(华中科技大学 材料成形及模具技术国家重点实验室，武汉 430074)
摘 要: 在非真空熔炼条件下采用工业纯原材料和负压铜模吸铸法制备Mg65Cu25Y10−xNdx(x=0, 2, 4, 6, 8, 10)棒状试样，利用差示扫描量热(DSC)和X射线衍射(XRD)等方法分析Nd对Mg-Cu-Y-Nd非晶合金玻璃形成能力的影响。结果表明：Nd的含量(x)为0, 4, 6成分的合金试样具有完全非晶态组织,且x=4时具有最大的玻璃形成能力，其约化玻璃转变温度(Trg)为0.592，过冷液相区宽度(ΔTx)高达66 K；当x为2, 8, 10时，由于合金成分明显偏离共晶成分，玻璃形成能力降低，试样只含有少量非晶，且主要呈晶体组织特征。
关键字: 非晶合金；镁合金；块体金属玻璃；玻璃形成能力
Mg-Cu-Y-Nd alloys
（State Key Laboratory of Material Processing and Die & Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:The shape samples of Mg65Cu25Y10−xNdx(x=0, 2, 4, 6, 8, 10)were made by copper mold suction casting with commercial raw material under condition of no vacuum melting. By differential scanning calorimetry (DSC) and X-ray diffractometry, the effect of Nd on glass forming ability of Mg-Cu-Y-Nd was analyzed. The results show that the samples with x of 0, 4 and 6 are bulk metallic glass, and the best glass forming ability (GFA) appears at x=4, while the reduced glass transition temperature Trg is 0.592 and the supercooled liquid region ΔTx is 66 K. However, samples with x of 2, 8, 10 obviously deviate from eutectic points, their glass forming ability decrease and the samples mainly consist of crystalline and a few non-crystals.
Key words: amorphous alloy; Mg-based alloy; bulk metallic glass; glass forming ability
