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.

Fabrication of Copper Clad Aluminum Wire (CCAW) by Indirect Extrusion and Drawing

2004 ◽  
Vol 449-452 ◽  
pp. 317-320 ◽  
Author(s):  
Hyouk Chon Kwon ◽  
Taek Kyun Jung ◽  
Sung Chul Lim ◽  
Mok Soon Kim
Keyword(s):  
Bonding Strength ◽  
Annealing Temperature ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Core Material ◽  
Aluminum Wire ◽  
The Core ◽  
The Difference ◽  
Sheath Material

The optimized extrusion conditions from the present research were the extrusion temperature of 573~623K and the extrusion ratio(A0/A) of 21.39. Above the extrusion temperature of 623K, the fracture of sheath material was observed. It is due to the difference of flow stress between the sheath material and the core material during extrusion process. The bonding strength increased with increasing the extrusion temperature and the extrusion ratio. The bonding strength increased with increasing the annealing temperature. However, over 573K, it decreased abruptly since the thick and brittle intermetallic compounds of larger than 3µm were formed. The electricalconductivity of copper clad aluminum wire was about 70%IACS without annealing.

Simulation of the Hot Extrusion Process of Sintered WCu40 Covered with a Steel Cup

2013 ◽  
Vol 762 ◽  
pp. 520-525
Author(s):  
Qiang Lin ◽  
Zu Yan Liu ◽  
Xin Yan Su
Keyword(s):  
Powder Compact ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Optimal Parameters ◽  
Stress Strain ◽  
Strain Relationship ◽  
Relationship Of

In this paper, based on the determination of the stress-strain relationship of sintered W-40wt.%Cu by upsetting tests, the hot extrusion process of the materials covered with a steel cup has been simulated by DEFORM. The effect of the thickness of steel cup, extrusion temperature and extrusion ratio on the extrusion process has been studied, so that a group of optimal parameters could be obtained which is useful to the experiment of powder compact by extrusion with cups.

Microstructure Evolution and Mechanical Properties of Extruded Mg-Al-Zn-Sn Alloy Sheets

2017 ◽  
Vol 898 ◽  
pp. 300-304
Author(s):  
Qing Shan Yang ◽  
Wen Jun Liu ◽  
Zu Jian Yu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Mg Alloy ◽  
Casting Method ◽  
Mechanical Responses ◽  
Room Temperature Ductility ◽  
Differential Speed ◽  
Scanning Electron

The microstructure and mechanical responses of the AZ31 with the addition of 1.8% Sn alloys have been studied and compared. Mg alloy sheets were prepared with metal model casting method and subsequent processes by conventional extrusion (CE) and differential speed extrusion (DSE). Mg alloys were hot extruded at 400oC with the extrusion ratio of 101:1. The microstructure of Mg alloy sheets was examined by optical microscopy (OM) and scanning electron microscope (SEM). The results indicated that the grains were dynamically recrystallized after the extrusion process. Moreover, DSE process dramatically enhanced the room temperature ductility of the extruded sheets. It was also presented that the Mg alloy processed by DSE exhibite a classical dimple structure as a result of slip accumulation and ductile tear.

Dynamic Precipitation Behaviors and Mechanical Properties of Mg-12Gd-3Y-0.5Zr Alloy Processed by Secondary Extrusion

2013 ◽  
Vol 747-748 ◽  
pp. 192-197
Author(s):  
De Jiang Li ◽  
Yin Peng Zhou ◽  
Xiao Qin Zeng ◽  
Wen Jiang Ding ◽  
Bin Chen ◽  
...  
Keyword(s):  
Grain Size ◽  
Volume Fraction ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Water Quenching ◽  
Age Hardening ◽  
Metallographic Analysis ◽  
Air Cooling ◽  
Dynamic Precipitation ◽  
Average Grain Size

Secondary extrusion at 350 °C with the extrusion ratio of 12.25, 25 and 44 was carried out on the Mg-12Gd-3Y-0.5Zr (GW123K) alloy, and the cooling method of the secondary extruded alloys was air cooling and water quenching. Quantitative metallographic analysis method was also employed to study the distribution and volume fraction of dynamic precipitates during the extrusion process. The results showed that secondary extrusion could result in significant grain refinement and the grain size increased with extrusion ratio, which the minimum average grain size was about 5.4μm in the alloy under λ=12.25. The volume fraction of dynamic precipitates decreased with increasing extrusion ratio and the maximum volume fraction was measured to be about 49.2% in the alloy under λ =12.25. Water quenching after extrusion can effectively inhibit dynamic precipitation and the volume fraction of the precipitates ratio decreased from 41.1% after air cooling to 19.6% after water quenching in the same extrusion condition. Tensile properties results showed that the age hardening response of the alloys was decreased by dynamic precipitation and water quenching was an efficient method which is able to avoid this behavior in some extent.

The Grain Size Evolution of AZ31 Profiles as a Function of Different Casting Conditions

2005 ◽  
Vol 488-489 ◽  
pp. 349-356 ◽  
Author(s):  
Franka Pravdic ◽  
H. Kilian ◽  
M. Brandecker ◽  
C. Wögerer ◽  
G. Traxler
Keyword(s):  
Grain Size ◽  
Casting Machine ◽  
Az31 Alloy ◽  
Extrusion Process ◽  
Direct Chill ◽  
Mechanical Tests ◽  
Direct Chill Casting ◽  
Metallographic Analysis ◽  
Process Chain ◽  
Chill Casting

The present paper describes the microstructural evolution of AZ31 alloy along the process chain, from the melt treatment, the direct chill casting up to the extrusion process. Each step in the process chain will be considered in order to design the appropriate properties of the endproducts. The research has been done in industrial scale at ARC Leichtmetallkompetenzzentrum Ranshofen GmbH (LKR), in order to analyse the grain size dependency of AZ31 alloy on different casting conditions. The casting trials with and without grain refinement were carried out at the vertical direct chill casting machine MAGNUMCAST®. After the extrusion process metallographic analysis and mechanical tests were carried out.

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.

The Effects of Extrusion Ratio and Friction on Material Microstructures during Sandglass Extrusion Process

2007 ◽  
Vol 551-552 ◽  
pp. 383-386
Author(s):  
W.L. Lu ◽  
Y. Wang ◽  
Jin Tao Hai
Keyword(s):  
Grain Size ◽  
Free Space ◽  
Large Strain ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Experimental Results ◽  
Ultrafine Grain ◽  
Theory Analysis ◽  
Ultrafine Grain Size ◽  
Mould Cavity

Sandglass extrusion is an ultrafine grain size method. Due to the repetitive and multiple extrusions, large strain can be accumulated and ultrafine grain size can be obtained. Some factors can affect the experimental results of sandglass extrusion, such as extrusion ratio, number of extrusion, extrusion temperature, friction and free space in mould cavity etc. These factors have different effects on material microstructures, properties and defects. In this paper, the effects of extrusion ratio and friction on material microstructures during sandglass extrusion process have been discussed and theory analysis and experimental results have been reported.

scholarly journals Effects of Hot Extrusion Temperature on Mechanical and Corrosion Properties of Mg-Y-Zn-Zr Biological Magnesium Alloy Containing W Phase and I Phase

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1147
Author(s):  
Xiaofeng Wu ◽  
Chunxiang Xu ◽  
Jun Kuan ◽  
Zhengwei Zhang ◽  
Jingshan Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Thermal Processing ◽  
Cast Alloy ◽  
Variable Temperature ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Corrosion Performance ◽  
Corrosion Properties ◽  
Mechanical And Corrosion Properties

The previous study conducted on the as-cast Mg-2Y-1Zn-0.6Zr alloy showed that the tensile strength, yield strength and elongation of the as-cast alloy were 245 MPa, 135 MPa and 14.4%, respectively. In order to further explore the potential of the material, the hot extrusion process of variable temperature (250 °C, 300 °C and 350 °C) was carried out on the basis of the as-cast alloy. After hot extrusion, the mechanical properties of the material have been greatly improved compared with as-cast alloy. The tensile strength, yield strength and elongation of the extruded alloy reached 327 MPa, 322 MPa and 24.9%, respectively. The reason for the significant improvement of material properties is mainly due to the dynamic recrystallization during thermal processing, which greatly fines the grains of as-cast alloy. Moreover, the experimental results shown that the corrosion performance of the alloy after hot extrusion at 300 °C is also optimal.

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