DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION
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Cleveland State University / OhioLINK
2020
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=csu1596820774241624 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-csu15968207742416242021-08-03T07:16:12Z DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION Khan, Shirin A. Chemical Engineering Under a NASA (National Aeronautics and Space Administration)-ESA (European Space Agency) collaborative research project, MICAST (Microstructure formation in the casting of technical alloys under diffusive and magnetically controlled convection conditions), three Al-7wt% Si samples (MICAST-6, MICAST-7 and MICAST2-12) were directionally solidified at growth speeds varying from 10 to 50 m s-1 aboard the International Space Station to determine the effect of mitigating convection on the primary dendrite array. The purpose of this research is to examine the ordering in the pattern formation during dendritic array growth of binary metallic alloys and explore if natural convection affects the extent of the disorder. Contrary to the expectations the MICAST samples also show some defects, such as misoriented primary dendrites or macrosegregation usually attributed to natural convection. It is observed that all of the primary dendrites on a cross-section do not have identical shape and morphology. Natural convection during terrestrial growth introduces more scatter in their morphology and distribution. Fast Fourier Transform analysis of the transverse images should be investigated as another tool to quantitatively determine the extent of disorder in the mushy-sone introduced by natural convection. 2020-08-27 English text Cleveland State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=csu1596820774241624 http://rave.ohiolink.edu/etdc/view?acc_num=csu1596820774241624 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemical Engineering |
| spellingShingle |
Chemical Engineering Khan, Shirin A. DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION |
| author |
Khan, Shirin A. |
| author_facet |
Khan, Shirin A. |
| author_sort |
Khan, Shirin A. |
| title |
DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION |
| title_short |
DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION |
| title_full |
DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION |
| title_fullStr |
DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION |
| title_full_unstemmed |
DEFECT AND DISORDER IN DENDRITIC ARRAYS SOLIDIFIED ON EARTH AND ON THE SPACE STATION |
| title_sort |
defect and disorder in dendritic arrays solidified on earth and on the space station |
| publisher |
Cleveland State University / OhioLINK |
| publishDate |
2020 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=csu1596820774241624 |
| work_keys_str_mv |
AT khanshirina defectanddisorderindendriticarrayssolidifiedonearthandonthespacestation |
| _version_ |
1719457923246063616 |