Ontology type: schema:ScholarlyArticle
2016-06-20
AUTHORSGuang Chen, Yingbo Peng, Gong Zheng, Zhixiang Qi, Minzhi Wang, Huichen Yu, Chengli Dong, C. T. Liu
ABSTRACTTiAl alloys are lightweight, show decent corrosion resistance and have good mechanical properties at elevated temperatures, making them appealing for high-temperature applications. However, polysynthetic twinned TiAl single crystals fabricated by crystal-seeding methods face substantial challenges, and their service temperatures cannot be raised further. Here we report that Ti–45Al–8Nb single crystals with controlled lamellar orientations can be fabricated by directional solidification without the use of complex seeding methods. Samples with 0° lamellar orientation exhibit an average room temperature tensile ductility of 6.9% and a yield strength of 708 MPa, with a failure strength of 978 MPa due to the formation of extensive nanotwins during plastic deformation. At 900 °C yield strength remains high at 637 MPa, with 8.1% ductility and superior creep resistance. Thus, this TiAl single-crystal alloy could provide expanded opportunities for higher-temperature applications, such as in aeronautics and aerospace. More... »
PAGES876-881
http://scigraph.springernature.com/pub.10.1038/nmat4677
DOIhttp://dx.doi.org/10.1038/nmat4677
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/27322822
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