添加微量Fe对Zr55Al10Ni5Cu30块体金属玻璃非晶形成能力和力学性能的影响

摘要

通过磁悬浮熔炼和铜模吸铸法制备直径3 mm的(Zr0.55Al0.10Ni0.05Cu0.30)100-xFex(x=0,1,2,3,4)合金试样,研究Fe元素的微量添加对Zr55Al10Ni5Cu30块体金属玻璃非晶形成能力和力学性能的影响.研究表明,合理添加Fe元素(不超过3％,摩尔分数)导致约化玻璃转变温度Trg(=Tg/Tl)和参数γ(=Tx/(Tg+Tl))增大,因而其非晶形成能力增大,但添加过量的Fe元素(4％)会导致其非晶形成能力的降低.添加Fe元素也会显著地改善Zr55Al10Ni5Cu30块体金属玻璃的压缩塑性及提高其压缩断裂强度,当Fe元素的添加量为2％时,直径3mm、长度6mm的试样在压缩时出现一定的塑性及加工硬化现象.Fe元素添加量为4％形成的金属玻璃基复合材料,同样也显示良好的压缩塑性和高的压缩断裂强度.%A series of rod samples with diameter of 3 mm (Zr0.55Al0.10Ni0.05Cu0.30)100-xFex(x=0,1,2,3,4) were prepared by magnetic suspend melting and copper mold suction casting method.The effects of a small amount of Fe on glass forming ability(GFA) and mechanical properties of Zr55Al10Ni5Cu30 bulk metallic glass (BMG) were investigated.The results show that the addition of an appropriate amount (less than 3％,mole fraction) of Fe enhances GFA,as indicated by the increase in the reduced glass transition temperature Trg(=Tg/Tl) and the parameter γ(=Tx/(Tg+Tl)) with increasing Fe content,and GFA gets deteriorated by further Fe addition (4％).The addition of Fe also effectively improves the compressive plasticity and increases the compressive fracture strength in these Zr-based BMGs,Compressive tests on BMG sample with 3 mm in diameter and 6 mm in length reveal work-hardening and a certain plastic strain in the alloy containing 2％ Fe.The BMG composite containing 4％ Fe also exhibits a high fracture strength along with significant plasticity.