【摘要】 用铜模铸造法成功制备出直径为3 mm以混合稀土金属Mm(Mischmetal)为基的成本较低的Mm55Al25Ni10Cu5Co5大块非晶合金。利用XRD和DSC等手段对该合金的形成能力及热稳定性进行了分析。结果表明,该合金具有很好的非晶形成能力及热稳定性(明显的玻璃转变温度Tg、宽的过冷液相区ΔTx(=Tx-Tg)>60 K及高的约化玻璃转变温度Trg(=Tg/Tm)>0.67).同时,该合金的压缩断裂强度(σf)为676 MPa,比La55 Al25Ni10Cu5Co5大块非晶提高94 MPa.更多还原

【Abstract】 A kind of Mischmetal-based Mm55Al25Ni10Cu5Co5 bulk metallic glass(BMG),in a diameter of 3mm was prepared at low cost by copper mould casting.The glass forming ability and the thermal stability were also investigated by differential scanning calorimetry(DSC)and X-Ray diffraction(XRD).The alloy exhibits distinct glass transition temperature Tg,large supercooled liquid region ΔTx(>60 K) and high value of reduced glass transition temperature Trg(>0.67),indicating that the Mm55Al25Cu10Ni5Co5 alloy is a good glass former.The stress-strain results under compressive condition expatiated that the metallic glass has a superior mechanical property with a compressive fracture strength(σf) 676MPa which is 94 MPa,higher than that of La55Al25Ni10Cu5Co5.更多还原