Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys
The microstructure, and phase selections of La₆₆Al₁₄(Cu, Ni)₂₀ alloy were studied by Bridgman solidifications, and composite materials of dendrites in amorphous matrix or micro- and nano- sized eutectic matrix were formed with differe...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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2003
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| Online Access: | http://hdl.handle.net/1721.1/3824 |
| _version_ | 1826201270834167808 |
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| author | Zhang, Yong Lee, Irene Mei Ling Tan, Hao Jing, Qin Li, Yi |
| author_facet | Zhang, Yong Lee, Irene Mei Ling Tan, Hao Jing, Qin Li, Yi |
| author_sort | Zhang, Yong |
| collection | MIT |
| description | The microstructure, and phase selections of La₆₆Al₁₄(Cu, Ni)₂₀ alloy were studied by Bridgman solidifications, and composite materials of dendrites in amorphous matrix or micro- and nano- sized eutectic matrix were formed with different cooling rates. The volume fraction of the dendrite phase reaches a maximum at the cooling rate of about 15 K/s, the secondary dendrite arm spacing λ₂ decreases from 4.3 µm to 0.6 µm with the increasing of cooling rate R, and obeys the equation of λ₂R⁰.⁵⁷=1.74µm(K/s)R⁰.⁵⁷. The compression strength, as well as the elastic strain limit of the dendrite/amorphous matrix composite are 600 MPa, and 2.3%, respectively. Improved ductility was observed for the dendrite amorphous matrix composites with more dendrite phase by slow cooling rate. |
| first_indexed | 2024-09-23T11:48:59Z |
| format | Article |
| id | mit-1721.1/3824 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:48:59Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | mit-1721.1/38242019-04-11T08:44:09Z Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys Zhang, Yong Lee, Irene Mei Ling Tan, Hao Jing, Qin Li, Yi Bridgman solidification bulk metallic glass eutectic La-based alloy The microstructure, and phase selections of La₆₆Al₁₄(Cu, Ni)₂₀ alloy were studied by Bridgman solidifications, and composite materials of dendrites in amorphous matrix or micro- and nano- sized eutectic matrix were formed with different cooling rates. The volume fraction of the dendrite phase reaches a maximum at the cooling rate of about 15 K/s, the secondary dendrite arm spacing λ₂ decreases from 4.3 µm to 0.6 µm with the increasing of cooling rate R, and obeys the equation of λ₂R⁰.⁵⁷=1.74µm(K/s)R⁰.⁵⁷. The compression strength, as well as the elastic strain limit of the dendrite/amorphous matrix composite are 600 MPa, and 2.3%, respectively. Improved ductility was observed for the dendrite amorphous matrix composites with more dendrite phase by slow cooling rate. Singapore-MIT Alliance (SMA) 2003-12-13T16:21:24Z 2003-12-13T16:21:24Z 2004-01 Article http://hdl.handle.net/1721.1/3824 en_US Advanced Materials for Micro- and Nano-Systems (AMMNS); 619745 bytes application/pdf application/pdf |
| spellingShingle | Bridgman solidification bulk metallic glass eutectic La-based alloy Zhang, Yong Lee, Irene Mei Ling Tan, Hao Jing, Qin Li, Yi Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys |
| title | Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys |
| title_full | Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys |
| title_fullStr | Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys |
| title_full_unstemmed | Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys |
| title_short | Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys |
| title_sort | effect of microstructure changes on mechanical properties of la x2086 x2086 al x2081 x2084 cu ni x2082 x2080 amorphous and crystalline alloys |
| topic | Bridgman solidification bulk metallic glass eutectic La-based alloy |
| url | http://hdl.handle.net/1721.1/3824 |
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