【摘要】 研究了Zr41.2Ti13.8Cu12.5Ni10Be22.5非晶合金在过冷液相区内静液挤压的变形行为以及结构变化。结果表明:非晶合金在高应变速率下产生了明显的塑性变形,直径从16 mm变为12 mm,断裂为4段,且样品断口上随机分布着充分发展与未充分发展的脉纹式切变带,由此可看出非晶合金的变形为非牛顿体变形行为;挤压后的样品约有3%的非晶相发生晶化,在非晶基体上析出10~20 nm的纳米晶粒,导致挤压后非晶合金的热稳定性降低;静液挤压高应变速率变形条件使非晶合金产生非均匀流变,是造成非晶合金断裂的主要原因。更多还原

【Abstract】 The deformation behavior and structure of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk amorphous alloy processed at 663K with strain rate of 0.28s^-1 by hydrostatic extrusion were studied.The results show that the alloy undergoes obvious plastic elongation,the specimen fractures into four sections and the diameter changes from 16mm to 12mm.The fracture surfaces distribute randomly well developed and partially developed veinal patterns.The deformation behavior of alloy is non-Newtonian flow behavior.About 3% amorphous matrix of extruded specimen transforms crystal,the crystal particles with size of 1020mm are precipitated in the amorphous matrix,the thermostability of the extruded specimen was lowered.The failure of the alloy is mainly attributed to non-uniform viscous flow under high strain rate resulting from the hydrostatic extrusion process.更多还原