Particles and powders; Plastic deformation; Scanning electron microscopy; Zinc-aluminium alloys Compression testing; Density (specific gravity); Ductility; Hardness; Metallographic microstructure; Plastic deformation; Scanning electron microscopy; Sintering; Strain rate; Zinc powder metallurgy; Rockwell hardness; Zinc alloys
Compression ductility of Zn-21 Al-2Cu prepared by powder metallurgy techniques
The microstructure and mechanical properties of room temperature-pressed specimens of Zinalco alloy (Zn-21Al-2Cu), prepared by powder metallurgy techniques, were evaluated. Cylinders of milled zinalco powder, with a particle size of 40-90 μm, were prepared under an average pressure of 580 MPa at room temperature. The density of zinalco green compacts was 5 %2b 0.02 g/cm3. This value remained almost without change after sintering. The Rockwell 'f' hardness of zinalco green compacts was 33 Rf. This value increased up to 46 Rf during the first 10 h of sintering. After this period, hardness remained almost constant. Green compacts behave plastically when tested under compression by varying the strain rates between 10-3 and 10-1 s-1. This material reached deformations as high as 113/. Compacts that were sintered for 20 h at 473 K in air fracture at much lower deformations. © 1998 Elsevier Science Ltd. All rights reserved.
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Generically Dependent Continuant
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