Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior
In the process of directional solidification, the degree of element segregation can be changed by altering the drawing rate to affect the phase transformation behavior of the alloy. In this paper, four kinds of MnNi alloy specimens were prepared by directional solidification at different drawing rat...
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| Format: | Article |
| Language: | zho |
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Journal of Aeronautical Materials
2022-10-01
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| Series: | Journal of Aeronautical Materials |
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| Online Access: | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2022.000032 |
| _version_ | 1818016535465164800 |
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| author | WANG Diwei NIU Hongkang TIAN Qingchao |
| author_facet | WANG Diwei NIU Hongkang TIAN Qingchao |
| author_sort | WANG Diwei |
| collection | DOAJ |
| description | In the process of directional solidification, the degree of element segregation can be changed by altering the drawing rate to affect the phase transformation behavior of the alloy. In this paper, four kinds of MnNi alloy specimens were prepared by directional solidification at different drawing rates. The phase transformation behavior of the alloy was studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD), thermal expansion analysis and dynamic mechanical analysis (DMA). The microstructure of the alloy was observed by metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the microstructure of directionally solidified MnNi alloy has the characteristics of polymorphy. There are multi-scale twins from micron to nanometer in the alloy, and their coordinated movement makes the internal friction of twins 3-6 times than that of rolled alloy. It is found that during heating, the alloy undergoes fct1→fcc phase transformation in the interdendritic spacings of Mn-poor region while fct2→fco→fcc multi-stage phase transformation occurs in Mn-rich dendrite. This multiply phase transformation behavior makes the damping capacity of directionally solidified MnNi alloy 2-6 times than that of rolled MnNi alloy in a wide temperature range. |
| first_indexed | 2024-04-14T07:13:43Z |
| format | Article |
| id | doaj.art-93745187850f4ace8efa70221ada7ffd |
| institution | Directory Open Access Journal |
| issn | 1005-5053 |
| language | zho |
| last_indexed | 2024-04-14T07:13:43Z |
| publishDate | 2022-10-01 |
| publisher | Journal of Aeronautical Materials |
| record_format | Article |
| series | Journal of Aeronautical Materials |
| spelling | doaj.art-93745187850f4ace8efa70221ada7ffd2022-12-22T02:06:21ZzhoJournal of Aeronautical MaterialsJournal of Aeronautical Materials1005-50532022-10-01425819010.11868/j.issn.1005-5053.2022.000032a2022-0032Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behaviorWANG Diwei0NIU Hongkang1TIAN Qingchao2State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200444, ChinaState Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200444, ChinaState Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200444, ChinaIn the process of directional solidification, the degree of element segregation can be changed by altering the drawing rate to affect the phase transformation behavior of the alloy. In this paper, four kinds of MnNi alloy specimens were prepared by directional solidification at different drawing rates. The phase transformation behavior of the alloy was studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD), thermal expansion analysis and dynamic mechanical analysis (DMA). The microstructure of the alloy was observed by metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the microstructure of directionally solidified MnNi alloy has the characteristics of polymorphy. There are multi-scale twins from micron to nanometer in the alloy, and their coordinated movement makes the internal friction of twins 3-6 times than that of rolled alloy. It is found that during heating, the alloy undergoes fct1→fcc phase transformation in the interdendritic spacings of Mn-poor region while fct2→fco→fcc multi-stage phase transformation occurs in Mn-rich dendrite. This multiply phase transformation behavior makes the damping capacity of directionally solidified MnNi alloy 2-6 times than that of rolled MnNi alloy in a wide temperature range.http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2022.000032mnni damping alloydirectional solidificationphase transformationtwin microstructure |
| spellingShingle | WANG Diwei NIU Hongkang TIAN Qingchao Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior Journal of Aeronautical Materials mnni damping alloy directional solidification phase transformation twin microstructure |
| title | Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior |
| title_full | Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior |
| title_fullStr | Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior |
| title_full_unstemmed | Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior |
| title_short | Damping characteristics of directionally solidified MnNi alloy exhibiting multiply phase-transformation behavior |
| title_sort | damping characteristics of directionally solidified mnni alloy exhibiting multiply phase transformation behavior |
| topic | mnni damping alloy directional solidification phase transformation twin microstructure |
| url | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2022.000032 |
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