SiC颗粒对Zr_(55)Al_(10)Ni_5Cu_(30)非晶形成能力和热稳定性的影响

EFFECT OF SiC_p ON THE GLASS FORMING ABILITY AND THERMAL STABILITY OF BULK METALLIC GLASS

采用钢模铸造方法成功制备了体积分数高达27％的SiC/Zr_(55)Al_(10)Ni_5Cu_(30)块体非晶复合材料,光学显微镜、X射线衍射和透射电镜分析表明,非晶基体上均匀分布SiC颗粒,SiC颗粒与基体间形成了厚度为10nm的反应层,DSC分析表明,块体非晶复合材料的玻璃转变温度、晶化温度和过冷液相区随SiC体积分数的增加而提高,电子探针分析和计算结果表明,Si原子和部分C原子通过扩散进入基体合金中,从而提高了非晶合金的形成能力和热稳定性。

The Zr55Al10Ni5Cu3o bulk metallic glass reinforced with 27% SiC (volume fraction) particles was successfully synthesized by copper mold casting method. Structure, microstructure, and thermal properties of the composites were investigated by X-ray diffraction, optical microscopy and differential scanning calorimetry. The results show that not only the matrix remains amorphous but also the glass forming ability and thermal stability is also enhanced. The reaction at interface between the matrix and the reinforcement was investigated with transmission electron microscopy and electron microprobe. A 10 nm reacted layer is formed between the matrix and SiC particle. Both Si and some of C atoms diffused into matrix during processing, resulting in the improvement of the glass forming ability and thermal stability.