Effect of Trace Nitrogen Element Addition on Mechanical Properties of Zr-Based Amorphous Alloys
Φ3 mm(Zr55Cu30Al10Ni5)100-xNx(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-xNx 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-xNx alloys with different nitrogen content were measured as 0.08,0.49,1.18,1.48,1.73 at%,respectively.The bulk(Zr55Cu30Al10Ni5)100-xNx 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.
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