scholarly journals On the Direct Extrusion of Magnesium Wires from Mg-Al-Zn Series Alloys

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1208
Author(s):  
Maria Nienaber ◽  
Sangbong Yi ◽  
Karl Ulrich Kainer ◽  
Dietmar Letzig ◽  
Jan Bohlen
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Wire Drawing ◽  
Filler Materials ◽  
Drawing Process ◽  
Suture Materials ◽  
Direct Extrusion ◽  
Al Content ◽  
One Step ◽  
Typical Process

Wires of magnesium alloys possess a high potential, e.g., as filler materials, for joining applications but also for biodegradable applications, such as suture materials. While the typical process of producing wires is based on a wire drawing process, direct extrusion by using adjusted dies to deal with high degrees of deformation allows a one-step manufacturing of wires to some extent. In this work, the extrusion of wires with a thickness of 1 mm and even lower is shown feasible for pure magnesium and three Al-containing magnesium alloys (AZ31, AZ80, AZ91). The surface quality and the mechanical properties are improved with increasing Al content. It is shown that, despite the large difference in the degrees of deformation, the properties and their development are similar to those of extruded round bars. Wrapping tests were carried out as an exemplary more complex forming procedure, and the behavior is correlated to the microstructure and texture of the extruded wires.

Influence of Strain Path Changes on Microstructure Inhomogeneity and Mechanical Behavior of Wire Drawing Products

2010 ◽  
Vol 654-656 ◽  
pp. 314-317 ◽  
Author(s):  
K. Muszka ◽  
M. Wielgus ◽  
J. Majta ◽  
K. Doniec ◽  
Monika Stefanska-Kadziela
Keyword(s):  
Mechanical Properties ◽  
Strain Path ◽  
Low Carbon Steel ◽  
Wire Drawing ◽  
Drawing Process ◽  
Low Carbon ◽  
Forming Process ◽  
Steel Wires ◽  
Diameter Reduction ◽  
Strength And Ductility

Cold drawn low carbon steel wires are widely used in several engineering applications where a proper combination of strength and ductility is of the paramount importance. In the present paper, the multi-pass angular accumulative drawing (AAD) is proposed as a new forming process where the high strain accumulation is used as a way to achieve much higher microstructure refinement level compared to the conventional wire drawing process. This process is characterized by a complex strain path history, being an effect of wire diameter reduction, bending, tension and torsion, what directly affects the microstructure changes in the final product. This process also evolves high inhomogeneity of microstructure, that if properly controlled, can lead to further properties improvement - what can be especially beneficial for alloys that are not characterized by complex compositions. In the present paper, special emphasis is given on the inhomogeneity of both deformation and microstructure and resulted mechanical properties. After drawing and annealing (at 500oC) mechanical properties measurements and microstructure analysis on the longitudinal sections of the wires were performed to assess the differences existing with respect to the conventional wire drawing process.

scholarly journals In Situ Wire Drawing of Phosphate Glass in Polymer Matrices for Material Extrusion 3D Printing

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
J. Gilberto Siqueiros ◽  
David A. Roberson
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Phosphate Glass ◽  
Acrylonitrile Butadiene Styrene ◽  
Wire Drawing ◽  
Thermoplastic Composites ◽  
Filler Materials ◽  
Material System ◽  
Thermoplastic Resin ◽  
Material Extrusion

A strategy to increase the amount of materials available for additive manufacturing platforms such as material extrusion 3D printing (ME3DP) is the creation of printable thermoplastic composites. Potential limiters to the incorporation of filler materials into a thermoplastic resin include agglomeration of the filler materials, which can compromise the mechanical properties of the material system and a static morphology of the filler material. A potential solution to these issues is the use of filler materials with low glass transition temperatures allowing for a change in morphology during the extrusion process. Here, we successfully demonstrate the drawing of phosphate glass particles into a wire-like morphology within two polymeric systems: (1) a rubberized acrylonitrile butadiene styrene (ABS) blend and (2) polylactic acid (PLA). After applying a normalization process to account for the effect of air gap within the 3D printed test specimens, an enhancement in the mechanical properties was demonstrated where an increase in strength was as high as 21% over baseline specimens. Scanning electron microanalysis was used to characterize the fracture surface and wire drawing efficacy. Factors affecting the ability to achieve wire drawing such as polymer viscosity and print temperature are also highlighted.

Numerical and Experimental Analysis of Wire Drawing for Hardly Deformable Biocompatible Magnesium Alloys / Numeryczna I Doswiadczalna Analiza Ciagnienia Drutu Z Trudno Odkształcalnych Biozgodnych Stopów Magnezu

2013 ◽  
Vol 58 (1) ◽  
pp. 55-62 ◽  
Author(s):  
A. Milenin ◽  
P. Kustra
Keyword(s):  
Yield Stress ◽  
Magnesium Alloys ◽  
Experimental Analysis ◽  
Wire Drawing ◽  
Drawing Process ◽  
Thin Wire ◽  
Technological Parameters ◽  
Fem Model ◽  
Experimental Part ◽  
The Relationship

In the present paper the drawing processes of thin wire of biocompatible magnesium alloys in heated die was investigated. Due to the hexagonal close packet structure magnesium alloys have low plasticity. In order to design the technological parameters the FEM model of wire drawing process in heated die and models of yield stress and ductility were developed. The relationship between technological parameters of drawing and fracture parameters was obtained based on developed models. The maps of possible elongation for MgCa0.8 and Ax30 magnesium alloys were developed using simulations. The draft schedule for final wire diameter 0.1 mm was design assisted with FEM model in experimental part of work. Based on this draft plan the drawing process from initial diameter 1.0 mm to final diameter 0.1 mm in heated die was performed in designed by author’s device.

The Physical and Numerical Mesoscale Modeling of Cold Wire Drawing Process of Hardly Deformable Biocompatible Magnesium Alloys / Fizyczne I Numeryczne Modelowanie W Mezo Skali Procesu Ciągnienia Na Zimno Trudno Odkształcalnych Stopów Magnezu O Podwyższonej Biozgodności

2012 ◽  
Vol 57 (4) ◽  
pp. 1117-1126 ◽  
Author(s):  
A. Milenin ◽  
P. Kustra ◽  
D. Byrska-Wójcik
Keyword(s):  
Magnesium Alloys ◽  
Intergranular Fracture ◽  
Mesoscale Model ◽  
Fracture Initiation ◽  
Wire Drawing ◽  
Point Of View ◽  
Drawing Process ◽  
In Situ Tests ◽  
Material State

The problem of determination of the cold low diameter wire (diameter less than 0.1mm) drawing process parameters for hardly deformable biocompatible magnesium alloys by using the mathematical mesoscale model is described in the paper. The originality of the considered alloys (MgCa0.8, A×30) is the intergranular fracture mechanism associated with small strains (0.07-0.09). In previous authors works it was proven that the material state directly before appearance of the microcracks is in the optimal state from the point of view of the recovery of the plasticity by annealing. The forecasting of this material state in drawing process requires the development of the model of intergranular fracture initiation and using this model in two cases: - modeling of the in-situ tests, what allows calibrating and validating of the model; - modeling of the drawing process, what allows optimizing of the drawing parameters. A new model of the microcracks initiation in mesoscale using the boundary element method is proposed. The in-situ tests, which allowed observing the microstructure evolution during deformation, are used for the calibration and validation purpose. The model was implemented into self-developed FE software Drawing2d, which is dedicated to the drawing process. The results of mesoscale simulation were verified by the experimental drawing process of 0.07 mm diameter wires according to developed technology. It was shown by analysis of microstructure that the model allows forecasting the microcracks initiation during the wire drawing process.

Effects of Al and Zn on the Microstructure and Mechanical Properties of Magnesium Alloys

2010 ◽  
Vol 97-101 ◽  
pp. 801-804
Author(s):  
Jing Yuan Li ◽  
Xiao Lei Du
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Magnesium Alloys ◽  
High Strength ◽  
Al Content ◽  
Zn Content ◽  
Cast Magnesium Alloys ◽  
Cast Magnesium ◽  
Peak Value

Two groups of magnesium alloys with various Al and Zn components are studied in this paper. One group of alloys are constant Al content of about 6% and various Zn content from 0 to 3%, another group are constant Zn content of about 0.4% and various Al content from 0 to 6%. The microstructures and mechanical properties of these alloys are investigated in as-cast and homogenized at 380°C for 15h. The results show that the tensile strength increases but yield strength decreases after homogenizing treatment. It can also be found that the morphology of second phrase and the size of grain exert the more effect on the mechanical properties than Zn content does. The alloys with uniform, fine and non-dendrite microstructure exhibit both high strength and elongation regardless of Zn content. On the other hand, the tensile strength and yield strength elevate significantly as Al content increases, and the elongation has a peak value in Al content of about 1.90%. The results show that the as-cast magnesium alloys with Al content of 5.6~6.0% and Zn content of 0.6~1.0% exhibit the best comprehensive mechanical properties.

Effects of Microstructural Morphology on Mechanical Properties of Magnesium Alloys

2011 ◽  
Vol 686 ◽  
pp. 113-119
Author(s):  
Jing Yuan Li ◽  
Xiao Lei Du
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Cross Section ◽  
High Strength ◽  
Second Phase ◽  
Al Content ◽  
Uniform Microstructure ◽  
Zn Content ◽  
Microstructural Morphology ◽  
The Difference

The mechanical property of magnesium alloy depends on the alloy elements and microstructure strongly. The multiple dependency relations are studied by investigating magnesium alloys with different Al and Zn contents. The semi-continuous casting billets exhibit quite different microstructural morphologies between the centre and edge of the cross section. The centre shows fine and uniform microstructure while the edge is coarse and reticular. However the difference is almost eliminated when the billets were homogenized at 380°C for 15h. The generation mechanism of casting microstructure is also discussed in this paper. The results show that the morphology of second phase and the size of grain have greater effect on the mechanical properties than the element Zn. The alloys with uniform, fine and non-dendrite microstructure exhibit both high strength and elongation when Al content is about 6% and Zn content is various from 0 to 3%. In contrast, the strength increases and elongation decreases significantly as Al content increases from 0 to 6%.

Research of the Laboratory Wire Drawing Process of Zinc

2016 ◽  
Vol 682 ◽  
pp. 367-371 ◽  
Author(s):  
Michał Jabłoński ◽  
Tadeusz Knych ◽  
Andrzej Mamala ◽  
Beata Smyrak ◽  
Beata Ciejka
Keyword(s):  
Mechanical Properties ◽  
Work Hardening ◽  
Wire Drawing ◽  
Recrystallization Temperature ◽  
Drawing Process ◽  
Microscopic Images ◽  
Before And After ◽  
The Wire

The paper present results of the research on the laboratory drawing process of zinc obtained in industrial conditions in the CCR by Properzi method. The force drawing, mechanical properties before and after process was measured and formability limit in drawing process was specified. Because the wire drawing process was on hot (above the recrystallization temperature) the material didn’t work hardening as a function of strain which reduces the ductility and breaking just after the die. The microscopic images of microstructure reveal the presence of large twins recrystallization reflecting the dynamic renewal structure.

Nanostructure Formation during Deep Wire-Drawing of Copper

2010 ◽  
Vol 654-656 ◽  
pp. 1201-1204
Author(s):  
Nobuhiro Tsuji ◽  
Kenichi Hanazaki
Keyword(s):  
Mechanical Properties ◽  
Deformation Process ◽  
Copper Wire ◽  
Copper Alloys ◽  
Wire Drawing ◽  
Equivalent Strain ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Plastic Deformation Process ◽  
Purity Copper

It was confirmed in the present study that deep drawing process in multi passes to produce fine wires of copper alloys can act as a kind of severe plastic deformation process. High purity copper was deeply wire-drawn up to an equivalent strain of 6.9, and microstructure evolution and change in mechanical properties were investigated. It was confirmed that deep wire-drawing process produced nanostructures composed of fiber-shaped ultrafine grains with a diameter of about 300 nm. The copper wires having nanostructures showed tensile strength of 480MPa, which was two times higher than that of the starting material. The microstructures and mechanical properties of the deep drawn copper wire were almost equivalent with those of the copper sheets severely deformed by ARB process, though there were some minor differences between two processes.

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