ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
In this study, in order to compare effect of unidirectional compression and rolling onfinal microstructure of strain induced melt activated (SIMA) A356 aluminum alloy, rectangularsamples with dimensions of 3cm×5cm in area and 1cm in thickness and cylindrical specimens with2.5cm in diameter and 1cm in length, have been prepared for rolling and compressing processes,respectively. Then, these samples were plastically deformed at a same strain in ambienttemperature. Afterward, the strained samples were cut into equal quarters. In the next stage, toproduce globular microstructure, these specimens were partially remelted in 580°C for differenttimes. Results obtained from light microscopy showed that specimen's thickness and so, its strainaffected zones influence on the globulization of dendrites. In addition, it was seen that at a givenstrain and constant diameter, increase of H/D ratio led to increase of needed time for reaching acertain sphericity in cylindrical samples. Also, it was showed that microstructural evolutions duringSIMA processing of both rolled and unidirectional compressed samples were relatively identical.However, at a same condition, ultimate size of globulized dendrites in the rolled samples wassmaller than those of compressed ones
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.391.pdf
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