Mechanism,condition and characteristics for the formation of the network structure in a group of Zr-Al-Ni-Cu bulk metallic glasses(BMGs) were investigated.The results show that the constituent segregation and/or the symplastic growth would be the mechanisms for the formation of the cell structure in the present Zr-Al-Ni-Cu BMGs.The cell structure can be easily obtained for the glass forming alloys whose compositions locate nearby the eutectic point.The shorter the distance is from the eutectic point,the larger the cell and the thicker the cell wall of the network structure will be.The present investigation would provide useful information for the development of the BMG with the network structure.
AN WeiKeDING DaWeiCAI AnHuiZHOU GuoJunLUO YunLI JiangHongPENG YongYi
本文系统地研究了Cu50Zr50-xAlx(0?x?11.0)合金的相形成、玻璃形成能力、热学和机械性能.结果表明,Cu50Zr47Al3合金具有最好的玻璃形成能力、最小的脆性参数和最高的断裂强度.Cu50Zr50-xAlx(0?x?5.0)合金由B2 Cu Zr和B19’Cu Zr两相组成,当5.05.0)合金的大,Cu50Zr50-xAlx(0?x?4.0)合金的成分偏离共晶成分,而Cu50Zr50-xAlx(5.0?x?11.0)合金为近共晶成分.玻璃转变激活能、晶化激活能和晶化峰激活能随其敏感性因素的增加而降低.所述的铜基合金都表现为室温压缩脆性.另外,对其相的形成和玻璃形成能力与Al含量的关系也进行了探讨.
