Zr-Al-Co-Er-Cu系块体非晶合金的形成及其力学性能和腐蚀行为

Formation, Mechanical Properties and Corrosion Behavior of Zr-Al-Co-Er-Cu Bulk Metallic Glasses

制备了具有高非晶形成能力的Zr-Al-Co-Er-Cu系非晶块体合金,并研究了Cu元素对Zr-Al-Co-Er块体非晶合金的形成、力学性能和腐蚀行为的影响。研究表明以适量的Cu元素替代Zr-Al-Co-Er合金的Co元素有利于非晶形成能力的提高和力学性能的改善。其中,Zr49Al20Co23Er6Cu2非晶合金的临界直径达6mm,压缩断裂强度达到1950MPa,表现出1.4%的塑性变形。Zr49Al20Co25-xEr6Cux(x=0～8at%)非晶合金在1mol/LH2SO4、3%NaCl(质量分数,下同)溶液中的均发生自钝化,并且具有较低的钝化电流密度。Cu含量的变化对Zr-Al-Co-Er-Cu非晶合金的腐蚀行为没有明显影响。

Zr-Al-Co-Er-Cu bulk metallic glasses with high glass-forming ability were synthesized by copper mold casting, and the effects of Cu addition on the formation, mechanical properties and corrosion behavior of bulk glassy Zr-Al-Co-Er alloys were investigated. Replacing of a portion of Co by Cu is effective on improving the glass-forming ability and mechanical properties of the bulk glassy Zr-Al-Co-Er alloys. The bulk glassy Zr49Al20Co23Er6Cu2 alloy exhibits critical diameter of 6 mm, compressive fracture strength of 1950 MPa and plastic strain of 1.4%. Bulk glassy Zr49Al20Co25-xEr6Cux （x=0～8 at%） alloys were spontaneously passivated with low passive current densities in 1 mol/L H2SO4 and 3wt% NaCl solutions. No remarkable changes in corrosion behavior with the variation of Cu content for the bulk glassy Zr-Al-Co-Er-Cu alloys were observed.