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选择Cu50-x Zr40+x Al5Nb5(x=0,2,4,6)合金,研究主要元素成分变化对非晶形成能力和组织的影响,分析了组织结构和力学性能的关系。结果表明,玻璃形成最优成分为Cu46Zr44Al5Nb5,ΔTx、Trg、γ参数分别为51.9 K,0.60,0.401,具有良好的热稳定性。全非晶结构的Cu46Zr44Al5Nb5合金其断裂强度高达1811 MPa,无明显宏观塑性变形;断口表面较平整,且伴有明显的脉络状花样大面积的分布在断面上,扩展方向一致。非晶-晶体复合结构的Cu44Zr46Al5Nb5合金具有较好综合力学性能,其断裂强度达到1747 MPa,塑性应变为3.94%;断口平滑区分布着大面积细密且深的脉络状花样,剪切带宽度约为40μm,与压缩轴向约成45°。Cu44Zr46Al5Nb5合金析出结晶相的尺寸小于剪切带的宽度,且分布均匀,外力加载时对非晶基体起到一定的增韧作用。结晶相的组织结构和尺寸分布决定了非晶-晶体复合材料的力学行为。
The Cu50-xZr40 + xAl5Nb5 (x = 0, 2, 4, 6) alloy was chosen to study the influence of the composition of the main elements on the formability and microstructure. The relationship between microstructure and mechanical properties was analyzed. The results show that the optimum composition of glass is Cu46Zr44Al5Nb5, the parameters of ΔTx, Trg and γ are 51.9 K, 0.60 and 0.401, respectively. It has good thermal stability. All-amorphous Cu46Zr44Al5Nb5 alloy fracture strength up to 1811 MPa, no significant macroscopic plastic deformation; fracture surface is relatively flat, and accompanied by a large pattern of large-scale distribution of the venation pattern in the section, the expansion of the same direction. Amorphous - crystalline composite structure of Cu44Zr46Al5Nb5 alloy has good mechanical properties, the fracture strength of 1747 MPa, plastic strain of 3.94%; smooth fracture zone is distributed in a large area of fine and deep vein-like pattern, the shear zone width of about 40 μm, approximately 45 ° to the compression axis. The size of precipitated crystalline phase of Cu44Zr46Al5Nb5 alloy is smaller than the width of the shear band, and the distribution is uniform. When the external force is applied, the amorphous matrix plays a role of toughening. The structure and size distribution of the crystalline phase determine the mechanical behavior of amorphous-crystalline composites.