| Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy | |
| Jin Hao1,2; Jia Qing1; Liu Ronghua1; Xian Quangang1; Cui Yuyou1; Xu Dongsheng1; Yang Rui1 | |
| Corresponding Author | Yang Rui(ryang@imr.ac.cn) |
| 2019-12-11 | |
| Source Publication | ACTA METALLURGICA SINICA
 |
| ISSN | 0412-1961 |
| Volume | 55Issue:12Pages:1519-1526 |
| Abstract | Button ingots were prepared by arc melting and feed bars for directional solidification were prepared by optimized drop casting technique. The Ti-43Al-3Si directionally solidified bars with lamellar boundaries perpendicular to the growth direction were prepared at the growth rate of 180 mm/h in an optical floating zone furnace. Cylindrical sections were cut from these perpendicular lamellae with appropriate direction and then fixed on polycrystalline TiAl bars by mechanical setting method to serve as the initial seeds. The ultimate Ti-43Al-3Si seeds with parallel lamellar microstructure were successfully prepared from these initial seeds at the growth rate of 5 mm/h. To avoid the nucleation of stray grains, drop-cast bars with the shape of frustum of a cone were used for the preparation of ultimate seeds. At the growth rates of 5 and 180 mm/h, the primary phase of Ti-43Al-3Si alloy was always the a phase. Polysynthetically twinned (PST) crystals of Ti-47Al alloy were obtained from the Ti-43Al-3Si ultimate seeds and the seeding process was studied by microscopic analysis. Lamellar microstructure of the seed kept stable and recrystallization of the seed was not found. Lamellar orientation of Ti-47Al PST crystals was successfully controlled by the ultimate Ti-43Al-3Si seed. |
| Keyword | TiAl alloy polysynthetically twinned crystal seed technique directional solidification optical floating zone furnace |
| Funding Organization | National Natural Science Foundation of China |
| DOI | 10.11900/0412.1961.2019.00138 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51701209] |
| WOS Research Area | Metallurgy & Metallurgical Engineering |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000497774900005 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/136050 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Yang Rui |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Jin Hao,Jia Qing,Liu Ronghua,et al. Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy[J]. ACTA METALLURGICA SINICA,2019,55(12):1519-1526. |
| APA | Jin Hao.,Jia Qing.,Liu Ronghua.,Xian Quangang.,Cui Yuyou.,...&Yang Rui.(2019).Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy.ACTA METALLURGICA SINICA,55(12),1519-1526. |
| MLA | Jin Hao,et al."Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy".ACTA METALLURGICA SINICA 55.12(2019):1519-1526. |
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