采用惰性形核涂层型壳和氩气保护下循环过热的深过冷方法,系统研究了深过冷条件下Al72Ni12Co16合金的凝固组织演化过程及单相准晶的生成条件.结果表明: 在0～200 K的过冷度范围内,随过冷度的增大,Al72Ni12Co16合金发生小过冷树枝晶→柱状晶→等轴晶的组织转变,转变的两个临界过冷度分别韦T1＝60 K和ΔT2＝120 K; 此外,当熔体过冷度大于60 K时,准晶相在与晶体相的竞争形核中胜出,作为初始相从熔体中析出,并随过冷度的增大,凝固组织逐渐变为单相准晶.
参考文献
| [1] | 董闯.准晶材料[M].北京:国防工业出版社,1998:2. |
| [2] | Shechtman D;Blech I .The microstructure of rapidly solidified Al6Mn[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1985,A16:1005. |
| [3] | Y. Yokoyama;R. Note;S. Kimura .Preparation of Decagonal Al-Ni-Co Single Quasicrystal by Czochralski Method[J].Materials transactions,1997(11):943-949. |
| [4] | Tsai A P .Growing perfect quasicrystals[J].Journal of Non-Crystalline Solids,1999,250252:833. |
| [5] | 樊建锋 .深过冷Al<,72>Ni<,12>Co<,16>合金的组织演化及十面体单相准晶的制备[D].西北工业大学,2002. |
| [6] | Boettinger W J;Coriell S R;Trivedi R;Mehrabian R, Parrish P A.Rapid Solidification Processing: Principles and Technologies IV[C].Claitors Baton Rouge LA,1988:13. |
| [7] | Chattopadhyay K;Ravishankar N;Goswami R .Sha-pes of quasicrystals[J].Progress in Crystal Growth and Characterization of Materials,1997,34:237. |
| [8] | Toner J.Growth and roughening of quasicrystals and other incommensurate systems[J].PHYSICAL REVIEW LETTERS,1990:930. |
| [9] | LIU Yongchang,YANG Gencang,LIU Xinbao,ZHOU Yaohe.Growth of decagonal quasicrystal phase in laser resolidified Al72Ni12Co16[J].科学通报（英文版）,2000(14):1315-1319. |
| [10] | 胡德林.金属学原理[M].西安:西北工业大学出版社,1995:92. |
| [11] | Li JF.;Yang GC.;Zhou YH. .Effect of solidification time on the structural evolution of undercooled single phase alloys[J].Journal of Crystal Growth,1999(1/2):141-146. |
| [12] | Volkmann T.;Willnecker R.;Herlach DM.;Wilde G. .Nonequilibrium solidification of hypercooled Co-Pd melts[J].Journal of Applied Physics,1998(6):3028-3034. |
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