塑性钛基非晶复合材料的制备及性能

通过铜模喷铸法成功制备了一系列内生β-Ti(Zr, Nb)枝晶增塑的Ti-Zr-Nb-Cu-Be非晶复合材料, 研究了成分对枝晶体积分数及尺寸的影响及其对复合材料力学性能的调节作用。结果表明, Ti₄₈Zr₂₀Nb₁₂Cu₅Be₁₅合金压缩强度达到2061 MPa, 塑性变形高达22.5%, 表现出优异的综合力学性能。 非晶复合材料的塑性不仅与β-Ti(Zr,Nb)枝晶相的体积分数有关, 而且受到枝晶尺寸的强烈影响, 在一定体积分数条件下, 枝晶相的尺寸越大, 对剪切带的阻碍作用越明显, 合金的塑性越高。

Preparation and properties of Ti-based metallic glass composites

A series of Ti-Zr-Nb-Cu-Be metallic glass matrix composites with β-Ti(Zr, Nb) dendrites were synthesized by the copper-mold injection casting. The effects of the components on the size and volume fraction of dendrites were studied, and the mechanical properties of the samples were also investigated. The results show that Ti₄₈Zr₂₀Nb₁₂Cu₅Be₁₅ performs good mechanical properties with compressive strength of 2061 MPa and plasticity up to 22.5%. The plasticity of metallic glass matrix composites is not only determined by the volume fraction of dendries, but also by the size of dendrites. The larger the dendrites, the more obvious for the resistance of moving shear bands, and the much higher plasticity of the alloy.