TiNb颗粒增韧铜锆基非晶复合材料的机制

Toughening Mechanism of Zr-Based and Cu-Based Bulk Metallic Glasses Composites by TiNb Particle

摘要:

采用放电等离子烧结(Spark Plasma Sintering, SPS)方法成功制备得到10%（体积分数）TiNb/Zr55Cu30Al10Ni5和TiNb/Cu46Zr42Al7Y5非晶基体复合材料。压缩力学实验表明，TiNb颗粒对Zr55Cu30Al10Ni5的增韧效果明显好于对Cu46Zr42Al7Y5。究其原因是Zr55Cu30Al10Ni5的塑性转变区域的长度Rp值高于Cu46Zr42Al7Y5，这就意味着TiNb颗粒分布在Zr55Cu30Al10Ni5的塑性转变区域的几率明显高于Cu46Zr42Al7Y5基体。因此，TiNb颗粒对Zr55Cu30Al10Ni5基体的增韧效果明显要好于Cu46Zr42Al7Y5。

关键词:放电等离子烧结;非晶复合材料;压缩力学性能;断裂韧性

Abstract:

TiNb/Zr55Cu30Al10Ni5 and TiNb/Cu46Zr42Al7Y5 bulk metallic glass composites were prepared by Spark Plasma Sintering (SPS). The compression results show that TiNb/Zr55Cu30Al10Ni5 composites get larger plasticity than TiNb/Cu46Zr42Al7Y5 composites. The reason is that Zr55Cu30Al10Ni5 bulk metallic glass is resistant to micro-crack. The fracture toughness test proves that KC of Zr55Cu30Al10Ni5 is higher than that of Cu46Zr42Al7Y5, so there is a larger length scale of plastic process zone Rp for Zr55Cu30Al10Ni5.

Key words:spark plasma sintering (SPS); bulk metallic glass composites; compression mechanical property; fracture toughness