| Ti—48Al合金片层组织的连续粗化机制 |
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| 引用本文： | 曹春晓,李臻熙,孙福生. Ti—48Al合金片层组织的连续粗化机制[J]. 材料热处理学报, 2001, 22(1): 2-6 |
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| 作者姓名： | 曹春晓 李臻熙 孙福生 |
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| 作者单位： | 北京航空材料研究院, |
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| 基金项目： | 清华大学教育部先进材料开放研究实验室开放基金部分资助 |
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| 摘 要： | 研究了 115 0℃时效时Ti 48Al合金全片层组织的连续粗化机制。片层组织的连续粗化不仅能通过片层界面缺陷 (如台阶、端部、弯曲的界面等 )迁移来实现 ,而且可以通过γ/γ片层界面迁移或分解的方式来实现 ;在真孪晶、伪孪晶和 12 0°旋转有序型γ/γ界面当中 ,12 0°旋转有序界面的稳定性最低 ,最容易迁移或分解 ;γ片层内的 12 0°旋转有序畴界与片层界面的交汇处易形成热沟(thermalgroove) ,它往往成为片层界面发生分解的起始部位
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| 关 键 词： | TiAl合金 片层组织 连续粗化机制 时效 界面结构 |
| 文章编号： | 1009-6264(2001)01-0002-05 |
| 修稿时间： | 2000-07-17 |
Continuous Coarsening Mechanism of Lamellar Microstructure in Ti-48Al Alloy |
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| CAO Chunxiao,Li Zhenxi,Sun Fusheng. Continuous Coarsening Mechanism of Lamellar Microstructure in Ti-48Al Alloy[J]. Transactions of Materials and Heat Treatment, 2001, 22(1): 2-6 |
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| Authors: | CAO Chunxiao Li Zhenxi Sun Fusheng |
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| Abstract: | The continuous coarsening mechanism of the fully lamellar microstructure of Ti-48Al alloy aged at 1150℃ was studied by TEM. The continuous lamellar coarsening could be occurred not only by the interface faults (such as: ledges, edges and curved interfaces) migrating, but also by the migration and dissolution of γ/γ lamellar interfaces. Among the true-twin, pseudo-twin and 120°-rotational ordered types γ/γ lamellar interfaces, the thermal stability of the 120°-rotational ordered interface was the lowest, it was migrated or dissolved frequently. The thermal grooves were often formed at the triple point junctions between the 120°-rotational ordered domain boundaries in γ lamella and the lamellar interfaces, which was the original dissloution position of the lamellar interfaces. |
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| Keywords: | TiAl alloy lamellar microstructure continuous coarsening |
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