以纯金属为原料，采用磁悬浮熔炼-铜模吸铸法制备了直径不同(即冷却速率不同)的块状(Zr56 Co28 Al16)98 Y2非晶合金，同时采用冷却速率更高的甩带法制备了同成分的条带状非晶合金，研究了冷却速率对该合金显微结构和力学性能的影响。结果表明：随着冷却速率降低，块状非晶合金的塑性降低，硬度增大，非晶合金中冻结的自由体积减小，非晶合金基体内逐渐有纳米晶析出，但这并没有提高合金的塑性；自由体积更多的合金具有更高的塑性。%Taking pure metal as raw materials,bulk amorphous alloy (Zr56 Co28 Al16 )98 Y2 with different diameters (different cooling rates )was fabricated by magnetic floating melting and water-cooling copper mold techniques,and amorphous ribbon with same composition was fabricated by melt spinning method with high cooling rate.The effects of cooling rate on microstructure and mechanical properties were studied.The results indicate that with the decrease of cooling rate,plasticity of bulk amorphous alloy decreased,while its hardness increased,and the free volume in amorphous alloy decreased.In addition,there were nanocrystals embedded in the amorphous matrix. The plasticity,however,was not enhanced by the absence precipitation of nanocrystals.The more free-volume would result in a better plasticity of the amorphous alloy.
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