Fabrication Of Ce Addition Zr-based Amorphous Alloys And Research On Their Properties

Zr-based amorphous alloys have great application prospect s due to their excellent physical and chemical properties. It is significant to further improve their comprehensive properties for promoting their application. The influences of Ce addition on thermal stability, mechanical properties, corrosion resistance and wear resistance of the amorphous alloys were investigated.The(Zr55Al10Ni5Cu30)100-xCex(x=0~4, at.%) alloys were fabricated by copper mold casting method. The microstructures of the alloys were examined through X-ray diffraction(XRD), and the results show that all of the alloys are fully amorphous.The thermal stabilities of the(Zr55Al10Ni5Cu30)100-x Cex(x=0~4, at.%) amorphous alloys were analyzed by differential scanning calorimetry(DSC). The DSC curves reflect that the supercooled liquid region ?Tx of the amorphous alloy decreases with the increasing of Ce addition. This indicates a decrease of thermal stability of amorphous alloy for the addition of Ce. Besides, the crystallization behaviors of the amorphous alloys are affected by the addition of Ce, which makes the crystallization from one step turn to two or more steps.The microhardness of the(Zr55Al10Ni5Cu30)100-x Cex(x=0~4, at.%) amorphous alloys was tested by Vickers hardness tester. The results show that the microhardness of the amorphous alloys decreases slightly with the increasing of Ce content. The compressive mechanical properties of the(Zr55Al10Ni5Cu30)100-x Cex(x=0~4, at.%) amorphous alloys were examined by universal materials tester. The results demonstrate that the compressive strength, max elastic strain, elasticity modulus and plasticity of the amorphous alloys all get down with Ce addition.The corrosion behaviors of the(Zr55Al10Ni5Cu30)100-x Cex(x=0~4, at.%) amorphous alloys in 3.5wt.% NaCl, 1mol/L NaOH and 1mol/L HC l solutions were investigated through immersion tests and electrochemical corrosion tests. The surface appearances of the samples after corrosion were observed by scanning electron microscopy(SEM). The results show that the amorphous alloys containing proper content of Ce present higher corrosion potentials, lower corrosion rates and bigger remaining surface. These indicate proper content of Ce can e nhance the corrosion resistance of amorphous alloys. In 3.5wt.% NaC l and 1mol/L NaOH solutions, the optimum addition content of Ce is 1at.%. In 3.5wt.% NaC l and 1mol/L HC l solutions, the amorphous alloys with Ce addition show less passivation than that wit hout Ce. Moreover, the more Ce addition content is, the less passivation will be found. However, opposite phenomena were observed in 1mol/L NaOH solutions.Friction and wear properties of the(Zr55Al10Ni5Cu30)100-x Cex(x=0~4, at.%) amorphous alloys were tested by tribometer with the type of UMT-3. The abrasion loss of Ce addition amorphous alloy is higher than that alloy without Ce, indicating wear resistance of amorphous alloys decrease s with Ce addition. The SEM pictures of the samples after friction tests show that the forms of wear failure for(Zr55Al10Ni5Cu30)100-xCex(x=0~4, at.%) amorphous alloys are cracks and furrow.