Wykorzystując metodę KOBO możliwe jest kształtowanie plastyczne wyrobów z odlewniczego stopu AZ91 (MgAl9Zn1) bez homogenizacji i wstępnego nagrzewania wsadu czyli w temperaturze pokojowej.
Polegająca na wyciskaniu przez obustronnie obracaną matrycę metoda KOBO pozwala na drastyczne zwiększenie właściwości mechanicznych (Rm, Rp0,2, A) w statycznej próbie rozciągania próbek odlewanych do formy piaskowej, do formy metalowej (kokili), metodą półciągłego odlewania oraz prasowania w stanie ciekłym (squeeze casting) - szczególnie w odniesieniu do stanu lanego.
Zwiększenie stopnia przerobu podczas wyciskania metodą KOBO istotnie podwyższa wytrzymałość i plastyczność odlewniczego stopu AZ91.
Podwyższenie częstotliwości obrotu matrycy wpływa na zmniejszenie wytrzymałości i twardości próbek, natomiast przyczynia się do wzrostu ich plastyczności.
Wyniki statycznej próby rozciągania zrealizowanej w temperaturze 300 i, 350°C dowiodły, że próbki odlewów piaskowych wyciskane w warunkach zmiany drogi deformacji (metoda KOBO) nabrały cechy materiałów nadplastycznych o wydłużeniu sięgającym nawet 577%.
Średnia wielkość ziarna w strukturze odlewu piaskowego wyciskanego metodą KOBO ze stopniem przerobu λ=44,4, który wykazywał cechy nadplastyczne zmierzona w przekroju porzecznym wyniosła 2,08μm.
Ewolucja struktury odlewanych wlewków, które wyciskano metodą KOBO obejmowała rozdrobnienie ziarn, efekt pasmowości polegający na wydłużeniu poszczególnych elementów struktury takich, jak roztwór stały, faza γ typu Mg17Al12, eutektyki i preeutektyki, skorelowanym z kierunkiem wyciskania, oraz obejmowała charakterystyczne zawirowania płynięcia pochodzące od cyklicznego skręcania wyciskanego stopu.
Wyciskanie metodą KOBO wywołało w stopie AZ91 daleko idące zmiany w morfologii fazy γ typu Mg17Al12 w postaci jej rozdrobnienia, usytuowania w pasmach i globularyzacji.
Część prac badawczych zrealizowano w ramach projektu: „Zastosowanie innowacyjnych rozwiązań techniczno-materiałowych w budowie pojazdów inwalidzkich RETECH UOD-DEM-1-255/001 oraz w ramach zadania nr V.6.1Projektu strukturalnego „Zaawansowane materiały i technologie ZAMAT” nr: POIG.01.01.02-00-015/09
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