微量元素对Cu-Zr-Al系非晶合金性能的影响

Influence of micro-composition on the performance of Cu-Zr-Al bulk amorphous alloy

通过对直径为3mm成分为Cu50Zr43Al7、(Cu50Zr43Al7)100-xYx(x=2,5)、(Cu50Zr43Al7)100-xAgx(x=6,7)的非晶合金进行X射线衍射(XRD)和差分扫描量热(DSC)的测试分析,研究了微量元素Ag、Y对Cu50Zr43Al7块状非晶的玻璃形成能力和热稳定性的影响。结果表明,添加适当微量的Ag和Y元素,提高了合金的热稳定性和玻璃形成能力,但Ag元素比Y元素的作用要更加显著。利用动电位极化法对各非晶合金在3.5%NaCl溶液中的电化学测试表明,各非晶合金的耐腐蚀性均远远好于相应的晶态合金。添加了微量的Ag、Y元素提高了Cu50Zr43Al7非晶合金的耐蚀性能,Cu43Zr43Al7Ag7非晶合金的腐蚀电流密度比Cu50Zr43Al7的降低了1～2个数量级。

The influence of adding Ag and Y to Cu50Zr43Al7 amorphous alloy on glass formation ability（GFA） and thermal stability was studied by X-ray diffraction（XRD）and differential scanning calorimetry（DSC）.The results show that Ag and Y appropriate micro-addition can enhance the GFA and thermal stability of the Cu-ZrAl amorphous alloy.The effect of Ag is better than that of Y.The electrochemical corrosion behaviors of Cu50 Zr43Al7,（Cu50Zr43Al7）100-xYx（x=2,5） and（Cu50Zr43Al7）100-xAgx（x=6,7）amorphous alloys in 3.5% NaCl solution were investigated by potentiodynamic polarization method.It is found that corrosion resistance of all amorphous alloys is better than that of the corresponding crystalline alloys.Ag and Y micro-addition can improve corrosion resistance of Cu50Zr43Al7 amorphous alloy.The corrosion current density of Cu43Zr43Al7Ag7 amorphous alloy decreases 1-2orders of magnitude comparing with that of Cu50Zr43Al7.