微量氮元素添加对Zr基非晶合金力学性能影响的研究

Effect of Trace Nitrogen Element Addition on Mechanical Properties of Zr-Based Amorphous Alloys

摘要:

采用铜模吸铸法，成功地制备了直径3 mm的(Zr₅₅Cu₃₀Al₁₀Ni₅)_100-xN_x(x=0、0.5、1.0、1.5、2.0)非晶合金棒材。利用氮氧分析仪、X射线衍射仪、差示扫描量热仪、万能试验机、显微硬度计和扫描电镜等手段，系统地研究了氮含量对(Zr₅₅Cu₃₀Al₁₀Ni₅)_100-xN_x非晶合金的力学性能的影响。同时，对氮元素添加时非晶合金体系的剪切带与断口形貌进行了分析讨论。结果表明：不同氮含量的(Zr₅₅Cu₃₀Al₁₀Ni₅)_100-xN_x合金中，氮含量（原子百分数）分别为0.08%、0.49%、1.18%、1.48%、1.73%；在添加微量氮元素前后，块体合金(Zr₅₅Cu₃₀Al₁₀Ni₅)_100-xN_x均呈现完全非晶结构；原始Zr₅₅Cu₃₀Al₁₀Ni₅非晶合金的显微硬度值为478.62 HV，添加氮元素后显微硬度随氮含量增加而递增，显微硬度最高为519.16 HV；添加氮元素前，Zr₅₅Cu₃₀Al₁₀Ni₅合金的抗压强度为1 738 MPa、塑性形变量为2.1%；当x=0.5时，抗压强度降至1 719 MPa、塑性形变量降至1.0%；当x≥1.0时，抗压强度持续下降且塑性较差。

Abstract:

Φ3 mm （Zr₅₅Cu₃₀Al₁₀Ni₅）_100-xN_x （x=0， 0.5， 1.0， 1.5， 2.0 at%） metal glass bars were prepared by copper mold suction casting method. The effect of N element addition on the mechanical properties of （Zr₅₅Cu₃₀Al₁₀Ni₅）_100-xN_x alloys was investigated by nitrogen and oxygen analyzer， X-ray diffractometer， differential scanning calorimeter universal testing machine， microhardness tester and scanning electron microscope. The results showed that the nitrogen content of （Zr₅₅Cu₃₀Al₁₀Ni₅）_100-xN_x alloys with different nitrogen content were measured as 0.08， 0.49， 1.18， 1.48， 1.73 at%， respectively. The bulk （Zr₅₅Cu₃₀Al₁₀Ni₅）_100-xN_x alloys were completely amorphous before and after adding trace N element. The microhardness of Zr₅₅Cu₃₀Al₁₀Ni₅ amorphous alloy was 478.62 HV. When nitrogen was added， the microhardness increased with increasing nitrogen content. When nitrogen content was 2%， the microhardness was 519.16 HV. The compressive strength of Zr₅₅Cu₃₀Al₁₀Ni₅ alloy was 1 738 MPa and the plastic deformation was 2.1% without nitrogen addition. When nitrogen was added to 0.5%， the compressive strength decreased to 1 719 MPa and the plastic deformation decreased to 1.0%. When the nitrogen content was greater than 1.0 at%， the strength continued to decrease with plasticity. In addition， the shear band and fracture morphology of the amorphous alloy system with nitrogen were analyzed and discussed.