利用团簇+连接原子模型设计Ni-Nb基三元块体非晶成分.首先, 解析出二元共晶点Ni59.5Nb40.5的团簇式[(Ni0.5Nb0.5)-Ni6Nb6]Ni3, 其中,(Ni0.5Nb0.5)-Ni6Nb6为源自Ni6Nb7(Fe7W6型)共晶相的以(Ni0.5Nb0.5)为心的二十面体团簇. 相应的,具有最大非晶形成能力的Ni-Nb二元成分Ni62Nb38可描述成团簇式[Ni-Ni6Nb6]Ni3, 此时,二十面体团簇的中心位置完全由Ni占据.以[Ni-Ni6Nb6]Ni3二元非晶团簇式为基础,通过引入第3组元Zr, Ta 或Ag, 设计出具有更高非晶形成能力的Ni-Nb-(Zr, Ta, Ag)三元合金, 利用水冷铜模吸铸方法获得临界直径为3 mm的块体非晶.热分析和力学测试表明这些三元块体非晶具有较高的热稳定性,其中[Ni-Ni6Nb5Ta]Ni3具有最高的玻璃转变温度Tg(935 K)和晶化温度Tx(952 K); 这些三元块体非晶具有一定的塑性变形能力(延伸率约为0.3%), [Ni-Ni6Nb5Zr]Ni3和[Ni-Ni6Nb5Ta]Ni3块体非晶的压缩断裂强度分别达到3.2和3.4 GPa.
袁亮
,
羌建兵
,
庞厰
,
王英敏
,
王清
,
董闯
. 源自Ni--Nb共晶团簇式的Ni-Nb-(Zr, Ta, Ag) 三元块体非晶合金成分设计[J]. 金属学报, 2011
, 47(8)
: 1003
-1008
.
DOI: 10.3724/SP.J.1037.2011.00074
A cluster–plus–glue atom model was employed to design Ni–Nb based ternary bulk metallic glasses. The binary eutectic point Ni59.5Nb40.5 was first interpreted by the model in form of a cluster formula [(Ni0.5Nb0.5)–Ni6Nb6]Ni3, where the cluster is (Ni0.5Nb0.5)–centered icosahedron derived from a eutectic phase Ni6Nb7 (Fe7W6 type). It was then pointed out that the best binary glass former Ni62Nb38 could be interpreted based on the eutectic cluster formula by replacing the cluster center Nb0.5 with Ni0.5, namely [Ni–Ni6Nb6]Ni3=Ni62.5Nb37.5. To further improve the glass–forming ability, Zr, Ta and Ag are selected as alloying additions to partially replace Nb in the [Ni–Ni6Nb6]Ni3 cluster formula, and glassy rods with a critical size of 3 mm are achieved at appropriate ternary compositions by copper–mould suction–casting. DTA measurements indicate these bulk metallic glasses exhibit high thermal stabilities, among which the [Ni–Ni6Nb5Ta]Ni3 alloy has the highest Tg (glass transition temperature)of 935 K and Tx (crystallization temperature) of 952 K. Room–temperature compressive curves of [Ni–Ni6Nb5Zr]Ni3 and [Ni–Ni6Nb5Ta]Ni3 alloys show they have limited plasticity with a elongation of about 0.3%, fracture strength of the [Ni–Ni6Nb5Zr]Ni3 and [Ni–Ni6Nb5Ta]Ni3 BMGs are about 3.2 GPa and 3.4 GPa, respectively.
[1] Inoue A. Acta Mater, 2000; 48: 279
[2] Inoue A, Shen B L, Takeuchi A. Mater Trans, 2006; 47: 1275
[3] Kimura H, Inoue A, Yamaura S. Mater Trans, 2003; 62: 1167
[4] Xu D H, Duan G, Johnson W L, Garland C. Acta Mater, 2004; 52: 3493
[5] Ruhl R C, Giessen B C, Cohen M, Grant N J. Acta Metall, 1967; 15: 1693
[6] Xia L, Li W H, Fang S S, Wei B C, Dong Y D. J Appl Phys, 2006; 99: 26103
[7] Choi–Yim H, Xu D H, JohnsonWL. Appl Phys Lett, 2003; 82: 1030
[8] Chen L Y, Hu H T, Zhang G Q, Jiang J Z. J Alloys Comp, 2007; 443: 109
[9] Zhu Z W, Zhang H F, Ding B Z, Hu Z Q. Mater Sci Eng, 2008; 492: 221
[10] Zhang J L, Wang Y M, Shek C H, Wang Q, Dong C. J Alloys Comp, 2010; 491: 513
[11] Eckert J, Mattern N, Zinkevitch M, Seidel M. Mater Trans, 1998; 39: 623
[12] Waniuk T A, Schroers J, Johnson W L. Phys Rev, 2003; 67B: 184203
[13] Miracle D B, Sanders W S. Philos Mag, 2003; 83: 2409
[14] Miracle D B. Nature Mater, 2004; 3: 697
[15] Miracle D B. Acta Mater, 2006; 54: 4317
[16] Dong C, Wang Q, Qiang J B, Wang Y M, Jiang N, Han G, Li Y H, Wu J, Xia J H. J Phys, 2007; 40D: 273
[17] Wang Q, Qiang J B, Wang Y M, Xia J H, Zhang X F, Dong C. Intermetallics, 2004; 12: 1229
[18] Xia J H, Qiang J B, Wang Y M, Wang Q, Dong C. Appl Phys Lett, 2006; 88: 101907
[19] Wang Q, Zhu C L, Dong C, Qiang J B, Zhang W, Inoue A. J Phys: Confer Ser, 2008; 98: 12017
[20] Yuan L, Pang C, Wang Y M, Wang Q, Dong C. Intermetallics, 2010; 18: 1800
[21] Ma D, Tan H, Zhang Y, Li Y. Mater Trans, 2003; 44: 2007
[22] Pearson W B. Crystal Chemistry and Physics of Metals and Alloys. New Jersey: Wiley, 1972: 1
[23] Chen J X,Wang Q,Wang Y M, Qiang J B, Dong C. Philos Mag Lett, 2010; 90: 683
[24] Lu Z P, Liu C T. J Mater Sci, 2004; 39: 3965
[25] Yan M, Zou J, Shen J. Acta Mater, 2006; 54: 3627
