By Tibor Kvackaj
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Additional resources for Aluminium Alloys, Theory and Applications
G. magnesium and copper, Figs. 11 and 12. Magnesium is mainly concentrated around the pores and in the necks volume. It appears that the primary porosity inside powder is also relatively permeable. The densification behaviour of powder particles in the examined alloy is complicated due to the large surface area and associated oxide layers. Formation of transient liquid phase, according to (Danninger & Gierl, 2001), enhances homogenization of the alloying element, mainly magnesium and copper, by accelerating material transport through spreading of the melt in the pore network and the pressing contacts and by increasing the diffusional cross-section.
2 Fracture and structure investigation The fracture surfaces analyses of investigated materials showed dominant of transcrystalline ductile fracture. , 2009). During plastic deformation, particles were cracked and/or particles were divided from interphase surface by means of cavity failure systems, which after that exhibited in the formerly dimples, Fig. 25 and Fig. 26. Detailed fractographical examinations revealed that there were two categories of dimples of transcrystalline ductile fracture: large dimples with average diameter in the range from 5 to 25 µm (arrow in Fig.
E. high tensile strength with adequate plasticity) should assure an increasing role for aluminium alloys in the expanding PM market. Room temperature tensile strengths in aluminium based metal matrix composites (MMC) in excess of 800 MPa have been reported (Guo & Kazama, 1997). However, PM based MMC currently show very limited application, also due to the high costs of production, thus having a low commercial appeal for both producers and end users. The application for aluminium powders is basically in the production of PM parts for structural and nonstructural purposes in the transportation and commercial areas.
Aluminium Alloys, Theory and Applications by Tibor Kvackaj