Solid state recycling of aluminium alloys via a porthole die hot extrusion process: Scaling up to production

2017 ◽  
Author(s):  
Dimos Paraskevas ◽  
Karel Kellens ◽  
Yelin Deng ◽  
Wim Dewulf ◽  
Carlos Kampen ◽  
...  
Keyword(s):  
Solid State ◽  
Aluminium Alloys ◽  
Hot Extrusion ◽  
Scaling Up ◽  
Extrusion Process ◽  
Porthole Die ◽  
Process Scaling

Constitutive Laws for the Deformation Estimation of Extrusion Die in the Creep-Fatigue Regime

2011 ◽  
Vol 491 ◽  
pp. 233-240 ◽  
Author(s):  
Barbara Reggiani ◽  
Lorenzo Donati ◽  
Luca Tomesani
Keyword(s):  
Experimental Data ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Primary Phase ◽  
Time Curve ◽  
Hardening Law ◽  
Porthole Die ◽  
Creep Fatigue ◽  
Temperature Levels ◽  
Testing Condition

Tools are exposed to severe working conditions during the hot extrusion process. In particular, dies and mandrels can be subjected to an excessive amount of deformation as a result of the developed high cyclic loads and temperatures. In this scenario, a physical experiment reproducing the thermo-mechanical conditions of a mandrel in a porthole die was performed with the Gleeble machine on the AISI H11 tool steel with the aim to investigate the mechanisms that influence the die deformation. The design of experiment consisted of 4 levels of temperature, 3 levels of stress and 3 types of load, i.e. pure creep, pure fatigue and creep-fatigue. In all the testing conditions, a comparable pattern of the mandrel displacement-time curve was found reproducing the 3 stages of softening typical of the strain evolution in a standard creep test but with a marked primary phase. Thus, with the aim to identify an easy-applicable equation to estimate the die deformation, the time hardening creep law was chosen. Coefficients of the time-hardening law were optimized, for each testing condition, on the basis of experimental data starting from values for similar alloys taken from the literature. Results in terms of mandrel displacement were then compared to experimental data for the creep-fatigue condition at different stress and temperature levels. The values found were validated against additional experimental data performed with different specimen geometries. A good average agreement was found between experimental and numerical results. The developed procedure was then applied to an industrial die.

In-Situ Solid-State Synthesis of Mg Composite with Mg2Si Dispersoids

2005 ◽  
Vol 475-479 ◽  
pp. 497-500
Author(s):  
Ritsuko Tsuzuki ◽  
Katsuyoshi Kondoh
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
High Performance ◽  
Extrusion Direction ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Synthesis Temperature ◽  
Solid State Synthesis ◽  
Casting Alloys

Super light and high performance Mg2Si/Mg composites, which had excellent mechanical properties, were developed via the combination of solid-state synthesis and hot extrusion process. In this study, cold compacting (CP) and repeated plastic working (RPW) were firstly carried out for the mixture of Mg-Si powders, and the refinement of both Mg grains and dispersoids. Each specimen was evaluated by observation of microstructure and tensile test. As a result, it was understood that Mg2Si dispersoids were refined and dispersed into Mg matrix, and were flowed along extrusion direction. And their mechanical properties were higher than the conventional die casting alloys. Also the effect of RPW as the improvement of properties and the decrease of synthesis temperature were confirmed.

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.

Effects on Mechanical Properties of Solid State Recycled Aluminium 6061 by Extrusion Material Processing

2017 ◽  
Vol 730 ◽  
pp. 317-320 ◽  
Author(s):  
Syaiful Nizam Ab Rahim ◽  
Mohd Amri Lajis
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Solid State ◽  
Aluminium Alloy ◽  
High Performance ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Structural Features ◽  
Processing Route ◽  
6061 Aluminium Alloy

In this research, mechanical properties of recycled 6061 aluminium alloy, produced by solid state recycling through extrusion, were compared to as-received billets. Aluminum 6061 chips were extruded using a hot extrusion machine. The effects of extrusion parameters on the mechanical properties of the produced recycled 6061 aluminium alloy were investigated. The objective of the study was to analyze the mechanical and structural features of the alloy after plastic consolidation. The extrusion processes were conducted at different preheat temperatures and preheat times, while the ram speed was kept constant. The findings of the study highlighted the potential of combining the extrusion process parameters as an efficient processing route for production of high quality and high-performance type of extruded billets. Tensile test results showed that, material extruded at 550°C exhibited better mechanical properties compared to that extruded at 400°C. The higher temperature resulted in a higher tensile strength being produced, at the expense of a trade-off in ductility. Overall, it was revealed that, the ultimate tensile strength (UTS) and elongation (ETF) of the produced recycled 6061 aluminium through extrusion exhibited mechanical and structural properties comparable to those of the as-received billets.

scholarly journals AA7075-ZrO2 Nanocomposites Produced by the Consecutive Solid-State Process: A Review of Characterisation and Potential Applications

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 805
Author(s):  
Huda M. Sabbar ◽  
Zulkiflle Leman ◽  
Shazarel B. Shamsudin ◽  
Suraya Mohd Tahir ◽  
Che N. Aiza Jaafar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Zirconium Oxide ◽  
High Performance ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Superior Performance ◽  
High Yield ◽  
State Process ◽  
Metal Chips

Solid-state recycling is a direct conversion method for producing metal chips, whereas the materials are plastically deformed into the final product without melting, offering lower energy consumption and metal waste. This technique was reported for fabricating aluminium-zirconium oxide (Al-ZrO2) composite and it was widely used to avoid metal chips bounding at high temperatures during the extrusion process. Aluminium alloy (AA7075) is known for its high yield strength of more than 500 MPa under optimum ageing conditions. However, AA7075 can be further reinforced by zirconium oxide nanoparticles when needed for high-performance applications. Hot extrusion is used to obtain better mechanical properties of composite materials. The equal channel angular pressing (ECAP), a severe plastic deformation technique, was recently used to produce bulk and light recycled metal chips, such as porosity-free and ultra-fine-grained aluminium nanocomposites (ANCs). Heat treatments (HT) and ECAP post hot extrusion are mostly incorporated to improve tribological and mechanical properties and aluminium nanocomposite bonding efficiency. In this review, ANCs’ fabrication by the hot extrusion technique and the effects of ZrO2 nanoparticle are duly summarised and discussed. Furthermore, this review emphasises the importance of using HT and ECAP techniques to acquire better metal alloy incorporation, such as AA7075-ZrO2. Interestingly, owing to the lightweight properties and superior performance of AA7075-ZrO2, it was reported to be suitable for fabricating many drones’ parts, military equipment, and some other promising applications.

Analysis and optimization of hot extrusion process on strenx steel 900

2021 ◽  
Author(s):  
A. Damodar Reddy ◽  
P.N. Karthikeyan ◽  
S. Krishnaraj ◽  
Adarsh Ajayan ◽  
K. Sunil Kumar Reddy ◽  
...  
Keyword(s):  
Hot Extrusion ◽  
Extrusion Process
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