Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys
Phase field method was used to simulate the effect of grains orientation angle θ11 and azimuth θA of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites. In the simulation process, two single-factor influence experiments were designed for columnar cr...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Foundry Journal Agency
2019-04-01
|
| Series: | China Foundry |
| Subjects: | |
| Online Access: | http://ff.foundryworld.com/uploadfile/2019040233630765.pdf |
| _version_ | 1818444570467237888 |
|---|---|
| author | Li Feng Ni-ni Lu Ya-long Gao |
| author_facet | Li Feng Ni-ni Lu Ya-long Gao |
| author_sort | Li Feng |
| collection | DOAJ |
| description | Phase field method was used to simulate the effect of grains orientation angle θ11 and azimuth θA
of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites. In the
simulation process, two single-factor influence experiments were designed for columnar crystal structures. The
simulation results showed that, when θ11 < 45º and θA < 45º, as θ11 was enlarged, the growth direction of the
secondary dendrites on the preferentially growing dendrites at the converging grain boundary (GB) presented
an increasing inclination to that of preferentially growing dendrites; with increasing θA, the growth direction of the
secondary dendrites on the preferentially growing dendrites at the converging GB exhibited greater deflection,
and the secondary dendrites grew with branches; the secondary dendrites on the preferentially growing dendrites
at diverging GBs grew along a direction vertical to the growth direction of the preferentially growing dendrites.
When θA = 45º and θ11 = 45º, the secondary dendrites grew in a direction vertical to the growth direction of
preferentially growing dendrites. The morphologies of the dendrites obtained through simulation can also be
found in metallographs of practical solidification experiments. This implies that the effect of a grain’s orientation
angle and azimuth of non-preferentially growing dendrites on the secondary dendrites of preferentially growing
dendrites does exist and frequently appears in the practical solidification process. |
| first_indexed | 2024-12-14T19:18:02Z |
| format | Article |
| id | doaj.art-c30075db62694f6aa9703571d3dab0a9 |
| institution | Directory Open Access Journal |
| issn | 1672-6421 1672-6421 |
| language | English |
| last_indexed | 2024-12-14T19:18:02Z |
| publishDate | 2019-04-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-c30075db62694f6aa9703571d3dab0a92022-12-21T22:50:29ZengFoundry Journal AgencyChina Foundry1672-64211672-64212019-04-011629710410.1007/s41230-019-8126-6Phase-field simulation of secondary dendrite growth in directional solidification of binary alloysLi Feng0Ni-ni Lu1Ya-long Gao2College of Materials and Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaCollege of Materials and Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaCollege of Materials and Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaPhase field method was used to simulate the effect of grains orientation angle θ11 and azimuth θA of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites. In the simulation process, two single-factor influence experiments were designed for columnar crystal structures. The simulation results showed that, when θ11 < 45º and θA < 45º, as θ11 was enlarged, the growth direction of the secondary dendrites on the preferentially growing dendrites at the converging grain boundary (GB) presented an increasing inclination to that of preferentially growing dendrites; with increasing θA, the growth direction of the secondary dendrites on the preferentially growing dendrites at the converging GB exhibited greater deflection, and the secondary dendrites grew with branches; the secondary dendrites on the preferentially growing dendrites at diverging GBs grew along a direction vertical to the growth direction of the preferentially growing dendrites. When θA = 45º and θ11 = 45º, the secondary dendrites grew in a direction vertical to the growth direction of preferentially growing dendrites. The morphologies of the dendrites obtained through simulation can also be found in metallographs of practical solidification experiments. This implies that the effect of a grain’s orientation angle and azimuth of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites does exist and frequently appears in the practical solidification process.http://ff.foundryworld.com/uploadfile/2019040233630765.pdfphase-field methodbinary alloydirectional solidificationsecondary dendrites |
| spellingShingle | Li Feng Ni-ni Lu Ya-long Gao Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys China Foundry phase-field method binary alloy directional solidification secondary dendrites |
| title | Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys |
| title_full | Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys |
| title_fullStr | Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys |
| title_full_unstemmed | Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys |
| title_short | Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys |
| title_sort | phase field simulation of secondary dendrite growth in directional solidification of binary alloys |
| topic | phase-field method binary alloy directional solidification secondary dendrites |
| url | http://ff.foundryworld.com/uploadfile/2019040233630765.pdf |
| work_keys_str_mv | AT lifeng phasefieldsimulationofsecondarydendritegrowthindirectionalsolidificationofbinaryalloys AT ninilu phasefieldsimulationofsecondarydendritegrowthindirectionalsolidificationofbinaryalloys AT yalonggao phasefieldsimulationofsecondarydendritegrowthindirectionalsolidificationofbinaryalloys |