This article presents a study of the crystallization and microstructure of the AlSi9 alloy (EN AC-AlSi9) used for the alfin processing of iron ring supports in castings of silumin pistons. Alfin processing in brief is based on submerging an iron casting in an Al-Si bath, maintaining it there for a defined time period, placing it in a chill mould casting machine and immersing it in the alloy. This technology is used for iron ring supports in the pistons of internal combustion engines, among others. Thermal analysis shows that when the AlSi9 alloy contains a minimal content of iron, nucleation and increase in the triple α (Al)+Fe+(Si) eutectic containing the α -Al8Fe2Si phase takes place at the end of the crystallization of the double α (Al)+ß(Si) eutectic. Due to the morphology of the ”Chinese script” the -Al8Fe2Si phase is beneficial and does not reduce the alloy’s brittleness. After approx. 5 hours of alfin processing, the -Al5FeSi phase crystallizes as a component of the α+Al5FeSi+(Si) eutectic. Its disadvantageous morphology is ”platelike” with sharp corners, and in a microsection of the surface, ”needles” with pointed corners are visible, with increases the fragility of the AlSi9 alloys.
The objective of the study was to examine, how some physical factors and inoculation techniques affect the growth and sporulation of three insecticidal fungal strains, Hirsutella tompsonii, Paecilomycessp., and Pandorasp. Although the methods of inoculation, as well as such physical parameters as temperature, the osmotic value of the habitat and UV radiation, exerted an influence on the above-mentioned features of the fungi, their contribution varied from one strain to another. Some of the effects, however (e.g., the production of filamentous structures by Pandora, or the lethal action of glycerol on Pandora), require a close examination.
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Przetestowano wpływ wybranych czynników fizycznych oraz technik posiewu na wzrost i zarodnikowanie szczepów trzech gatunków grzybów owadobójczych: Hirsutella tompsonii, Paecilomyces sp. i Pandorasp. Zarówno technika posiewu, jak i czynniki takie jak temperatura, wartość osmotyczna środowiska, promieniowanie UV wpływają na wymienione cechy tych grzybów, chociaż wpływ ten jest różny w stosunku do poszczególnych szczepów. Niektóre uzyskane efekty, np. wytwarzanie przez Pandorasznurowatych struktur, czy letalny wpływ glicerolu w stosunku do Pandora,powiny być poddane bardziej szczegółowym badaniom w przyszłości.