heating the thermally processed alloy 1441 sheets that form part of the hybrid material structure. Studying the microstructure of the Al-Li alloy sheets, the number of emergent phases and their mechanical properties shows that there is no considerable variation to be found in the properties of the SIAL hybrid composite material as a result of the alteration taking place The work is performed as part of actualising a comprehensive field of research 6.2 "Laminate fracture-resistant, high-strength metal-polymer materials" ("Strategic areas of developing materials and material processing technology for the period up to 2030")

Research Status and Prospect of Friction Stir Processing Technology

Friction stir processing (FSP) is a novel solid-phase processing technique that is derived from friction stir welding (FSW). The microstructure of the base metal can be modified with the friction heat and stir function during processing. It can be used to fabricate surface composites and in situ composites by adding reinforced particles into the metal matrix via FSP. Friction stir processing can significantly improve the hardness, wear resistance, ductility, etc., while preventing defects caused by material melting. It is an ideal material processing technology and has good prospects in the field of superplastic materials and for the preparation of metal matrix composites. This paper reviews research developments into the principle, process, and applications of FSP technology as well as its future research directions and development prospects.

Flyer Thickness Effect in the Impact Welding of Aluminum to Steel

Impact welding is a material processing technology that enables metallurgical bonding in the solid state using a high-speed oblique collision. In this study, the effects of thickness of the flier and collision angle on weld interface morphology were investigated through the vaporizing foil actuator welding (VFAW) of AA1100-O to AISI 1018 Steel. The weld interfaces at various controlled conditions show wavelength increasing with the flier thickness and collision angle. The AA1100-O flier sheets ranged in thickness from 0.127 to 1.016 mm. The velocity of the fliers was directly measured by in situ photon Doppler velocimetry (PDV) and kept nearly constant at 670 m/s. The collision angles were controlled by a customized steel target with a set of various collision angles ranging from 8 deg to 28 deg. A numerical solid mechanics model was optimized for mesh sizes and provided to confirm the wavelength variation. Temperature estimates from the model were also performed to predict local melting and its complex spatial distribution near the weld interface and to compare that prediction to experiments.

Mechanism of natural acid-formation of shungite rocks and its role in industrial introduction

For the first time the mechanism of natural acid-formation of shungite rocks in preliminary grinding processes is studied and substantiated explicitly. Acid-formation of shungite headings in the technical processing is the major drawback constraining broad application of finely-dispersed shungite rocks. The application sphere of neutralized shungite products will be essentially broaden and high-technology branches of industrial production will get qualitative product with unique properties that shungite rocks possess. The book would be interesting for specialists in the sphere of mineral raw material processing technology, geochemists, as well as it can be useful for PhD students, researches and those working in the industry connected with matters of rational management of natural resources.

Selection and Comparison of Power Cable Accessories

This paper the properties of heat-shrink tubing, cold-shrink tubing and prefabricated type cable accessories are studied. And based on that, we make a contract with the composition of the material, processing technology and respective advantages. We found that heat-shrink tubing is the most widely use in the electric power system, which has the advantage of low price, simple machining technology and wide source of raw materials. The major characteristic of cold-shrink tubing is easy to install without heating, which is superior to heat-shrink tubing. In addition, excellent physical properties and high contraction rate are also the reflection of its advantages. The prefabricated type cable accessories, as the latest products, have good use foreground because of the resistance to interference and the convenience.

A Single Students' Experience for Visualizing Completely a Semester Subject

Manufacturing Engineering Processes Knowledge Area has developed an innovative teaching experience in order to give, only in one session, a complete view of a basic subject, Manufacturing Engineering. This experience has been developed on the basis of making a cube constructed in card by groups of students. Starting from this, the different steps of a manufacturing process have been identified, as well as the necessity of establishing a quality control for any of them. Moreover, the different material processing technology types have been distinguished, the concept of process performance has been introduced and the different possibilities for sequential and/or parallel processing have been analyzed. On the basis of this, the students have built the topics program of the subject, justifying its competences distribution. In the same way, the students have defined the related basic concepts. At the end of the course, a questionnaire containing the basic cognitive concepts was answered by them, 100% successfully.