25%）和高的屈服強(qiáng)度 (>1.6 GPa)。低的STZs勢(shì)能和高的剪切帶擴(kuò)展抗力是異質(zhì)結(jié)構(gòu)Zr基塊體非晶合金塑性提高的主要原因。"/>

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異質(zhì)結(jié)構(gòu)Zr基非晶合金的熱穩(wěn)定性及力學(xué)性能
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國(guó)家自然科學(xué)基金（50701001）；安徽省自然科學(xué)基金重點(diǎn)項(xiàng)目（KJ2010A052）


Thermal Stability and Mechanical Properties of Zr-Based Amorphous Alloys with Heterogeneous Structures
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    摘要:

    通過(guò)銅模鑄造法制備了具有異質(zhì)結(jié)構(gòu)的Zr64.2Ni16.2Cu14.6Al5和Zr63.4Ni16.2Cu15.4Al5塊體非晶合金，利用X射線衍射（XRD）、高分辨透射電鏡（HRTEM）和差示掃描量熱法（DSC）研究了其微觀結(jié)構(gòu)及熱穩(wěn)定性。結(jié)果表明，與均勻結(jié)構(gòu)的Zr65Al10Ni10Cu15塊體非晶合金相比，異質(zhì)結(jié)構(gòu)降低了材料的熱穩(wěn)定性。在單軸壓縮試驗(yàn)中，兩種Zr基塊體非晶合金具有大的塑性應(yīng)變（>25%）和高的屈服強(qiáng)度 (>1.6 GPa)。低的STZs勢(shì)能和高的剪切帶擴(kuò)展抗力是異質(zhì)結(jié)構(gòu)Zr基塊體非晶合金塑性提高的主要原因。

    Abstract:

    The Zr64.2Ni16.2Cu14.6Al5 and Zr63.4Ni16.2Cu15.4Al5 bulk amorphous alloys with heterogeneous structures were prepared through copper mould casting. The microstructures and thermal stabilities of two Zr-based bulk amorphous alloys were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Compared with homogenous structure Zr65A10lNi10Cu15 bulk amorphous alloys, heterogeneous structure decreases alloy thermal stability. The two Zr-based bulk amorphous alloys exhibit large plastic strain (>25%) and high yield strength (>1.6 GPa) under uniaxial compression tests. The low potential-energy barrier of shear transition zones (STZs) and the high resistance of the shear bands propagation are regarded as the main reason of increasing of plasticity in the bulk amorphous alloy with heterostructure.

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楊 超,李維火.異質(zhì)結(jié)構(gòu)Zr基非晶合金的熱穩(wěn)定性及力學(xué)性能[J].稀有金屬材料與工程,2012,41(7):1196~1022.[Yang Chao, Li Weihuo. Thermal Stability and Mechanical Properties of Zr-Based Amorphous Alloys with Heterogeneous Structures[J]. Rare Metal Materials and Engineering,2012,41(7):1196~1022.]
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  • 收稿日期:2011-07-27
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