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| MICROSTRUCTURES AND MECHANICAL PROPERTIES OF DIRECTIONALLY SOLIDIFIED NiAl–Cr(Mo)–Hf(Ho) EUTECTIC ALLOY |
| XIAO Xuan 1; XIE Yi 2; GUO Jianting 3 |
1. School of Materials Science and Engineering; Shenyang Ligong University; Shenyang 110168
2. Hunan Electric Power Test and Research Institute; Changsha 410007
3. Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
XIAO Xuan XIE Yi GUO Jianting. MICROSTRUCTURES AND MECHANICAL PROPERTIES OF DIRECTIONALLY SOLIDIFIED NiAl–Cr(Mo)–Hf(Ho) EUTECTIC ALLOY. Acta Metall Sin, 2010, 46(6): 701-707.
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Abstract The alloy with nominal composition of Ni-30.4Al-34Cr-4.3Mo-0.1Hf-0.05Ho (atomic fraction, %) has been directionally solidified at two withdrawal rates by liquid metal (Sn) cooling (LMC) process. Compared to the as-cast alloy, directional solidification process eliminates primary Cr(Mo) phase. With increasing withdrawal rate from 8 to 15 mm/min, the diameter of NiAl/Cr(Mo) eutectic cell decreases from 115 to 85 μm. In addition, the intercellular spaces and disordered regions become less. In virtue of the disappearance of primary Cr(Mo) phase, the mechanical properties of directionally solidified alloys are better than those of as--cast alloy and are further improved with increasing withdrawal rate.
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Received: 10 October 2009
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| [1] Noebe R D, Bowman R R, Nathal N V. Int Mater Rev, 1993; 38: 193
[2] Miracle D B. Acta Metall Mater, 1993; 41: 649
[3] Johnson D R, Oliver B F, Noebe R D, Whittenberger J D. Intermetallics, 1995; 3: 493
[4] Yang J M, Jeng S M, Bain K, Amato R A. Acta Metall Mater, 1997; 45: 295
[5] Johnson D R, Chen X F, Oliver B F, Noebe R D, Whittenberger J D. Intermetallics, 1995; 3: 99
[6] Walter J L, Cline H E. Metall Trans, 1970; 1: 1221
[7] Cline H E, Walter J L. Metall Trans, 1970; 1: 2907
[8] Cline H E, Walter J L, Lifshine E, Russell R R. Metall Trans, 1971; 2: 189
[9] Chen X F, Johnson D R, Noebe R D, Oliver B F. J Mater Res, 1995; 10: 1159
[10] Raj S V, Locci I E. Intermetallics, 2001; 9: 217
[11] Whittenberger J D, Raj S V, Locci I E, Salem J A. Intermetallics, 1999; 7: 1159
[12] Raj S V, Locci I E, Salem J A, Pawlik R J. Metall Mater Trans, 2002; 33A: 597
[13] Jachson K H, Hunt J D. Trans Metall Soc AIME, 1966; 236: 1129
[14] Whittenberger J D, Locci I E, Darolia R, Bowman R R. Mater Sci Eng, 1999; A268: 165
[15] Takeyama M, Liu C T. J Mater Res, 1990; 5: 1189
[16] Guo J T, Cui C Y, Qi Y H, Ye H Q. J Alloys Compd, 2002; 343: 142
[17] Guo J T, Huai K W, Gao Q, Ren W L, Li G S. Intermetallics , 2007; 15: 727
[18] Ren W L, Guo J T, Li G S, Zhou J. Mater Lett, 2003; 57: 1374 |
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