(華中科技大學(xué) 材料成形及模具技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，武漢 430074)
摘 要: 在非真空熔煉條件下采用工業(yè)純?cè)牧虾拓?fù)壓銅模吸鑄法制備Mg65Cu25Y10−xNdx(x=0, 2, 4, 6, 8, 10)棒狀試樣，利用差示掃描量熱(DSC)和X射線衍射(XRD)等方法分析Nd對(duì)Mg-Cu-Y-Nd非晶合金玻璃形成能力的影響。結(jié)果表明：Nd的含量(x)為0, 4, 6成分的合金試樣具有完全非晶態(tài)組織,且x=4時(shí)具有最大的玻璃形成能力，其約化玻璃轉(zhuǎn)變溫度(Trg)為0.592，過(guò)冷液相區(qū)寬度(ΔTx)高達(dá)66 K；當(dāng)x為2, 8, 10時(shí)，由于合金成分明顯偏離共晶成分，玻璃形成能力降低，試樣只含有少量非晶，且主要呈晶體組織特征。
關(guān)鍵字: 非晶合金；鎂合金；塊體金屬玻璃；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
