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RE microalloying of copper-based amorphous alloy forming ability
Time:06/10/2011

  RE microalloying of copper-based amorphous alloy forming ability

  Bulk amorphous alloys as well by the physical and chemical properties of materials scientists attention. Micro-alloying technology as an important means to improve the material performance in the field of amorphous alloys also play an important role. In this paper, Cu-Zr-Al bulk amorphous alloys based on rare earth microalloying through the design of alloy composition, using X-ray diffraction analysis (XRD), differential scanning calorimetry analysis (DSC), differential thermal analysis (DTA) and electrochemical polarization curves of rare earth alloy micro-alloying on the structure of glass forming ability, thermal stability and corrosion of the line.

  This selection has large glass forming ability of Cu_ (50) Zr_ (45) Al_5 as a basis for alloy, rare earth Y, Ce, Sm, La Add as micro-alloying elements, were prepared by copper mold suction casting a composition (Cu_ ( 50) Zr_ (45) Al_5) 100-xREx the alloy samples. Using XRD and optical microscopy conducted on the organizational structure of alloy sample analysis, the results showed that the rare earth added, the alloy is completely amorphous, with the rare earth content increased, the amorphous alloy is no longer fully have Cu10Zr7, CuZr and Zr2Cu Precipitation.
 
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  Study by differential thermal analysis of trace rare earth elements on the Cu-based amorphous alloy glass forming ability and thermal stability. Rare earth elements have similar atomic radius and the physical and chemical properties, their phase alloy with the parent element of each group with a large atomic size ratio, the negative mixing enthalpy, the addition of rare earth elements can improve Cu-Zr-Al Alloys Glass forming ability and thermal stability. The results show that when Y, Sm, La ≤ 2 at.%, The alloy samples of Trg in between 0.595 to 0.615, γ between the .402 to .410, Tx between the 55K to 66K, with a larger glass forming ability and thermal stability. When the REE content of more than 2 at.%, The amorphous alloys on the glass forming ability and thermal stability are no longer an active role. The addition of trace Ce reduces the thermal stability, but the glass forming ability of the alloy has little effect.

  Amorphous alloys due to the special atomic structure, has good corrosion resistance. Based on the design of Cu-Zr-Al-RE Alloys sample in 3.5% NaCl solution in the electrochemical experiments showed that the corrosion potential of alloy Ec-480mV to-535mV in between the corrosion current density ic in 6μA / cm2 to 20μA/cm2 between. Ec alloy corrosion potential decreased with the addition of Y, when Y = 3 at.%, Reaching the lowest-533mV, Y ic adding little effect on the alloy. With the increase of Ce content in the alloy ic gradually increases, while the Ce ≤ 3 at%, the alloy is lower than the base alloy ic Cu_ (50) Zr_ (45) Al_5 (Ec =- 487mV, ic = 16.8μA / cm2) , Ce content of more than 3 at% the corrosion resistance of the alloy began to decrease, trace the corrosion potential of the alloy Ce has little effect; trace Sm and La have reduced the corrosion current density of the alloy ic, the corrosion potential of the alloy Ec little effect.

  With the composition Zr55Cu30Al10Ni5 (Ec =- 500mV, ic = 12.6nA/cm2) Comparison of amorphous alloys found that the addition of rare earth elements on the Cu-based amorphous alloy is not significantly improved corrosion resistance, indicating that the Cu-based amorphous alloy, the structure does not affect the corrosion resistance of the most important reason, alloy composition and content of each component is also an important factor of corrosion. Cu-Zr-Al-RE amorphous alloys, Department of Cl-with good resistance to pitting corrosion, when the alloy is completely amorphous, the occurrence of corrosion, when the alloy is not completely amorphous, the alloy localized corrosion.