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用半固态铸造法制备了Cu40Zr44Ag8Al8非晶复合材料,通过X射线衍射仪(XRD)、同步示差扫描量热仪(DSC)、扫描电镜(SEM)、透射电镜(TEM)、电子探针(EPMA)、单轴压缩试验等手段,研究了保温时间对非晶复合材料显微结构和力学性能的影响。结果表明,该复合材料非晶基体中弥散分布着5~50μm的Al3Zr相,且随着保温时间延长,非晶基体的热稳定性不断下降,复合材料中晶化相体积分数不断增大,晶粒更加细小,但其强度却呈下降趋势。断口分析发现,复合材料中析出晶体相的种类是影响非晶复合材料力学性能的主要因素,脆性Al3Zr金属间化合物的析出使试样更容易出现应力集中而降低了试样的强度。
The Cu40Zr44Ag8Al8 amorphous composites were prepared by semi-solid casting method and characterized by XRD, DSC, SEM, EPMA, , Uniaxial compression test and other means to study the effect of holding time on the microstructure and mechanical properties of amorphous composites. The results show that 5 ~ 50μm Al3Zr phase is dispersed in the amorphous matrix, and the thermal stability of amorphous matrix decreases with the increase of holding time. The volume fraction of crystallized phase in the composite increases continuously. The grain is finer, but its intensity is declining. Fracture analysis shows that the type of crystal phase precipitated in the composite is the main factor affecting the mechanical properties of the amorphous composite. The precipitation of brittle Al3Zr intermetallic compounds makes the sample more prone to stress concentration and reduces the strength of the sample.