There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

비만아 부모의 돌봄 경험: q 방법론

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

A review of selective laser melting of aluminum alloys: Processing, microstructure, property and developing trends

Friction stir welding (FSW) is a widely used solid state joining process for soft materials such as aluminium alloys because it avoids many of the common problems of fusion welding. Commercial feasibility of the FSW process for harder alloys such as steels and titanium alloys awaits the development of cost effective and durable tools which lead to structurally sound welds consistently. Material selection and design profoundly affect the performance of tools, weld quality and cost. Here we review and critically examine several important aspects of FSW tools such as tool material selection, geometry and load bearing ability, mechanisms of tool degradation and process economics.

Review: friction stir welding tools

/pdf/effect-of-multi-pass-friction-stir-processing-on-the-m9a94az9lf.pdf

Effect of multi-pass friction stir processing on the microstructure and mechanical properties of dual phase steel

’Microstructural Characterization and Mechanical Properties of St37/St52 Plates Joined by Friction Stir Welding

Tel Ark Eklemeli İmalat: Son Gelişmeler ve Değerlendirmeler

This study was undertaken to identify the microstructural characteristics of the intermetallic phases formed at the interface during the bonding process and determine the mechanical properties of Ti-Al dissimilar diffusion bonded joints, namely strength and fracture toughness. Furthermore, the effect of the intermetallic phases on the strength and fracture toughness of the joint was also determined. The effect of strength mis-match between Ti and Al on the fracture process will also be discussed. This investigation is the first phase of a larger project on the characterization of the intermetallics formed and their influence on strength and fracture toughness of the joints between TiAl-TiAl. A series of diffusion bonds of 25mm {times} 25 mm thick Ti bars were produced using aluminum foils of different thicknesses as interlayer. The bonded joints were tested to determine the fracture toughness properties of the interface formed and the effect of intermetallic phase formation on the fracture toughness was evaluated. Four-point bend specimens containing a crack introduced into the interface during the bonding process were tested to determine the diffusion-bonded interface fracture toughness. Tensile tests of the joints were also conducted to determine their strengths. The bonding conditions required to obtain a sound joint between Timore » and Al were also evaluated.« less

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Papers

Effect of multi-pass friction stir processing on the microstructure and mechanical properties of dual phase steel

’Microstructural Characterization and Mechanical Properties of St37/St52 Plates Joined by Friction Stir Welding

Tel Ark Eklemeli İmalat: Son Gelişmeler ve Değerlendirmeler

Microstructure and fracture toughness aspects of diffusion bonded interface between Ti and Al

Gaz Tungsten Ark Kaynaklı 9Ni Kriyojenik Çelik Bağlantının İçyapı ve Mekanik Özelliklerinin Belirlenmesi