The effects of boron on the solidification behaviors of Ti45AlxB alloys were studied by high temperature samples. These samples were melted at 1823 K, followed by cooling to the designated temperature, and then quickly water-quenched to preserve the solidification features. Optical microscopy and scanning electron microscopy analysis shows that the solidus temperature of Ti45AI was really reduced by 20 K when adding 0.8 at. pct B, and it was also observed that boride precipitated before the appearance of β phase. Besides, solidification structure confirmed that B addition does not obviously refine β phase, α grain refinement by certain amount of B in alloy probably clarifies the mechanism of B refining lamellar microstructure at room temperature.
参考文献
| [1] | U. Kitkamthorn;L.C. Zhang;M. Aindow .The structure of ribbon borides in a Ti-44Al-4Nb-4Zr-lB alloy[J].Intermetallics,2006(7):759-769. |
| [2] | D. Hu .Effect of composition on grain refinement in TiAl-based alloys[J].Intermetallics,2001(12):1037-1043. |
| [3] | K. Liu;Y.C. Ma;M. Gao .Single step centrifugal casting TiAl automotive valves[J].Intermetallics,2005(9):925-928. |
| [4] | U. Hecht;V. Witusiewicz;A. Drevermann .Grain refinement by low boron additions in niobium-rich TiAl-based alloys[J].Intermetallics,2008(8):969-978. |
| [5] | D. Hu;A.J. Huang;D. Novovic .The effect of boron and alpha grain size on the massive transformation in Ii-46Al-8Nb-xB alloys[J].Intermetallics,2006(7):818-825. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%