Nd对块体Mg-Cu-Y-Nd非晶合金玻璃形成能力的影响

Effect of Nd on glass forming ability of bulk amorphous M g-Cu-Y-Nd alloys

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。

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 △Tx 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.