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Dissertation
A parametric study of the evolution of microporosity in Al-Si foundry alloys
Doctor of Philosophy (Ph.D.), Drexel University
1992
DOI:
https://doi.org/10.17918/00007515
Abstract
Experimental data has been collected over a wide range of alloying and processing conditions in A356 alloy. A multiple regression analysis has been performed to correlate the casting parameters to the size and quantity of microporosity observed in the samples. It has been found that the hydrogen content had the strongest influence on microporosity, and that both local solidification time and the local thermal conditions in the casting contributed to the final amount, size and shape of the pores. A hypothesis has been proposed which suggests that the pore growth is diffusion controlled. Factors that influenced the pore nucleation conditions, e.g. oxide inclusions and strontium content, have also been found to be important to the porosity. The relations describing pore size and total fraction porosity have shown quantitative differences. Finally, previous assumptions used for modeling of porosity have been critically evaluated, and an outline for a new approach to mathematical modeling has been established.
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Details
- Title
- A parametric study of the evolution of microporosity in Al-Si foundry alloys
- Creators
- Karin Elisabeth Tynelius
- Contributors
- Diran Apelian (Advisor) - Drexel University, Drexel University (1970-)James Frederick Major (Advisor) - Drexel University, Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xvi, 210 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888962004721