Ni/Cu比对锆基非晶合金热稳定性与力学性能的影响

Effect of Ni with Cu content ratio on thermal stability and Mechanical Properties of Zr-based Amorphous Alloy

摘要:

采用铜模吸铸法制备了直径为2mm的Zr70Al8Cu22-xNix（x=8.5,9,9.5,10,10.5,11）合金，通过差示扫描量热法（DSC）、单轴压缩实验等方法研究了Ni/Cu比对Zr基非晶合金热稳定性与力学性能的影响。结果表明，随Ni/Cu比增加，过冷液相区宽度ΔTx基本在80~81K之间，但Ni/Cu比为0.63和0.76时对应较高的ΔTx，在Ni/Cu比为0.76时，热稳定性达到最大值89K，热稳定性较好；随Ni/Cu比增加，塑性应变整体呈下降趋势，但在Ni/Cu比为0.76时出现反常增大，具有良好的塑性，屈服强度整体呈下降趋势，其变化的规律性不强，存在波动性。弹性模量在Ni/Cu比为0.63时达到最大值80GPa，其余Ni/Cu比合金则在58~65GPa范围内变化；总体来讲，Ni/Cu比为0.63时的合金塑性应变、屈服强度及弹性模量E均达到最大值。

Abstract:

The Zr70Al8Cu22-xNix（x=8.5,9,9.5,10,10.5,11）bulk amorphous alloy rods with 2mm diameters were prepared by copper mold casting technique,and the effect of Ni/Cu content ratio on thermal stability and mechanical properties of Zr-based amorphous alloys were investigated by differential scanning calorimeter（DSC）and uniaxial compression test methods.The results show that the value of supercooled liquid regionΔTx change from 80K to 81Kwith the Ni/Cu content ratio increase,but theΔTx have a bigger value than other alloys when Ni/Cu content ratio arrive 0.63 and 0.76,when Ni/Cu content ratio arrive 0.76,which has a better thermal stability because of itsΔTx value is 89K.And the plastic strain exhabit a downward tend with the Ni/Cu content ratio increase,but there exists a unnormal larger value when Ni/Cu content ratio arrive 0.76,which has good plastic strain,and the compressive strength has a downward tend over all with wave and changeless nature.And the young modulus value arrives the maximum value 80 GPa when Ni/Cu content ratio is 0.63,but other alloys change from 58 GPa to 65 GPa.In totally, the plastic strain,compressive strength and young modulus also arrive the maximum value when Ni/Cu content ratio is 0.63.