EFFECT OF COMPACTION PRESSURE ON MECHANICAL PROPERTIES OF ALUMINIUM PARTICLE SIZES AA6061 THROUGH POWDER METALLURGICAL PROCESS (original) (raw)
Related papers
The effect of cold compacting parameters for producing recycles aluminium by milling process
2016
Pressing process can be performed in any circumstances for compaction parameters. The optimum conditions were experimentally evaluated from compression test. These inspections are very useful to determine the variations in the bonding between the powder particles and the effect of compaction parameter on compression strength, Microhardness and microstructure. Four groups of particle size were selected which were (25, 63,100, mix of them) μm. The mechanical properties of the four groups depend on the variations in particle size for powder and the pores between particles. So, it is useful first to present and discuss the results of microstructure to understand the strengthening mechanism. In this study, compression strength value was increased with the increasing of compaction pressure value to (9) tons of all types of suggested groups. After that, it was gradually decreased. The maximum value of compression strength was detected by mix group which was (160) MPa while the particle siz...
International Journal of Material Forming
In this work, pure aluminium powders of different average particle size were compacted, sintered into discs and tested for mechanical strength at different strain rates. The effects of average particle size (15, 19, and 35 μm), sintering rate (5 and 20 °C/min) and sample indentation test speed (0.5, 0.7, and 1.0 mm/min) were examined. A compaction pressure of 332 MPa with a holding time of six minutes was used to produce the green compacted discs. The consolidated green specimens were sintered with a holding time of 4 h, a temperature of 600 °C in an argon atmosphere. The resulting sintered samples contained higher than 85% density. The mechanical properties and microstructure were characterized using indentation strength measurement tests and SEM analysis respectively. After sintering, the aluminium grain structure was observed to be of uniform size within the fractured samples. The indentation test measurements showed that for the same sintering rate, the 35 μm powder particle size provided the highest radial and tangential strength while the 15 μm powder provided the lowest strengths. Another important finding from this work was the increase in sintered sample strength which was achieved using the lower sinter heating rate, 5 °C/min. This resulted in a tangential stress value of 365 MPa which was significantly higher than achieved, 244 MPa, using the faster sintering heating rate, 20 °C/min.
Proceeding International Conference on Science (ICST), 2021
Products resulting from the powder metallurgy process are increasingly competitive because they have advantages in terms of their mechanical and physical properties. Material engineering by mixing several types of metal powders is possible. The composition of this powder metallurgy process material is a mixture of aluminum powder (80%), copper powder (15%) and silicon carbide powder (5%) by weight, and then the compaction is carried out with a pressure of 3, 4 and 5 metric tons gradually with heating temperature of 125 o C. Sintering in the furnace at temperature variations of 450 o C, 500 o C and 550 o C and the sintering time is 60 minutes. The tests carried out are the compressive strength test by the Universal Testing Machine (UTM) and the hardness test using the Rockwell method (HRF). The highest compressive strength of 120 MPa was obtained at sintering temperature of 450 o Cwith onestage compaction. In addition, the highest hardness of 80 HRF was obtained at sintering temperature of 450 o C with one-stage compaction. Multi stage compaction provides lower compressive strength and hardness than single-stage compaction (compressive strength of 110 MPa and hardness of 77 HRF at sintering temperature of 450 o C). The higher the sintering temperature, the lower the compressive strength and hardness of the specimen, both in singlestage and multi-stage compaction. Those, it can be concluded that the multi stage pressing method reduces mechanical properties and also requires a longer processing time.
This research were designed and created hot forging moulds of Aluminum alloys to investigate the effect of heating influence on machine qualifications of Aluminum alloys and know the suitable conditions of hot forging. The experimental variable was forging temperature and analyzed the experiment results for determined the suitable condition in hot forging on two types Aluminum alloysAlSi1Mg:Al6063 and AlZn5.5MgCuAl7075. The forming temperature were 300-500 °C and the work pieces was passed heat treatment process for improving microstructure by determined the forming ratio at 50 percent and used the machine which had efficiency about 400 ton. The results of the experimental revealed that the forming temperature effected to the force from Hot forging of Aluminum alloys Pre-heat temperature were higher value, done the forming force were lower and the forming temperature also effected to the material hardness. Aluminum alloys Al6063 had the highness value in forming; grain size of forging temperature at 300°C was 6.72 μm.
The effects of mechanical alloying on the compressibility of aluminium matrix composite powder
Materials Science and Engineering: A, 2003
High-energy milling changes the compressibility of powder material due to the work hardening effect and the changes in the powder morphology. Aluminium 6061 powder alloy reinforced with AlN was mechanically alloyed for different lengths of time and the compressibility of the obtained powder was determined. The results are explained in terms of the plastic deformation capacity of the powders, which is influenced by the hardness and the morphology of the powder. With increased milling time, powder compressibility is reduced. The equiaxed morphology of the as-received unreinforced aluminium powder also induces low compressibility, which is improved by the simple addition of reinforcement particles.
Investigating of Mechanical Behavior of AA5083 in the Pressing Process Using Finite Element Analysis
Modern Applied Science, 2017
The process of cold forming is considered of the most different industries and the use of such process in the manufacture of components and small parts has expanded. Therefore, analyzing the behavior of metals in this process to identify and control durability that is the main factor of limiting process has particular importance in industrial forming processes. In this study, cold forming process of aluminum metal has been studied and its effect on its mechanical properties has been evaluated. For this purpose, first modeling piece of aluminum alloy 5083 for cold forming process is carried out and using finite element analysis, mechanical properties of considered piece during cold forming processes are investigated. The results show that by reducing friction, stress and strain during the process will reduce, thereby durability of the piece increases, or in other words, ductile fracture occurs in longer life and higher stresses. The results show that by proper forming operations, it ...
Heat Treatment of Ultrafine Grained High Strength Aluminum Alloy
Key Engineering Materials Vol. 604 pp 273-276, 2014
Aluminum is one of the non-ferrous metals with very wide applications. It has specific properties such as being light weight, ductile and a lower melting point compared to many other common engineering materials. Consolidation by Equal Channel Angular Pressing (ECAP -Consolidation) is a manufacturing method to produce alloys with high strength by consolidation. ECAP method can produce a fine grain structure and combined with oxide inclusions from particle surfaces yielding in high strength. The present research will examine the applicability of ECAP to consolidate 7075 series Aluminum Alloy (AA7075) powders at 400 ⁰C under pressure of 400 MPa. The effects of heat treatment regimes on grain size of the ECAP samples are studied. The hardness of the 7075 alloy reaches 121 HV10 after ECAP process and decreases down to 105 HV10 after T6 heat treatment. Hardness further decreases after annealing process down to 99 HV10. Decline in hardness is accompanied with increased grain size and ductility Online available since 2014/Mar/12 at www.scientific.net © (2014) Trans Tech Publications, Switzerland
A statistical analysis was used to anticipate the influence of particles sizes and compaction pressure on surface hardness of aluminum composites after compacted in a rigid die under an uniaxial compaction. Al-20 wt.% slag powder mixtures with various particle sizes (38µm to 212µm) were prepared and their compressibility was studied in a wide range of compaction pressure up to 300 MPa. All of compacted specimens were sintered at 500 0 C for 2hrs. The surface hardness of each sintered specimens was measured by using Vikers Macrohardness. The outcomes of the statistical analysis are predicted by using linear or nonlinear correlation. A direct correlation between compaction pressure and surface hardness of composites was noticed. The correlation between particle sizes and surface hardness are in positive quadratic relationship. It can be concluded that the particle size and compaction pressure significantly influence the surface hardness of aluminum composite.
Fundamental Analysis of Cold Die Compaction of Reinforced Aluminum Powder
Aluminum Matrix Composites (AMCs) are used in many automotive and aerospace applications. The aluminum reinforced composites powder is compacted at room temperature or at elevated temperature according to the required properties of the product. In the present work, simple analytical model is used to elevate the green density as a function of the applied pressure in die compaction. Aspects die ratio as well as friction between wall and powder and powder itself are considered in the analysis. Experiments are performed on die compaction of Al-4Cu metal matrix composites. The results of the experimental finding are compared with the predicted results obtained from the simple model introduced.
Fundamental Analysis of Cold Die Compaction of Reinforced Aluminum Powder.pdf
Abstract— Aluminum Matrix Composites (AMCs) are used in many automotive and aerospace applications. The aluminum reinforced composites powder is compacted at room temperature or at elevated temperature according to the required properties of the product. In the present work, simple analytical model is used to elevate the green density as a function of the applied pressure in die compaction. Aspects die ratio as well as friction between wall and powder and powder itself are considered in the analysis. Experiments are performed on die compaction of Al-4Cu metal matrix composites. The results of the experimental finding are compared with the predicted results obtained from the simple model introduced.