四种块体非晶合金在过冷液相区内的微成形能力

Microformability of Bulk Amorphous Alloys in the Supercooled Liquid Region

摘要:

采用Si模制作的V型槽微压印实验评价了4种具有不同脆度的块体非晶合金（Pd40Cu30Ni10P20，Zr65Cu15Al10Ni10，Cu46Zr42Al7Y5，Zr58.5Cu15.6Al10.3Ni12.8Nb2.8）在过冷液相区内的微成形能力。结果表明，尽管不同的BMG表现出不同的表观粘度，但在相同的应变条件下，各种BMG却呈现出相似的充型面积，这表明它们具有相似的微成形能力。这一结果源于在本实验条件下（成形温度T=1.07Tg， 应变率=2×10-3 s-1），各BMG均遵循相同的牛顿流变机制。最后，通过有限元模拟验证了这一结论。

Abstract:

The microformability in the supercooled liquid region of 4 bulk metallic glasses (Pd40Cu30Ni10P20, Zr65Cu15Al10Ni10, Cu46Zr42Al7Y5, Zr58.5Cu15.6Al10.3Ni12.8Nb2.8) with different fragility values was investigated with microimprinting experiment on a micro-V shaped silicon mould. Results show that the bulk metallic glasses (BMGs) show different apparent viscosity. But under the condition of the same deformation, the 4 BMGs exhibit almost the same area of flowed into the groove, namely they show similar microformability. This is attributed to the adopted experimental conditions (T＝1.07Tg,＝2×10-3 s-1) under which the BMGs show a Newtonian flow behavior. The FEM study also verifies this conclusion.