The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality
The solubility of hydrogen in liquid and solid aluminum is reviewed. Based on classical nucleation theory, it is shown that pores cannot nucleate either homogeneously or heterogeneously in liquid aluminum. Results of in situ studies on pore formation show that pores appear at low hydrogen supersatur...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/3/368 |
| _version_ | 1819170203739619328 |
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| author | Murat Tiryakioğlu |
| author_facet | Murat Tiryakioğlu |
| author_sort | Murat Tiryakioğlu |
| collection | DOAJ |
| description | The solubility of hydrogen in liquid and solid aluminum is reviewed. Based on classical nucleation theory, it is shown that pores cannot nucleate either homogeneously or heterogeneously in liquid aluminum. Results of in situ studies on pore formation show that pores appear at low hydrogen supersaturation levels, bypassing nucleation completely. The results are explained based on the bifilm theory introduced by Prof. John Campbell, as this theory is currently the most appropriate, and most likely, the only mechanism for pores to form. Examples for the effect of hydrogen on pore formation are given by using extreme data from the literature. It is concluded that a fundamental change in how hydrogen is viewed is needed in aluminum casting industry. |
| first_indexed | 2024-12-22T19:31:40Z |
| format | Article |
| id | doaj.art-a88f9c8450c24fba97c415ce884d76b8 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T19:31:40Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-a88f9c8450c24fba97c415ce884d76b82022-12-21T18:15:05ZengMDPI AGMetals2075-47012020-03-0110336810.3390/met10030368met10030368The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus RealityMurat Tiryakioğlu0Jacksonville University; Jacksonville, FL 32211, USAThe solubility of hydrogen in liquid and solid aluminum is reviewed. Based on classical nucleation theory, it is shown that pores cannot nucleate either homogeneously or heterogeneously in liquid aluminum. Results of in situ studies on pore formation show that pores appear at low hydrogen supersaturation levels, bypassing nucleation completely. The results are explained based on the bifilm theory introduced by Prof. John Campbell, as this theory is currently the most appropriate, and most likely, the only mechanism for pores to form. Examples for the effect of hydrogen on pore formation are given by using extreme data from the literature. It is concluded that a fundamental change in how hydrogen is viewed is needed in aluminum casting industry.https://www.mdpi.com/2075-4701/10/3/368supersaturationfracture pressurenucleationbifilm theoryjohn campbell |
| spellingShingle | Murat Tiryakioğlu The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality Metals supersaturation fracture pressure nucleation bifilm theory john campbell |
| title | The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality |
| title_full | The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality |
| title_fullStr | The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality |
| title_full_unstemmed | The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality |
| title_short | The Effect of Hydrogen on Pore Formation in Aluminum Alloy Castings: Myth Versus Reality |
| title_sort | effect of hydrogen on pore formation in aluminum alloy castings myth versus reality |
| topic | supersaturation fracture pressure nucleation bifilm theory john campbell |
| url | https://www.mdpi.com/2075-4701/10/3/368 |
| work_keys_str_mv | AT murattiryakioglu theeffectofhydrogenonporeformationinaluminumalloycastingsmythversusreality AT murattiryakioglu effectofhydrogenonporeformationinaluminumalloycastingsmythversusreality |