Effect of Sintering Temperature on Aluminium Chip Recycling (Al7075) by Powder Metallurgy Process

Al7075 was recycled using the powder metallurgy technique to determine the effect of particle size distribution on the mechanical and microstructure of materials. Analysis of the microstructure, green density and microhardness was conducted to evaluate the performance of the recycled aluminium. The Al7075 was added with 4% of alumina and Al2O3 (3-4μm). The results showed that the green density of recycled Al7075 was lower than the pure Al7075. The average size distribution of the aluminium powder decreased with the increase in the ball mill time. As the temperature of sintering process increased, the green density decreased. The alloy’s microstructure sintered at 650°C has the lowest density, indicating a larger and more frequent porosity. The hardness of the samples with the addition of alumina was higher than the samples without the alumina. Sintering at 650°C also caused the hardness of the sample to increase in the range of approximately 50-62 Hv.

Download Full-text

Development of Gradient Concentrated Single-Phase Fine Mg-Zn Particles and Effect on Structure and Mechanical Properties

Journal of Engineering Materials and Technology ◽

10.1115/1.4041865 ◽

2018 ◽

Vol 141 (2) ◽

Cited By ~ 3

Author(s):

S. Fida Hassan ◽

O. Siddiqui ◽

M. F. Ahmed ◽

A. I. Al Nawwah

Keyword(s):

Solid Solution ◽

Powder Metallurgy ◽

Solution Structure ◽

Single Phase ◽

Zinc Alloy ◽

Sintering Process ◽

Phase Gradient ◽

Alloy Particles ◽

Powder Metallurgy Process ◽

Metallurgy Process

In this study, we used powder metallurgy process to develop gradient concentrated single-phase fine magnesium–zinc alloy particles. Fine magnesium particles were initially dry coated with nanometer size zinc particles in homogeneous manner and cold compacted to cylindrical billet. Zinc atoms were diffused in to the magnesium particles during high-temperature sintering process and produced the single-phase gradient solid solution. The gradient concentration of zinc induced gradual grain refinement in the magnesium particles. The powder metallurgy processed gradient concentrated alloy particles showed an excellent level of hardness, strength, ductility, and fracture toughness in their bulk form, which was even much higher when compared with unalloyed magnesium. Despite having gradient solid solution structure, the developed alloy particles showed homogeneous properties in their bulk form.

Download Full-text

The Effect of Different Composition of Stainless Steel (SS316L) Foam via Space Holder Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1133.310 ◽

2016 ◽

Vol 1133 ◽

pp. 310-313 ◽

Cited By ~ 1

Author(s):

Murni Faridah Mahammad Rafter ◽

Sufizar Ahmad ◽

Rosdi Ibrahim

Keyword(s):

Stainless Steel ◽

Powder Metallurgy ◽

Sintering Process ◽

Wear Performance ◽

Space Holder ◽

Powder Metallurgy Process ◽

Lower Porosity ◽

Steel Foam ◽

Cold Pressed ◽

Metallurgy Process

Stainless Steel materials (SS316L) generally known as a highly wear performance and resistant to corrosion. The purpose in this study is to produce the stainless steel foam and physical properties of sintered 316L stainless steel materials produced by powder metallurgy (P/M) method. In this paper, the method is based on using spherical urea as space holder was investigated. Then, the foams will be given to consider the properties of SS316L foam after sintering process. Powder metallurgy process needs to go through the mixing, pressing, sintering and analysis. The selected compositions of SS316L were varied from 50 wt % to 60 wt % SS316L, respectively while the remaining percentages are foaming agent. The SS316L powders were cold-pressed with 8 tons pressure and sintered at 1200°C via tube furnace. The SS316L foams were then characterised using Scanning Electron Microscopy (SEM) for morphological characterisation of the samples after sintering process. Lastly, porosity and density were tested for this sample. As a result, the composition with 60 wt % SS316L is provided higher bulk density and lower porosity which are 4.34 g/cm3 and 69.03 %, respectively.

Download Full-text

Hardness, Density and Porosity of Al/(SiCw+Al2O3p) Composite by Powder Metallurgy Process without and with Sintering

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.776.246 ◽

2015 ◽

Vol 776 ◽

pp. 246-252 ◽

Cited By ~ 1

Author(s):

Ketut Suarsana ◽

Rudy Soenoko

Keyword(s):

Powder Metallurgy ◽

Test Specimen ◽

Sintering Temperature ◽

Physical And Mechanical Properties ◽

Sem Analysis ◽

Holding Time ◽

Sintering Process ◽

Interface Bonding ◽

Powder Metallurgy Process ◽

Metallurgy Process

Al/(SiCw+Al2O3p) composite was a blend of fine aluminum powder serving as a matrix while Silicon Carbid whiskers (SiCw) and Alumina (Al2O3p) as a reinforcement. Powder metallurgy was used for the manufacture of composites according to the shape of the test specimen. Parameter testing was conducted with varied sintering holding time of 1 h, 3 h and 6 h at a sintering temperature of 500°C and 600°C. This study was conducted to know hardness properties, density, porosity and SEM analysis. The results show that the sintering process which has been conducted affects the physical and mechanical properties of the composite. Increased hardness and density occur due to the stronger or more dense interface bonding between matrix and reinforcement which are affected by the increase in the holding time and sintering temprature, where the highest is at 6 hours with 600°C, while the porosity decreases inversely proportional to the density and the hardness that occur in composite materials.

Download Full-text