(1. 沈陽工業(yè)大學 材料科學與工程學院，沈陽 110870；
2. 沈陽化工大學 材料科學與工程學院，沈陽 110142；
3. 中國科學院 金屬研究所 沈陽材料科學國家(聯(lián)合)實驗室，沈陽 110016)
摘 要: 采用銅模鑄造法，制備了直徑為2 mm的Zr50.5-xAl9Ni4.05Cu36.45Nbx(x=0，1，2，4，摩爾分數(shù)，%)完全非晶棒材。分別采用X射線衍射儀(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)、差示掃描量熱計(DSC)和力學性能試驗機對合金的相組成、結(jié)構(gòu)、熱物性參數(shù)和力學性能進行研究。結(jié)果表明：添加Nb對所研究合金的玻璃轉(zhuǎn)變溫度Tg影響不大，但提高了晶化溫度Tx和過冷液相區(qū)ΔTx；當x=4時，合金具有最高的玻璃轉(zhuǎn)變溫度Tx=773.4 K和最大過冷液相區(qū)ΔTx=68.1 K。依據(jù)耐溫和熱塑性成形要求，非晶合金的熱穩(wěn)定性可用玻璃轉(zhuǎn)變溫度Tx和過冷液相區(qū)ΔTx來分別表示。隨著合金中Nb添加量的增加，非晶合金的雙重熱穩(wěn)定性提高。非晶合金的斷裂強度隨著Nb添加量的增加先減小后增加，當x=4時，合金的最高斷裂強度為2032 MPa。
關(guān)鍵字: Zr50.5-xAl9Ni4.05Cu36.45Nbx；非晶合金；Nb添加；熱穩(wěn)定性；力學性能
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;
3. Shenyang National Laboratory for Material Science, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Zr50.5-xAl9Ni4.05Cu36.45Nbx(x=0, 1, 2, 4, mole fraction, %) amorphous alloy bar with 2 mm in diameter were fabricated by copper mold casting method. The phase constitution, microstructure, thermal property and mechanical properties of alloys were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and electronic testing machine. The results show that the effect of Nb addition on the glass transition temperature Tg of the alloys is slight. However, the crystallization temperature Tx and supercooled liquid region ΔTx of the alloy obviously increase with increasing the Nb addition. When x is 4, the alloy has the highest glass crystallization temperature (Tx=773.4 K) and largest supercooled liquid region (ΔTx=68.1 K). According to the demand of heat tolerance and thermoplasticity shaping, the thermal stability of amorphous alloy can be represented by Tx and ΔTx, respectively. And for this investigated system, the thermal stability of amorphous alloy can be enhanced by increasing the Nb content. The fracture strength decreases first and then increases with increasing the Nb content, and the fracture strength reaches the highest value of 2032 MPa while x is 4.
Key words: Zr50.5-xAl9Ni4.05Cu36.45Nbx; amorphous alloy; Nb addition; thermal stability; mechanical property
