Severe Plastic Deformation Induced in Al, Al-Si, Ag and Cu by Hydrostatic Extrusion

2014 ◽  
Vol 59 (1) ◽  
pp. 59-64 ◽  
Author(s):  
M. Kulczyk ◽  
S. Przybysz ◽  
J. Skiba ◽  
W. Pachla
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Hydrostatic Extrusion ◽  
Adiabatic Heating ◽  
High Quality ◽  
Aluminum Silicon Alloy ◽  
Quality Surface ◽  
High Quality Surface

Abstract The study was concerned with the effect of severe deformation induced in one pass, by hydrostatic extrusion on the properties of fine aluminum, aluminum-silicon alloy, copper and silver wires. The influence of adiabatic heating which takes place during deformation on the mechanical properties and microstructure of the wires was examined. The quality of the surface of the wires was estimated. It has been demonstrated that fine aluminum and silver wires processed by hydrostatic extrusion have very good mechanical properties and a high-quality surface.

Influence of Severe Plastic Deformation on the PLC Effect and Mechanical Properties in Al 5XXX Alloy

2006 ◽  
Vol 114 ◽  
pp. 171-176 ◽  
Author(s):  
Joanna Zdunek ◽  
Pawel Widlicki ◽  
Halina Garbacz ◽  
Jaroslaw Mizera ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
True Strain ◽  
Tensile Tests ◽  
Size Reduction ◽  
Hydrostatic Extrusion ◽  
Stress Strain ◽  
Chatelier Effect

In this work, Al-Mg-Mn-Si alloy (5483) in the as-received and severe plastically deformed states was used. Plastic deformation was carried out by hydrostatic extrusion, and three different true strain values were applied 1.4, 2.8 and 3.8. All specimens were subjected to tensile tests and microhardness measurements. The investigated material revealed an instability during plastic deformation in the form of serration on the stress-strain curves, the so called Portevin-Le Chatelier effect It was shown that grain size reduction effected the character of the instability.

Development and Research of the Billet Forging Technology in the Newly Designed Step-Wedge Dies

2019 ◽  
Vol 946 ◽  
pp. 750-754
Author(s):  
A.O. Tolkushkin ◽  
Sergey N. Lezhnev ◽  
Abdrakhman B. Naizabekov
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Product Quality ◽  
Microstructure Evolution ◽  
Deformation Process ◽  
Improve Product Quality ◽  
High Quality ◽  
Research Results ◽  
Forging Die

One of the main ways to improve product quality, obtained by forging, is implementing shear and alternating deformation (severe plastic deformation) during deformation process, which allows manufacturing products with required mechanical properties and less forging reduction. In practice, it is possible to implement shear and alternating deformation by improving the design of the ingots or the billets, forging tools, heating modes and forging method. In this paper newly designed forging die, which allows implementation of shear and alternating deformation without sufficient changes of the billet sizes, is proposed. By the research results of the new forging technology influence in the proposed tools on the microstructure evolution, it was found, that the use of the newly designed step-wedge dies has more potential for manufacturing high-quality forgings with required level of mechanical properties.

scholarly journals Influence of the technical condition of the 011-1-02N Remdetal installation on the quality of the coatings formed

2021 ◽  
pp. 42-44
Author(s):  
A.I. Fomin ◽  
◽  
P.V. Senin ◽  
V.V. Vlaskin ◽  
I.A. Baranov ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electrical Resistance ◽  
Technical Condition ◽  
Resistance Welding ◽  
High Quality ◽  
Quality Surface ◽  
High Quality Surface

The main modules of the 011-1-02N Remdetal installation for steel tape electrical resistance welding are described. The plant malfunctions arising during operation are identified. The analysis of the influence of these faults on the formation of a high-quality surface layer during the restoration of parts is performed. Recommendations on the maintenance operations of the modules under consideration are given.

scholarly journals 3D Printing of Aramid Nanofiber Composites by Stereolithography

2021 ◽  
Author(s):  
Sachini Perera ◽  
Alejandra Durand-Silva ◽  
Ashele Remy ◽  
Shashini Diwakara ◽  
Ronald Smaldone
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Exchange Process ◽  
Polymeric Materials ◽  
Solvent Exchange ◽  
High Quality ◽  
Filler Dispersion ◽  
Printing Method ◽  
Quality Surface ◽  
High Quality Surface

Vat photopolymerization is a versatile 3D printing method that produces parts using polymeric materials with uniform mechanical properties, high quality surface finish and high-resolution features. However, it is challenging to make composite materials with vat photopolymerization mainly due to the imperfect filler dispersion in the photo resin. Herein, we describe a methodology to incorporate aramid nanofibers (ANFs) into a 3D printable photoresin as a dispersion, followed by a solvent exchange process that limits anisotropic shrinkage and cracking of the printed polymer. By incorporating 0.60 wt.% of ANFs, both the tensile strength and toughness increased by 264 % and 219 % respectively, while the Young’s modulus had a 406 % increase compared to the control photoresin.

Research and Implementation on the Quality Controlling Method of NURBS Curve

2011 ◽  
Vol 121-126 ◽  
pp. 4269-4273
Author(s):  
Ping Ai ◽  
Bo Zhao
Keyword(s):  
Practical Experience ◽  
High Quality ◽  
Nurbs Curve ◽  
The Core ◽  
Nurbs Curves ◽  
Depth Study ◽  
Quality Surface ◽  
High Quality Surface ◽  
Modification Of The Surface

In CAID software based on NURBS technology, the quality of curve directly affects the quality of surface, and the post-editing and modification of the surface, so good curve is the core and key to build high-quality surface. In this paper, combining the basic theory of NURBS curves with practical experience, we conduct an in-depth study in the method of controlling the quality of the NURBS curves, and propose an implementation to improve the quality of the NURBS curves.

The Influence of Hydrostatic Extrusion on the Microstructure of 6082 Aluminium Alloy

2006 ◽  
Vol 114 ◽  
pp. 145-150 ◽  
Author(s):  
Pawel Widlicki ◽  
Halina Garbacz ◽  
Małgorzata Lewandowska ◽  
Wacław Pachla ◽  
Mariusz Kulczyk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Tensile Strength ◽  
Severe Plastic Deformation ◽  
Light Microscopy ◽  
Aluminium Alloy ◽  
Extrusion Process ◽  
Hydrostatic Extrusion ◽  
Fine Grained

Hydrostatic extrusion can be viewed as one of the methods of Severe Plastic Deformation, SPD, for the fabrication of ultra-fine grained alloys which causes a significant increase in the mechanical properties such as tensile strength and hardness. In the present study the microstructure of 6082 aluminium alloy after hydrostatic extrusion was investigated. Hydroextrusion was performed in three steps with accumulated true strains of 1.34, 2.73 and 3.74 respectively. Microstructural observations were carried out using SEM, TEM and light microscopy. Grain and inclusion sizes, shapes and distribution were investigated in the HE processed samples. The study has shown that the hydrostatic extrusion process results in a profound refinement of both the grain size and the inclusions in 6082 aluminium alloy.

scholarly journals Structural State Effect on Mechanical Properties and Acoustic Emission of High-Purity Titanium at Different Types of Deformation

2019 ◽  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Purity ◽  
Acoustic Waves ◽  
Hydrostatic Extrusion ◽  
Dislocation Slip ◽  
Petch Relation ◽  
Strength Differential ◽  
Purity Titanium

The results on investigations of mechanical properties of high-purity titanium with grains ranging from tens of nanometers up to a few micrometers subjected to uniaxial tension, compression and microindenting are presented. Different structural states in high-purity titanium were formed by severe plastic deformation according to the scheme «upsetting – extrusion – drawing» in combination with annealing at temperatures of 250–550° C and quasi-hydrostatic extrusion at room and liquid nitrogen temperatures. The values of yield strengths and microhardness for samples of high-purity titanium with grains of different sizes are determined. It was shown that the combination of severe plastic deformation with cryogenic quasi-hydrostatic extrusion allowed to create high-purity nanocrystalline titanium with high mechanical properties. The obtained experimental data were analyzed for the implementation of the Hall-Petch relation and discrepancy between the values of yield strengths in tension and compression (strength differential or S-D effect). Satisfactory fulfillment of the Hall-Petch relation for high-purity titanium in the whole range of the studied grain size values was shown and a noticeable difference in the yield values for compression and tension was found. The values of the coefficients in the Hall-Petch equation for deformation by tension, compression and microindenting were determined. These coefficients are noticeably lower than the corresponding values for the industrial grades of titanium, i.e. in high-purity titanium, the grain boundaries are weaker barriers for moving dislocations than in the industrial titanium, whose boundaries are enriched with impurities. The features of the acoustic waves emission during compression of samples in various structural states were studied. It was concluded that the deformation of titanium in all the investigated structural states was carried out by dislocation slip.

scholarly journals Microstructure and Texture of Hydrostatic Extrusion Deformed Ni Single Crystals and Polycrystal

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
D. Jakubowska ◽  
J. Zdunek ◽  
M. Kulczyk ◽  
J. Mizera ◽  
K. J. Kurzydłowski
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Single Crystal ◽  
Single Crystals ◽  
Relevant Literature ◽  
Hydrostatic Extrusion ◽  
Total Deformation ◽  
Polycrystalline Nickel ◽  
Before And After

The differences in the microstructure and texture of two Ni single crystals, with different initial orientations (100and110), and of polycrystalline nickel, before and after severe plastic deformation (SPD) produced by hydrostatic extrusion (HE), have been investigated. The crystals were deformed by a two-step HE process with a total deformation value ofε=1.2. The global texture, mechanical properties, and microstructure were examined after the deformation. In every investigated sample, the presence of111fibre texture was noted, while the starting orientation of a100Ni single crystal was preserved in 50% of the volume. The results obtained were compared with the relevant literature data.

The Influence of the Initial State on Microstructure and Mechanical Properties of Hydrostatically Extruded Titanium

2008 ◽  
Vol 140 ◽  
pp. 191-196 ◽  
Author(s):  
Krzysztof Topolski ◽  
Halina Garbacz ◽  
Wacław Pachla ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Extrusion Process ◽  
Hydrostatic Extrusion ◽  
Initial Condition ◽  
Optimum Conditions ◽  
Initial State ◽  
Intended Application ◽  
Extruded Product

Titanium was subjected to hydrostatic extrusion, a method of producing Severe Plastic Deformation (SPD). The experiments were aimed at refining the microstructure of the titanium in order to improve some of its mechanical properties. The effect of the initial state of titanium on the process of extrusion process and the final product was investigated. The results of these investigations are used to establish the optimum conditions for the hydrostatic extrusion process and more easily selecting the initial condition of the material according to the intended application of the extruded product.

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