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.
YUAN Liang
,
QIANG Jian-Bing
,
PANG Chang
,
YU Yang-Min
,
YU Qing
,
DONG Chen
. COMPOSITION DESIGN OF Ni–Nb–(Zr, Ta, Ag) TERNARY BULK METALLIC GLASSES BASED ON CLUSTER FORMULA OF Ni–Nb EUTECTIC[J]. Acta Metall Sin, 2011
, 47(8)
: 1003
-1008
.
DOI: 10.3724/SP.J.1037.2011.00074
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