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高強高韌Mg60Cu16Ni10Nd14塊體非晶合金的研究
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遼寧省自然科學基金（20052041）；國家“973”計劃（2007CB613900）


Study on Mg60Cu16Ni10Nd14 Bulk Amorphous Alloy with High Strength and Good Plasticity
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    摘要:

    采用銅模鑄造法制備了直徑為5 mm的Mg60Cu16Ni10Nd14塊體非晶合金，利用掃描電鏡（SEM）、透射電鏡（TEM）X射線衍射 (XRD)和差示掃描量熱儀 (DSC)研究了其組織、相結(jié)構(gòu)和熱穩(wěn)定性。結(jié)果表明：合金為完全的非晶結(jié)構(gòu)，且出現(xiàn)了相分離；玻璃轉(zhuǎn)變溫度Tg、晶化溫度Tx分別為431和488 K，過冷液相區(qū)?Tx為57 K，表明該合金具有較大的玻璃形成能力。壓縮試驗表明：合金的壓縮斷裂強度為653 MPa，斷口出現(xiàn)的大量韌窩是合金塑性變形量達到2.5%的主要原因。

    Abstract:

    Mg60Cu16Ni10Nd14 bulk amorphous alloy with a diameter of 5 mm was prepared by copper mould casting. Its microstructure, phase structure and thermal stability were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that the alloy is completely composed of amorphous phase, and phase-separated regions are homogeneously distributed in the as-cast sample. The glass transition temperature Tg and the crystallization temperature Tx of the alloy are 431 and 488 K, respectively, and the temperature interval of the supercooled liquid region ?Tx is 57 K, which means the quaternary amorphous alloy has great glass forming ability. The compressive test shows that the fracture strength of 653 MPa and the plastic elongation of 2.5% are obtained. The good plasticity is because of lots of dimples on fracture surface.

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王毅堅,索忠源,邱克強.高強高韌Mg60Cu16Ni10Nd14塊體非晶合金的研究[J].稀有金屬材料與工程,2012,41(1):96~99.[Wang Yijian, Suo Zhongyuan, Qiu Keqiang. Study on Mg60Cu16Ni10Nd14 Bulk Amorphous Alloy with High Strength and Good Plasticity[J]. Rare Metal Materials and Engineering,2012,41(1):96~99.]
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  • 收稿日期:2011-02-25
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