scholarly journals Influence of the Microstructure of the Initial Material on the Zn Wires Prepared by Direct Extrusion with a Huge Extrusion Ratio

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 787
Author(s):  
Jaroslav Čapek ◽  
Lukáš Kadeřávek ◽  
Jan Pinc ◽  
Jaromír Kopeček ◽  
Ladislav Klimša
Keyword(s):  
Grain Size ◽  
Mechanical Characteristics ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Coarse Grained ◽  
Initial Material ◽  
Direct Extrusion ◽  
Final Microstructure ◽  
Preliminary Study ◽  
Bimodal Grain Size

In this study, we prepared zinc wires with a diameter of 250 µm by direct extrusion using an extrusion ratio of 576. We studied the influence of the extrusion temperature and microstructure of the initial Zn billets on the microstructural and mechanical characteristics of the extruded wires. The extrusion temperature played a significant role in the final grain size. The wires extruded at 300 °C possessed a coarse-grained microstructure and the shape of their tensile stress–strain curves suggested that twinning played an important role during their deformation. A significant influence of the initial grain size on the final microstructure was observed after the extrusion at 100 °C. The wires prepared from the billet with a very coarse-grained microstructure possessed a bimodal grain size. A significant coarsening of their microstructure was observed after the tensile test. The wires prepared from the medium-grained billets at 100 °C were relatively coarse-grained, but their grain size was stable during the straining, resulting in the highest ultimate tensile strength. This preliminary study shows that strong attention should be paid to the extrusion parameters and the microstructure of the initial billets, because they significantly influence the microstructure and mechanical behavior of the obtained wires.

Modern sands derived from the Vertiskos Unit of the Serbomacedonian Massif (N. Greece): a preliminary study on the weathering of the Unit

2012 ◽  
Vol 4 (3) ◽  
Author(s):  
Ioannis Georgiadis ◽  
Antonios Koroneos ◽  
Ananias Tsirambides ◽  
Michael Stamatakis
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Mineralogical Composition ◽  
Coarse Grained ◽  
Northern Greece ◽  
Physical Weathering ◽  
Metamorphic Basement ◽  
Preliminary Study ◽  
Active Channels ◽  
Mineral Constituents

AbstractModern sand samples were collected from the Vertiskos Unit of the Serbomacedonian Massif, northern Greece, and were examined for their texture and mineralogical composition. They were collected from active channels and torrents. The textural study demonstrated that these modern sands are moderately to very-poorly sorted, often polymodal in grain size distribution, texturally and mineralogically immature to submature, and consist of coarse-grained gravelly sands to slightly-gravelly muddy sands. The dominant composition is quartzofeldspathic. All samples contain detrital minerals of metamorphic origin, mainly amphibole and garnet, in addition to minor amounts of pyroxene and detrital calcite. These sediments were deposited rapidly and close to their source, the metamorphic basement of the Vertiskos Unit. The mineral constituents of the samples indicate that the Vertiskos Unit is undergoing rapid physical weathering due to the temperate and seasonal climate. The results of this study suggest that these modern sands constitute one sedimentary petrologic province comprised of primarily of amphibole-garnet.

Comparison between Addition of Titanium and Titanium Plus Boron to MgAZ31 on its Grain Size and its Mechanical Characteristics

2016 ◽  
Vol 689 ◽  
pp. 17-22
Author(s):  
Adnan I.O. Zaid
Keyword(s):  
Grain Size ◽  
Melting Point ◽  
Mechanical Characteristics ◽  
Maximum Density ◽  
Direct Extrusion ◽  
Damping Characteristics

Magnesium and its alloys are the lightest constructional available materials on earth with a maximum density of 1.78 g /cc and melting point of 650 ͦC, with good damping characteristics. Therefore; they are alloyed or micro alloyed with other elements. In this paper comparison between the addition of Ti and Ti+ B to this alloy on its grain size and its mechanical characteristics is investigated both in the cast and after direct extrusion and the obtained results are presented and discussed.

Influence of Extrusion Temperature on Microstructure, Texture and Fatigue Performance of AZ80 and ZK60 Magnesium Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 187-190 ◽  
Author(s):  
Muhammad Shahzad ◽  
Dan Eliezer ◽  
Wei Min Gan ◽  
Sang Bong Yi ◽  
Lothar Wagner
Keyword(s):  
Grain Size ◽  
Yield Stress ◽  
Magnesium Alloys ◽  
Crystallographic Texture ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Fatigue Performance ◽  
Tension And Compression

The wrought magnesium alloys AZ80 and ZK60 were extruded at 175°C ≤ T ≤ 350°C at an extrusion ratio of ER = 12. With decreasing extrusion temperatures a marked refinement in grain size was found for both alloys resulting in higher values of yield stress while UTS values were hardly affected. As opposed to AZ80, a marked yield stress differential between loading in tension and compression was observed in ZK60, this effect being explained by the differences in crystallographic texture.

Effect of Extrusion Ratio on Microstructure and Mechanical Properties of As-Cast AZ91D Magnesium Alloy

2012 ◽  
Vol 445 ◽  
pp. 237-240
Author(s):  
Bao Hong Zhang ◽  
Zhi Min Zhang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Extrusion Ratio ◽  
Experimental Results ◽  
Direct Extrusion ◽  
Az91d Magnesium Alloy ◽  
Microstructure And Mechanical Properties

In order to study the effect of deformation extent on microstructure and mechanical properties of as-cast AZ91D magnesium alloy, experiments of direct extrusion were performed at temperature of 420 and different extrusion ratios. The microstructure and mechanical properties of billets and extrudates were measured. Experimental results show that the grain size of as-cast AZ91D magnesium alloy can be dramatically refined by extrusion. Direct extrusion can obviously improve the mechanical properties of as-cast AZ91D magnesium Alloy, comparing with the pre-extruded billet, the tensile strength, yield strength and elongation of extrudate can be improved by at least 83%, 154% and 150% respectively. As the extrusion ratio increases, the tensile strength and yield strength of extrudate will increase at first and then fall.

scholarly journals Microstructures, Mechanical and Corrosion Properties of the Extruded AZ31-xCaO Alloys

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1467 ◽  
Author(s):  
Yalin Lu ◽  
Yang Zhang ◽  
Mengqi Cong ◽  
Xingcheng Li ◽  
Wenting Xu ◽  
...  
Keyword(s):  
Grain Size ◽  
Tensile Testing ◽  
Az31 Alloy ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Corrosion Properties ◽  
Mechanical And Corrosion Properties ◽  
Addition Amount ◽  
Scanning Electron

The effects of the extrusion process and CaO addition amount on microstructure, mechanical, and corrosion properties of AZ31 alloys were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), standard tensile testing, and so on. The grain size of AZ31 or AZ31-1%CaO alloy becomes larger with increasing extrusion temperature. The grain size of AZ31-1%CaO alloy is much smaller than that of AZ31 alloy at the same extrusion temperature. In addition, the formation of the Al2Ca phase caused by CaO addition refines the grain size, and the recrystallization of AZ31-1%CaO alloy is improved significantly. The recrystallization grains distribute more uniformly as the increase of extrusion ratio, and the completely recrystallized grains distribute uniformly in the form of equiaxed crystals with an extrusion ratio of 9. Tensile testing results show that extruded AZ31-1%CaO alloy at the extrusion temperature of 300 °C and an extrusion ratio of 9 exhibits the best mechanical properties. While corrosion properties of AZ31 alloys decreases due to the addition of CaO.

Preparation and Tensile Property of Nanostructured Cu-Ag Alloy with Bimodal Grain Size Distribution

2017 ◽  
Vol 727 ◽  
pp. 432-437
Author(s):  
Ying Guang Liu ◽  
Shi Bing Zhang ◽  
Zhong He Han ◽  
Xiao Yan Zhu
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Volume Fraction ◽  
Tensile Deformation ◽  
Coarse Grained ◽  
Average Grain Size ◽  
Coarse Grains ◽  
Bimodal Grain Size ◽  
Bimodal Grain Size Distribution

Nanostructured Cu-Ag alloys with bimodal grain size distribution were prepared and their tensile deformation behaviors were studied. The alloys were processed by hot isostatic pressing of blends of nanoand micrometer-sized powder particles. The microstructure of the alloys consisted of nanograins with an average grain size of 40 nm and coarse-grains with an average grain size of 30 um. The bimodal structured alloy exhibited high tensile strengths 522 MPa and a large plastic strain to failure approximately 30%. Simultaneously, Their tensile stress-strain curves displayed a long work-hardening region, and their tensile ductility increased with increasing coarse-grained volume fraction. The high strength primarily results from the contribution of nanograins, while the enhanced ductility may be attributed to the improved strain hardening capability by the presence of coarse grains.

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