采用光悬浮区熔定向凝固技术制备了Nb-Mo-Si三元共晶合金,研究了试棒旋转速度和抽拉速度对Nbss-β(Nb,Mo)5Si3共晶组织形态的影响.结果表明籽晶棒的旋转对组织形态有显著影响,而料棒的旋转对组织形态的影响并不明显.当抽拉速度是5 mm/h,籽晶棒不旋转时,得到了规则的Nbss-β(Nb,Mo)5Si3片层结构；而当籽晶棒旋转时,试棒中心处为先析出的球状Nbss和规则片层组织,沿径向向外,规则的片层组织逐步转变成不规则的碎块状组织.当籽晶棒不旋转,抽拉速度是1 mm/h时,组织为不规则共晶组织,Nbss倾向于连成网状；当抽拉速度是3～5 mm/h时,形成典型的规则片层组织；当抽拉速度是10 mm/h时,具有片层组织的柱状晶和胞状晶共存.此外,从液/固界面特性及过冷度的角度对组织多样性进行了讨论.
参考文献
| [1] | Bewlay B P;Jackson M R;Zhao J C et al.[J].MRS Bulletin,2003,28:646. |
| [2] | Gavens A J;Heerden D V;Foecke T et al.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1999,30:2959. |
| [3] | Heerden D V;Gavens A J;Subramanian P R et al.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2001,32:2363. |
| [4] | Shang C.H.;Heerden D.V. .AN X-RAY ST'UDY OF RESIDUAL STRESSES AND BENDING STRESSES IN FREE-TANDING Nb/Nb_5Si_3 MICROLAMINATFS[J].Acta materialia,2000(13):3533-3543. |
| [5] | 何永胜,郭喜平,郭海生,孙志平.铌硅化物基超高温合金整体定向凝固组织和固/液界面形态演化[J].金属学报,2009(09):1035-1041. |
| [6] | Ma C L;Tan Y;Tanaka H et al.[J].Materials Transactions-Japan Institute of Metals,2000,41:1329. |
| [7] | Ma C L;Li J G;Tan Y et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2004,386:375. |
| [8] | Shah DM.;Pope DP.;Chin S.;Anton DL. .IN-SITU REFRACTORY INTERMETALLIC-BASED COMPOSITES[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(0):658-672. |
| [9] | Bewlay B P;Jackson M R;Subramanian P R .[J].JOM-Journal of the Minerals Metals and Materials Society,1999,51:32. |
| [10] | 刘肖 .[D].北京:北京航空航天大学,2008. |
| [11] | 魏强 .[D].北京:北京航空航天大学,2009. |
| [12] | Kraft R W;Albright D L .[J].Transactions of the Metallurgical Society of AIME,1961,221:95. |
| [13] | Mollard F R;Flemings M C .[J].Transactions of the Metallurgical Society of AIME,1967,239:1526. |
| [14] | Elliot R.Eutectic Solidification Processing Crystalline and Glassy Alloys[M].London:butterworth,1983:125. |
| [15] | Barin I.Thermo-Chemical Data of Pure Substances[M].Verlag Gmbh,Germany:WILEY-VCH,1995 |
| [16] | Liang H;Chang Y A .[J].Intermetallics,1999,7:561. |
| [17] | Meschel SV.;Kleppa OJ. .Standard enthalpies of formation of some 4d transition metal silicides by high temperature direct synthesis calorimetry[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(1/2):193-200. |
| [18] | Croker M N;Fidler R S;Smith R W .[J].Proceedings of the Royal Society,1973,335:15. |
| [19] | 胡汉起.Metal Solidification Theory(金属凝固原理[M].北京:机械工业出版社,2000:170. |
| [20] | Magnin P;Trivedi R .[J].Acta Metallurgica Et Materialia,1991,39:453. |
| [21] | Jackson K A;Hunt J D .[J].Transactions of the Metallurgical Society of AIME,1966,236:1129. |
| [22] | Fisher D J;Kurz W .[J].Acta Metallurgica,1980,28:777. |
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