| Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation | |
| Jin, Hao1,2; Jia, Qing1; Xian, Quangang1; Liu, Ronghua1; Cui, Yuyou1; Xu, Dongsheng1; Yang, Rui1 | |
| Corresponding Author | Yang, Rui(ryang@imr.ac.cn) |
| 2020-10-01 | |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| ISSN | 1005-0302 |
| Volume | 54Pages:190-195 |
| Abstract | Large size polysynthetically twinned crystals of Ti-46Al-8Nb alloy with a parallel lamellar microstructure were successfully prepared using a Ti-43Al-3Si seed by our new operation. A large amount of columnar B2 phase paralleling to the growth direction was found in the final lamellar microstructure. Higher growth rate (>30 mm/h) led to the failure of seeding process. Based on these results, a new mechanism is proposed to describe the seeding process of the hypo-peritectic TiAl alloys. The peritectic alpha. phase is suggested to directly nucleate from the melt, and then act as nucleus for transformed alpha. phase in the subsequent beta to alpha. transformation. At the higher growth rate, the appearance of beta phase secondary dendrites and homogeneous nucleation lead to the failure of seeding process. High Nb addition leads to a large amount of residual beta phase, and these beta dendrites finally evolve into B2 phase. The room temperature tensile elongation was measured to be 11.9-18.5% for Ti-46Al-8Nb PST crystals, which is the highest ever reported value for TiAl based alloys. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| Keyword | TiAl alloys Polysynthetically twinned crystals Peritectic solidification Seeded growth Ductility |
| Funding Organization | National Natural Science Foundation of China ; National Key Research and Development Program of China |
| DOI | 10.1016/j.jmst.2019.10.046 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51701209] ; National Key Research and Development Program of China[2016YEB0701304] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000545310500019 |
| Publisher | JOURNAL MATER SCI TECHNOL |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/139603 |
| 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, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Jin, Hao,Jia, Qing,Xian, Quangang,et al. Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,54:190-195. |
| APA | Jin, Hao.,Jia, Qing.,Xian, Quangang.,Liu, Ronghua.,Cui, Yuyou.,...&Yang, Rui.(2020).Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,54,190-195. |
| MLA | Jin, Hao,et al."Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 54(2020):190-195. |
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