scholarly journals Effects of stirring parameters on the rheocast microstructure and mechanical properties of aluminum alloy ADC12

2018 ◽  
Vol 197 ◽  
pp. 12004 ◽  
Author(s):  
Syaharuddin Rasyid ◽  
Effendy Arif ◽  
Hairul Arsyad ◽  
Muhammad Syahid
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Dendritic Structure ◽  
Hardness Test ◽  
Metal Mold ◽  
Gravity Casting ◽  
Microstructure Characteristics ◽  
Short Period ◽  
Primary Particles ◽  
Stirring Time

In this study, effects of stirring time and stirring speed on the microstructure of semisolid rheocast (SSR) aluminum alloy ADC12 were examined. The research method was done by gravity casting using a metal mold. The aluminum ADC12 slurry is stirred by a mechanical stirrer (round rod stirrer) at 610OC with a variation of speed 0, 250, 300, 350 rpm for 0, 20, 40, 60 seconds. Furthermore, the aluminum slurry of ADC12 is poured on a metal mold with temperature 600OC. The microstructure characteristics were examined by direct observation using optical microscopy, secondary -Al phase dendrite arm spacing, shape factor, and Si eutectic phase were identified. The mechanical properties were investigated by hardness test and tensile test. A short period of stirring below the liquidus temperature to form a non-dendritic structure. The final morphology of the primary particles after a short period of stirring time has little impact as the stirring time increases. The optimal mechanical properties (hardness and tensile strength) were obtained at 20 seconds of stirring time and 300 rpm of stirring rate.

Effect of Severe Plastic Deformation at Ambient Temperature on Microstructures and Mechanical Properties of Aluminum Alloy 2519

2013 ◽  
Vol 745-746 ◽  
pp. 298-302
Author(s):  
Ying Liu ◽  
Ruo Lin Cheng ◽  
Jing Tao Wang ◽  
He Zhang ◽  
Xin Ming Zhang
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
Cold Rolling ◽  
Ambient Temperature ◽  
Hardness Test ◽  
Equal Channel Angular Processing ◽  
Microstructures And Mechanical Properties

The effect of severe plastic deformation at ambient temperature on microstructures and mechanical properties of aluminum alloy 2519 was investigated by means of tensile test, micro-hardness test, optical microscopy and scanning electron microscopy. The results showed that tensile strength of as-queched 2519 alloy was greatly enhanced to nearly 550MPa (ultimate tensile strength, UTS) and 520MPa (yield strength, YS) by severe cold rolling or equal channel angular processing (ECAP) while the elongation decreased to 5%. The 2519 alloy could obtain quite well mechanical properties as much as 80 % and 12 passes cold rolling deformation. This indicated that pre-deformation by ECAP is effective in improving the mechanical properties of 2519 alloy by grain refinement, strain aging and high density dislocations.

Influence of Overburning on Microstructure and Property of 6061 Aluminum Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 118-121 ◽  
Author(s):  
Shi Xing Zhang ◽  
Shao Min Qu
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Solution Treatment ◽  
Hardness Test ◽  
Treatment Temperature ◽  
Experimental Results ◽  
Solution Treatment Temperature ◽  
6061 Aluminum Alloy ◽  
Microstructure And Mechanical Properties

Process of solution treatment of 6061 aluminum alloy was done by hardness test and microanalysis in this paper. The effects of different solution treatment temperature on the microstructure and mechanical properties of 6061 aluminum alloy were studied and the influence of overburning on the microstructure and mechanical properties of 6061 aluminum alloy were also analyzed. The experimental results show that overburning occurring while 6061 aluminum alloy is heated above 580°C . The hardness measurements and microstructure analysis results show that the hardness decreased, grain boundary becomes trigemanal and compounded –melting structure (burnt structure) appeared when overburning occuring for this alloy .

Crack Repairing of Aluminum Alloy 6061 by Reinforcement of Al2O3 and B4C Particles Using Friction Stir Processing

2021 ◽  
Vol 875 ◽  
pp. 238-247
Author(s):  
Zunair Masroor ◽  
Ahsan Abdul Rauf ◽  
Faisal Mustafa ◽  
Syed Wilayat Husain
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Microstructural Analysis ◽  
Hardness Test ◽  
X Ray Diffraction ◽  
Crack Line ◽  
Friction Stir ◽  
Mechanical Methods ◽  
Weld Parameters

Crack repairing of aluminum alloys is done using conventional welding techniques or mechanical methods, which results in the redundancy of mechanical properties due to defects formation. Friction Stir Welding/Processing (FSW/FSP) is a solid-state joining technique which is used to join various different similar and dissimilar metals, along with the fabrication of surface composites to cater the mentioned problem. The objective of this study is to repair the crack produced in 6061 aluminum alloy by the reinforcement of ceramic particles, Al2O3 and B4C, to further increase the efficiency of the joint along the crack line. Weld parameters, equipment used and the processing conditions are emphasized. The mechanical testing and the characterization of the weld as well as base metal was done and compared using tensile testing, micro hardness test and microstructural analysis. X-Ray Diffraction (XRD) was performed for crystallinity and intermetallic study. The dispersion of the particles was investigated using Field Emission Scanning Electron Microscope (FESEM). The crack in the Al-6061 was effectively repaired using FSP. The reinforced samples showed improved mechanical properties as compared to non-reinforced ones.

Microstructure Characteristics and Properties of 1561 Aluminum Alloy Weldments Processed by Different MIG Welding

2017 ◽  
Vol 893 ◽  
pp. 163-168
Author(s):  
Shan Guo Han ◽  
Shi Da Zheng ◽  
De Tao Cai ◽  
Yao Yong Yi ◽  
Zi Yi Luo
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Weld Zone ◽  
Base Material ◽  
Particle Phase ◽  
Mig Welding ◽  
Single Wire ◽  
Microstructure Characteristics ◽  
Different Characteristics ◽  
Scanning Electron

The mechanical properties and microstructural features of 1561 aluminum alloy weldments processed by single-wire MIG welding and CMT TWIN welding are investigated. The microstructure and mechanical properties of welded joints were studied by nondestructive testing, metallurgical test, scanning electron microscopy test, fatigue and tensile test. It is revealed that the welding efficiency of CMT TWIN welding is more than six times as much as single-wire MIG welding. It can be easy to find weld zone (WZ), fusion line (FL), heat affected zone (HAZ) and base metal (BM) with different characteristics in the metallographic specimen. In weld zone, the particle phase sizes are smaller than that of base material, but the densities of particle phase are increased. The sample fatigue strength of CMT TWIN welding is higher than the singe-wire MIG welding. It is suggested that the CMT TWIN welding has several advantages compared with single-wire MIG welding.

A Study on Cooling Characteristics of AC4C and AC7A Casting Material for Manufacturing Tire Mold

2011 ◽  
Vol 264-265 ◽  
pp. 379-383
Author(s):  
Hee Sung Yoon ◽  
Ho Dong Yang ◽  
Yool Kwon Oh
Keyword(s):  
Aluminum Alloy ◽  
Melting Process ◽  
Cooling Time ◽  
Smelting Furnace ◽  
Metal Mold ◽  
Cooling Process ◽  
Casting Method ◽  
Production Time ◽  
Gravity Casting ◽  
Automobile Tire

This study investigated on the cooling characteristics of AC4C aluminum alloy and AC7A aluminum alloy used as a casting material for manufacturing automobile tire mold by experiment. The metal mold device by gravity casting method was manufactured. AC4C casting material and AC7A casting material were heated in smelting furnace at about 650°C and 670°C, and then they injected into the metal mold device when the melting process was completely finished, respectively. When the melted casting material was completely injected into the metal mold device, the temperature inside the casting was measured by 9 measurement points. Also, when the temperature inside the casting was measured approximately 500°C during the cooling process, the casting is separated to metal mold device and carried out cooling at normal temperature. The separating time from metal mold device of AC4C casting material and AC7A casting material have been taken 25 minutes and 15 minutes, respectively. The final cooling time of AC4C casting material and AC7A casting material have been taken 400 minutes and 380 minutes, respectively. Accordingly, AC7A casting material is able to improve on productivity than AC4C casting material because production time was decreasing.

Industrialized Application of Rheo-HPDC Process for the Production of Large Thin-Walled Aluminum Alloy Parts

2019 ◽  
Vol 285 ◽  
pp. 453-458 ◽  
Author(s):  
Ming Fan Qi ◽  
Yong Lin Kang ◽  
Quan Quan Qiu
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Shrinkage Porosity ◽  
Semisolid Slurry ◽  
High Quality ◽  
Refined Microstructure ◽  
Primary Particles ◽  
Thin Walled ◽  
Pressure Die Casting

A simplified and efficient process, namely air-cooled stirring rod (ACSR), was proposed to prepare semisolid slurry of aluminum alloys. An advanced integrated rheological high pressure die-casting (Rheo-HPDC) technology was established by combining the ACSR equipment with HPDC machines to produce high quality aluminum alloy products. Microstructures, surface qualities, mechanical properties, corrosion resistances and thermal conductivities of the Al-8Si alloy parts prepared by Rheo-HPDC were investigated and compared to those prepared by traditional HPDC. The results indicated that the Rheo-HPDC process can prepare aluminum alloy parts in which the primary particles are fine and spherical, and there is few shrinkage porosity. Multifarious high quality large thin-walled aluminum alloy parts, such as filter shells, cooling shells, antenna crates and mounting brackets for communication, were produced by the process. Rheo-HPDC alloys showed improved surface quality to those formed by traditional HPDC, and the surface roughness is small and avoid employing CNC to surface finish. Also, compared with HPDC alloys, the alloys prepared by Rheo-HPDC have an increased mechanical properties and thermal conductivity due to high density and refined microstructure. Furthermore, Rheo-HPDC aluminum alloys indicated a remarkable improvement in corrosion resistance as shown by the results of electrochemical and weight loss experiments.

Continuous Rheological Forming of A6061 Wrought Aluminum Alloy by Using Helical Shape Stirrer and its Thixoforging Process

2007 ◽  
Vol 26-28 ◽  
pp. 161-166
Author(s):  
Chung Gil Kang ◽  
Sang Mae Lee
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Environmental Issues ◽  
Forming Technology ◽  
Sequence Production ◽  
Stirring Time ◽  
Microstructural Morphology ◽  
Spiral Shape ◽  
Rheological Forming ◽  
Wrought Aluminum

Interest in the rheology forming technology for fabrication of light weight materials and for resolving environmental issues has been growing in industrial and academic society. In this study, the helical shape stirrer was designed to produce rheological material. The experimental variables, which were stirring time 0-1200 sec, stirring velocity 0-100 rpm and melt temperatures for semisolid states, were established. The rheological materials were produced under established experiment conditions, and then mechanical properties were measured. Sequence-production equipments were appended to fabrication system of rheology material to make rheology materials continuously. Therefore, the development of sequence-production system equipped with a specially designed mechanical stirrer in spiral shape was necessary for fabricating fine grains and their uniform globular rheology materials. The thixoforging was experimented with rheological A6061 wrought aluminum alloy fabricated by the spiral shape stirrer. Microstructural morphology of the forged samples was investigated and their mechanical properties characterized.

Microstructure Characteristics and Mechanical Properties of Double-Sided Laser Beam Welded Aluminum Alloy T-Joints

2013 ◽  
Vol 40 (5) ◽  
pp. 0503009
Author(s):  
陈彦宾 Chen Yanbin ◽  
杨志斌 Yang Zhibin ◽  
陶汪 Tao Wang ◽  
陈洁 Chen Jie ◽  
李俐群 Li Liqun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Laser Beam ◽  
T Joints ◽  
Microstructure Characteristics
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