期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 48A, 期 10, 页码 5095-5105出版社
SPRINGER
DOI: 10.1007/s11661-017-4209-4
关键词
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资金
- National Natural Science Foundation of China [51401168]
- Shaanxi Provincial Natural Science Foundation [2016JQ5087]
- Fundamental Research Funds for the Central Universities [3102014JCQ01026]
- Aeronautical Science Foundation of China [2014ZF53065]
In this study, the microstructure of a beta-solidifying TiAl alloy was modified by means of temperature-controlled cooling. The microstructural evolution of the Ti-44.5Al-4Nb-2Cr-0.1B alloy in different cooling processes was investigated. The results showed firstly that both the solidification-segregation (S-segregation) and beta-segregation were reduced considerably by raising the temperature or extending the time in the single beta-phase region. Then samples were cooled through the beta + alpha phase region at the cooling rates of 2, 50, and 650 K/min. The B2-phase and some large gamma-phases exist in lamellar microstructure, which might be more evident at a higher cooling rate. Further, the Burgers relationships of {0001} (alpha 2)//{110} (beta(B2)) and {110} (alpha 2)//{111} (beta(B2)) were identified in the fast cooling microstructure, and the non-Burgers equiaxed alpha-grains grew easily at a slow cooling rate.
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