混合稀土基大块非晶合金的制备及力学性能  

Preparation and Mechanical Property of Mischmetal-based Bulk Metallic Glass

作　　者：武晓峰[1] 何冰[2] 赵威[1] 邱克强[1] 

机构地区：[1]辽宁工学院材料与化学工程学院,辽宁锦州121001 [2]辽宁工学院机械工程与自动化学院,辽宁锦州121001

出　　处：《辽宁工学院学报》2006年第5期322-325,350,共5页Journal of Liaoning Institute of Technology(Natural Science Edition)

基　　金：辽宁省自然科学基金资助项目(20032137)

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.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 ATx （〉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.

关 键 词：大块非品合金 混合稀土 形成能力 热稳定性 力学性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]