在熔体温度为2000℃的条件下,分别以2.5,5,10,20,50和100μm/s的抽拉速率对Nb-Ti-Si基超高温合金进行了有坩埚整体定向凝固.采用XRD,SEM和EDS等分析方法,研究了抽拉速率对定向凝固共晶组织及固/液界面形貌的影响,并分析了该合金的凝固过程.结果表明:合金定向凝固组织主要由沿着试棒轴向排列的横截面呈花瓣状的共晶胞Eutectic Ⅰ (Nbss/α(Nb,X)5Si3)以及分布于共晶胞周围的沿试棒轴向耦合生长的共晶组织Eutectic Ⅱ(Nbss/γ(Nb,X)5Si3)组成.随着凝固速率的增大,组织细化,花瓣状共晶胞由以硅化物或细小共晶为中心的近似圆形形貌逐渐演变为以十字形Nbss为中心、α(Nb,X)5Si3呈片状向外辐射生长的四边形形貌；Eutectic Ⅱ则呈沿纵向耦合生长的层片状形貌.固/液界面形貌经历了由胞枝状→树枝状→胞枝状的演变过程.
参考文献
| [1] | Bewlay B P,Jackson M R,Zhao J C,Subramanian P R,Mendirstta M G,Lewandowski J J.MRS Bull,2003; 28:646 |
| [2] | Bewlay B P,Jackson M R,Zhao J C,Subramanian P R.Metall Mater Trans,2003; 34A:2043 |
| [3] | Kang Y W,Qu S Y,Song J X,Han Y F.Acta Metall Sin,2008; 44:593(康永旺,曲士昱,宋尽霞,韩雅芳.金属学报,2008; 44:593) |
| [4] | Kim W Y,Tanaka H,Kasama A,Hanada S.Intermetallics,2001; 9:827 |
| [5] | Guo X P,Guo H S,Yao C F.Int J Mod Phys,2009; 23B:1093 |
| [6] | Qu S Y,Han Y F,Song L G.Intermetallics,2007; 15:810 |
| [7] | Li Z,Peng L M.Acta Mater,2007; 55:6573 |
| [8] | Guo H S,Guo X P.Scr Mater,2011; 64:637 |
| [9] | Yang Y,Bewlay B P,Chang Y A.J Phase Equilib Diffus,2007; 28:107 |
| [10] | Yao C F,Guo X P,Guo H S.Acta Metall Sin,2008; 44:579(姚成方,郭喜平,郭海生.金属学报,2008; 44:579) |
| [11] | Guo X P,Gao L M.J Aeronaut Mater,2006; 26(3):47(郭喜平,高丽梅.航空材料学报,2006; 26(3):47) |
| [12] | Tian Y X,Guo J T,Cheng G M,Sheng L Y,Zhou L Z,He L L,Ye H Q.Mater Des,2009; 30:2274 |
| [13] | Cheng G M,He L L.IntermetaIlics,2011; 19:196 |
| [14] | Su L F,Jia L N,Feng Y B,Zhang H R,Yuan S N,Zhang H.Mater Sci Eng,2013; 560:672 |
| [15] | Wang Y,Guo X P.Acta Metall Sin,2010; 46:506(王勇,郭喜平.金属学报,2010; 46:506) |
| [16] | He Y S,Guo X P.Acta Metall Sin,2009; 45:1035(何永胜,郭喜平.金属学报,2009; 45:1035) |
| [17] | Zelenitsas K,Tsakiropoulos P.Intermetallics,2005; 13:1079 |
| [18] | Qu S Y,Han Y F,Kang Y W.Sci China,2009; 52E:37 |
| [19] | Sun Z P,Guo X P,He Y S,Guo J M,Yang Y,Chang Y A.Intermetallics,2010; 18:997 |
| [20] | Geng J,Tsakiropoulos P,Shao G S.Intermetallics,2007;15:69 |
| [21] | Wang L G,Jia L N,Cui R J,Zheng L J,Zhang H.Chin J Aeronaut,2012; 25:292 |
| [22] | Fu H Z,Guo J J,Liu L,Li J S.Directional Solidification and Processing of Advanced Materials.Beijing:Science Press,2008:29(傅恒志,郭景杰,刘林,李金山.先进材料定向凝固.北京:科学出版社,2008:29) |
| [23] | Zhou Y H,Hu Z Q,Jie W Q.Solidification Processing.Beijing:China Machine Press,1998:158(周尧和,胡壮麒,介万奇.凝固技术.北京:机械工业出版社,1998:158) |
| [24] | Hu H Q.Fundamental ofMetallic Solidification.2nd Ed.,Beijing:China Machine Press,2000:165(胡汉起.金属凝固原理.第2版,北京:机械工业出版社,2000:165) |
| [25] | Tang L,Ma C L,Zhao X Q.Rare Met Mater Eng,2009;38:8 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%