Abstract
In this study, the microstructure of a β-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 β-segregation were reduced considerably by raising the temperature or extending the time in the single β-phase region. Then samples were cooled through the β + α phase region at the cooling rates of 2, 50, and 650 K/min. The B2-phase and some large γ-phases exist in lamellar microstructure, which might be more evident at a higher cooling rate. Further, the Burgers relationships of {0001}α2//{110}β(B2) and {112 ¯ 0}α2//{111}β(B2) were identified in the fast cooling microstructure, and the non-Burgers equiaxed α-grains grew easily at a slow cooling rate.
| Original language | English |
|---|---|
| Pages (from-to) | 5095-5105 |
| Number of pages | 11 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 48 |
| Issue number | 10 |
| DOIs | |
| State | Published - 1 Oct 2017 |
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