Effect of Hot Extrusion Parameters on Tensile Strength and Fracture Behavior in Direct Recycling of Aluminium Alloy (6061) Chips

2020 ◽  
Vol 975 ◽  
pp. 229-234
Author(s):  
Mohammed H. Rady ◽  
Mohammad Sukri Mustapa ◽  
Shazarel Shamsudin ◽  
Mohd Amri Lajis ◽  
Mohd Idrus Mohd Masirin ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Optimum Condition ◽  
Fracture Behavior ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
High Tensile Strength ◽  
Preheating Temperature ◽  
Aluminum Chips ◽  
Full Factorial ◽  
Alloy 6061

Produced Profiles by direct recycling of aluminum chips in hot extrusion process were achieved by temperature related parameters using preheating temperature 450 °C, 500 °C, and 550 °C for duration 1 hour, 2 hours, and 3 hours preheating time. By using Design of Experiments (DOE) procedure with full factorial design and three center points analysis, the results showed that the preheating temperature factor is more important to be controlled rather than the preheating duration and increase of temperature conducted to the high tensile strength. The profiles extruded at 550 °C and 3 hours’ duration had obtained the optimum condition to get the maximum tensile strength. The influence of parameters of hot extrusion process on fracture surfaces of the recycled samples was also investigated and discussed.

Effect of Heat Treatment on Tensile Strength of Direct Recycled Aluminium Alloy (AA6061)

2019 ◽  
Vol 961 ◽  
pp. 80-87
Author(s):  
Mohammad Hussein Rady ◽  
Ahmed Sahib Mahdi ◽  
Mohammad Sukri Mustapa ◽  
Shazarel Shamsudin ◽  
Mohd Amri Lajis ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Solid State ◽  
Aging Process ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
High Tensile Strength ◽  
Quenching Temperature ◽  
Preheating Temperature ◽  
Aluminum Chips

Products by solid-state recycling of aluminum chips in hot extrusion process were controlled by temperature related parameters using preheating temperature 450 °C, 500 °C, and 550 °C for 1 hr, 2 hr, and 3 hr preheating time. By using Design of Experiments (DOE), the results found that the preheating temperature is more important to be controlled rather than the preheating time and increasing of temperature led to the high tensile strength. The profile extruded at 550 °C with 3 hr duration had gained the optimum case to get the maximum tensile strength. For the optimum case, heat treatment was carried out using quenching temperature at 530 oC for 2 h and aging process at 175 oC for 4 h. The tensile strength of extrudes specimen was improved significantly compared to those of non-treated specimen.

Strength Performance of Micro Alumina Reinforced Direct Recycled AA6061 Chips Based Matrix Composite

2019 ◽  
Vol 961 ◽  
pp. 73-79
Author(s):  
Muntadher S. Msebawi ◽  
Jayaprakash Murugesan ◽  
Shazarel Shamsudin ◽  
Mohammad Hussein Rady ◽  
Huda M. Sabbar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Volume Fraction ◽  
Hot Extrusion ◽  
Primary Concern ◽  
Strength Performance ◽  
Point Analysis ◽  
Preheating Temperature ◽  
Metal Chips ◽  
Key Variables ◽  
Full Factorial

Ultimate tensile strength (UTS) becomes a primary concern in direct recycling of metal chips. This study investigates the influences of preheating temperature, preheating time and volume fraction of alumina on the tensile strength performance. The parameters of temperature, time and volume fraction of micro alumina were varied between 450 - 550 oC, 1 - 3 hours and 5 - 15% respectively. The full factorial design with center point analysis was employed to analyse the effect of process variables on the response. A total of 19 experimental runs were performed through the hot extrusion operation. The preheating temperature and volume fraction were identified as the key variables affecting the UTS. An optimum UTS was obtained for the profile extruded at 550 oC, 3 hours duration and 5% volume fraction of alumina.

scholarly journals Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 663
Author(s):  
Thomas Borgert ◽  
Werner Homberg
Keyword(s):  
High Efficiency ◽  
Research Work ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Efficient Production ◽  
Secondary Aluminum ◽  
Shape Accuracy ◽  
Aluminum Chips ◽  
Spinning Process ◽  
Complex Parts

Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.

Effects of Hot Extrusion and Aging on Microstructure and Mechanical Properties of Mg-Zn-Si-Ca Magnesium Alloy

2013 ◽  
Vol 668 ◽  
pp. 823-829 ◽  
Author(s):  
Xiu Qing Zhang ◽  
Ge Chen ◽  
Yang Wang ◽  
Min Yu Han
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Ultimate Tensile Strength ◽  
Cast Alloy ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Deformation Ability

Homogenized magnesium alloy Mg-6Zn-Si-0.25Ca has been hot-extruded and then aging treated for improving the magnesium alloy plastic deformation ability and promoting applications of magnesium alloys. In the hot extrusion process, the influences of extrusion parameters for microstructures and mechanical properties of Mg-6Zn-Si-0.25Ca magnesium alloy were investigated. The results show that dynamic recrystallization occurred during hot extrusion. Compared with as-cast alloy, the grains are fined remarkably, and the mechanical properties are enhanced obviously. Twin crystals appeared in grains after hot extrusion, with the extrusion temperature rising, twin crystal structures has been reduced. Aging further increased the mechanical properties of the estruded alloy. The ultimate tensile strength of Mg-6Zn-Si-0.25Ca alloy is about 385 MPa and the elongation is about 11% when extruded at 320°C(extrusion ratio is 10) and aged at 190°C for 8h.

On the Study of a TiB2 Nanoparticle Reinforced 7075Al Composite with High Tensile Strength and Unprecedented Ductility

2018 ◽  
Vol 941 ◽  
pp. 1933-1938
Author(s):  
Yu Ma ◽  
Gang Ji ◽  
Zhe Chen ◽  
Ahmed Addad ◽  
Vincent Ji
Keyword(s):  
Tensile Strength ◽  
Hot Extrusion ◽  
Total Elongation ◽  
Industrial Applications ◽  
Processing Route ◽  
High Tensile Strength ◽  
Friction Stir ◽  
Average Grain Size ◽  
Elongation To Failure ◽  
Strength And Ductility

Strength and ductility are the two most important mechanical properties of a structural material. However, they are often mutually exclusive. In this study, a 6 wt. % TiB2 nanoparticle reinforced 7075Al (i.e. TiB2/7075Al) composite was designed and produced by the processing route combining casting, friction stir processing, hot extrusion and T6 heat treatment. The result of tensile testing demonstrates that the as-processed composite sample presents an ultimate tensile strength of 677 MPa and a total elongation to failure of around 15 %, being higher than any Al or Al based materials ever reported. The typical microstructure contains the TiB2 reinforcement nanoparticles uniformly distributed in the equiaxed Al grain matrix (2 μm in average grain size). In addition to the dispersed nanoprecipitates of the 7075Al (Al-Zn-Mg-Cu) matrix, the integrated TiB2 nanoparticles are systematically decorated by a shell corresponding to (Zn1.5Cu0.5)Mg. This finding challenges our understanding and opens a door for further enhancing strength and ductility being easily scalable for industrial applications.

Influence of Hot Extrusion Process on the Mechanical Behavior of AA6061/SIC Composites

2011 ◽  
Vol 264-265 ◽  
pp. 141-148
Author(s):  
Amir Pakdel ◽  
Hassan Farhangi ◽  
M. Emamy
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Fracture Behavior ◽  
Density Measurement ◽  
Hot Extrusion ◽  
Stir Casting ◽  
Extrusion Process ◽  
Matrix Composites ◽  
Sic Composites ◽  
Average Size

The effect of hot extrusion process on the microstructure, mechanical properties and fracture behavior of metal-matrix composites (MMCs) of AA6061 alloy reinforced with 10 volume percent particulate SiC with the average size of 46 µm was studied. The MMC ingots were fabricated by the stir casting method and were extruded at 450°C at a ram speed of 1mm/s and at the extrusion ratios of 6:1, 12:1 and 18:1. Various techniques including metallography, density measurement, tensile testing, and SEM fractography were utilized to characterize the mechanical behavior of the MMCs. Results demonstrated that extruded composites possessed considerably lower porosity contents, higher strength, and enhanced ductility in comparison with the as-cast samples. In addition, further improvement in the mechanical properties of the extruded composites was noticed by increasing the extrusion ratio. Fractographic observations revealed that the brittle fracture behavior of the as-cast specimens was promoted by cracking of the large SiC particle clusters. Whereas, the fracture surfaces of extruded composites showed extensive tear ridge formation by initiation and growth of shallow dimples, around the cracked particles, which is characteristic of a ductile fracture process. This change in the fracture behavior and improvement in mechanical properties is attributed to the break up of particle clusters and diminishment of pores during the extrusion process.

scholarly journals Machinable Cu-40Zn Composites Containing Graphite Particles by Powder Metallurgy Process

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Hisashi Imai ◽  
Yoshiharu Kosaka ◽  
Akimichi Kojima ◽  
Junko Umeda
Keyword(s):  
Tensile Strength ◽  
Powder Metallurgy ◽  
Hot Extrusion ◽  
Graphite Powder ◽  
Environmentally Benign ◽  
High Tensile Strength ◽  
Graphite Particles ◽  
Powder Metallurgy Process ◽  
Metallurgy Process ◽  
Zn Alloys

Advanced Cu-40mass%Zn alloys with a high tensile strength and excellent machinability have been developed via a powder metallurgy (P/M) process. They are environmentally benign because fine graphite particles are included instead of lead (Pb) to improve their machinability. The effect of the content and particle size of the graphite on the mechanical properties and machinability are investigated in this paper. When applying a conventional P/M process consisting of the cold compaction and hot extrusion to consolidate elementally premixed mixture of Cu-40mass%Zn and graphite powder, the addition of 1 mass% graphite particles with  m in diameter is suitable to obtain a high tensile strength and good machinability at the same time.

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.

scholarly journals Ductile Fracture Behavior of Mild and High-Tensile Strength Shipbuilding Steels

2020 ◽  
Vol 10 (20) ◽  
pp. 7034
Author(s):  
Burak Can Cerik ◽  
Joonmo Choung
Keyword(s):  
Tensile Strength ◽  
Stress State ◽  
Ductile Fracture ◽  
Fracture Behavior ◽  
Maximum Shear Stress ◽  
Stress Triaxiality ◽  
Fracture Model ◽  
Loading Path ◽  
Alternative Form ◽  
High Tensile Strength

A comparison is made of the ductility limits of one mild (normal) and two high-tensile strength shipbuilding steels with an emphasis on stress state and loading path dependency. To describe the ductile fracture behavior of the considered steels accurately, an alternative form of ductile fracture prediction model is presented and calibrated. The present fracture model combines the normalized Cockcroft–Latham and maximum shear stress criterion, and is dependent on both stress triaxiality and Lode angle parameter. The calibrations indicate that, depending on the hardening characteristics of the steels, ductile fracture behavior differs considerably with stress state. It is demonstrated that the adopted fracture model is able to predict the ductile fracture initiation in various test specimens with good accuracy and is flexible in addressing the observed differences in the ductile fracture behavior of the considered steel grades.

Effect of Hot Extrusion Process on Microstructure and Properties of Wide and Hollow AZ31 Magnesium Alloy Profiles

2013 ◽  
Vol 710 ◽  
pp. 21-24 ◽  
Author(s):  
Jian Gang Lv ◽  
Gao Feng Quan ◽  
Rui Chun Li ◽  
Chun Yuan Shi ◽  
Ying Bo Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Extrusion Temperature ◽  
Az31 Magnesium Alloy ◽  
Significant Heterogeneity ◽  
Transport Equipment ◽  
Strength And Ductility

According to the profile section of transport equipment, the wide and hollow AZ31 magnesium alloy profiles was self-designed. Extrusion molding performance of the profiles, the law of microstructure and mechanical properties were studied when billets pretreatment and extrusion temperature were changed. The conclusions are as follows: (1) The grains of AZ31 profiles extruded by pre-extrusion billet are smaller and the strength is better, its maximum tensile strength is 280MPa. (2) Other processes being equal, the grains of AZ31 profiles are smaller and strength is higher, but the plastic is bad, when the extrusion temperature is 300°C. However, both strength and ductility of AZ31 profiles are better, when the extrusion temperature is 350°C. (3) Wide and Hollow AZ31 profiles perform significant heterogeneity and anisotropic characteristics on mechanical properties.

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