摘要
将Zr_(55)Al_(10)Ni_5Cu_(30)块体非晶合金在715 K等温退火30 min,引入少量纳米晶,然后于室温以不同的应变速率进行轧制,用差示扫描量热仪考察不同应变量样品的热稳定性和自由体积演化.结果表明:即使轧制到95%的最大应变量,样品的热稳定性也几乎没有发生改变.在各种应变速率下,随着应变量的增加,自由体积含量持续上升.但随着应变速率的增加,相同应变量下自由体积的含量先上升后降低,该规律与单一非晶态结构合金在塑性变形过程中自由体积的变化情况截然不同.
Traces of nanocrystals are introduced into Zr55AlloNisCu30 bulk metallic glass through isothermally annealing the glass at 715 K for 30 min. The pre-annealed samples are rolled at different strain rates up to 95% thickness reduction at room temperature. The thermal stability and the free volume of the deformed sample are examined by differential scanning calorimetry. It is found that the thermal stability does not change with deformation degree. At any strain rate, free volume content increases continuously with the increase of deformation degree without saturation. As strain rate increases, however, the free volume content with the same deformation degree first increases and then decreases, which is significantly different from the case of the metallic glass with monolithic amorphous structure under plastic deformation.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第8期349-354,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:50771064)
高等学校博士学科点专项科研基金(批准号:20060248022)资助的课题~~
关键词
块体非晶合金
塑性变形
自由体积
bulk metallic glass, plastic deformation, free volume
