Effect Of SiC Particles On Sinterability Of Al-Zn-Mg-Cu P/M Alloy

Abstract

Premix Al-5.5Zn-2.5Mg-0.5Cu alloy powder was analyzed as matrix in this research. Gas atomized powder Al-9Si with 20% volume fraction of SiC particles was used as reinforcement and added into the alloy with varied concentration. Mix powders were compacted by dual action press with compaction pressure of 700 MPa. High volume fraction of SiC particles gave lower green density due to resistance of SiC particles to plastic deformation during compaction process and resulted voids between particles and this might reduce sinterability of this mix powder. Sintering was carried out under ultra high purity nitrogen gas from 565• -580• C for 1 hour. High content of premix Al-5.5Zn-2.5Mg-0.5Cu alloy powder gave better sintering density and reached up to 98% relative. Void between particles, oxide layer on aluminum powder and lower wettability between matrix and reinforcement particles lead to uncompleted liquid phase sintering, and resulted on lower sintering density and mechanical properties on powder with high content of SiC particles. Mix powder with wt90% of Alumix 431D and wt10% of Al-9Si-vf20SiC powder gave higher tensile strength compare to another mix powder for 270 MPa. From chemical compositions, sintering precipitates might form after sintering such as MgZn 2 , CuAl 2 and Mg 2 Si. X-ray diffraction, DSC-TGA, and SEM were used to characterize these materials.

Effect of Ultrasonication Dispersion Technique on Sintering Properties of CNT Reinforced Al-Zn-Mg-Cu Powder

“…Sn seems to be impurity which added by manufacturer, as it also appears from another results Fig. 4 [7].…”

“…2 Lubricant is supposed to be removed before reaching sintering temperature otherwise, it can hinder diffusion process between elements during sintering. 580 o C sintering temperature was chosen because at that temperature, this alloy powder is able to form optimum liquid phase to be able to achieve optimum sintering density without formation of particle coarsening as shown by previous results [7]. Fig.…”

Pressure Influence on the Thermophysical Properties of 316L Austenitic Stainless Steels Manufactured By Powder Metallurgy Method

“…The SEM image and particle size distribution of 316L austenitic stainless steel powder were showed in Figure 2. According to SEM image of this powder; particle size of powder has irregular shape that type of water atomized particle and particle size distribution of this powder showed the positively skewed particle size distribution due to mostly fine particles into the alloy [13][14][15]. Figure 2.…”

The Physical Properties Of Aluminium-7xxx Series Alloys Produced By Powder Metallurgy Method

“…It was appeared that an equixed grains and two types with apparent origins, the first generated at the grain boundaries during the solidification process caused to segregation of the alloying elements when the second phase is widely formed near the grain boundaries. Many coarse precipitates are distinct within the constituted grains [36]. …”

“…593 K) and observed in roughly constant. It was considered to such a tendency is attributed to a falling offset of EF (Fermi Energy) from the valley of the pseudo-gap because of motion of EF to the location with larger density of states (DOS) causing to the reducing in the electrical resistivity magnitude and also considered [36,37] in Figure 5. Maximum electrical resistivity is obtained in value of 16.1x10 -2 Ω.m at about 299K for Alumix-431-1 specimen.…”