AgSnBi powder consolidated by composite mode of deformation

• Autorzy: Richert, M. , Richert, J. , Leszczyńska-Madej, B. , Hotloś, A. , Maślanka, M. , Pachla, W. , Skiba, J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The objective of this work present the characterization of microstructure and properties of consolidated powder AgSn7.5Bi0.5 by using composition of cyclic extrusion compression (CEC) and hydrostatic extrusion (HE) methods. As the final product the wires of 3 mm in diameter were obtained. The comparison of powder properties after CEC deformation and after the combined deformation CEC and HE is presented. Design/methodology/approach: The investigated samples contained consolidated by large plastic deformations particles of AgSnBi. The samples were deformed by the CEC method in the range of true strains = 0.32 up to .= 25.2 and then additionally were extruded to . = 1.85. The systematic observations by optical microscopy were performed for determination of the quality of particle joints. The microstructure was observed by optical, scanning and transmission electron microscopy. Microhardness was measured and areas around indentations of microhardness penetrator were observed. This allows evaluated resistance of consolidated material against local cracking under the penetrator load. Findings: Microstructure of consolidated AgSnBi powder was finding at the cross sections of samples as consisting from almost equiaxial grains, which size decreasing with the increasing of plastic deformations. The microhardness of samples strongly increase in the few first cycles (to about . = 2 of CEC) and then keeps almost the same level of about žHV = 107 - 111 to the strain of about .= 25. Inside the consolidated granules subgrains/grains with the average size of about 77 nm, after the . = 25, were found. Research limitations/implications: This paper presents results for one alloy - MC MgAl3Zn1 only, cooled with three different solidifications rate i.e. 0.6, 1.2 and 2.4°C/s, for assessment for the liquidus and solidus temperatures and its influence on the mechanical properties and structure. Practical implications: The parameters described can be applied in metal casting industry for selecting magnesium ingot preheating temperature for semi solid processing to achieve requirements properties. Originality/value: The paper contributes to better understanding and recognition an influence of different solidification condition on non-equilibrium thermal parameters of magnesium alloys.

Słowa kluczowe

PL

obróbka cieplna; stop magnezowy; właściwości mechaniczne

EN

thermal treatment; magnesium alloy; mechanical properties

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 39, nr 2
• Strony: 161-167
• Opis fizyczny: Bibliogr. 17 poz., rys., tabl.

Twórcy

autor

Richert, M.

autor

Richert, J.

autor

Leszczyńska-Madej, B.

autor

Hotloś, A.

autor

Maślanka, M.

autor

Pachla, W.

autor

Skiba, J.

• Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland,

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