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(Cu50Zr50)92Al8塊體非晶合金高溫塑性變形過程中的晶化行為
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國家自然科學基金 (10972190)；湖南省自然科學基金 (09JJ0386)；湘潭大學科研項目 (08XZX10)


Crystallization Behavior of (Cu50Zr50)92Al8 Bulk Metallic Glass During the High Temperature Plastic Deformation
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    摘要:

    采用水冷銅模吸鑄法制備直徑2 mm的 (Cu50Zr50)92Al8塊體非晶合金。利用X射線衍射 (XRD)、差示掃描量熱分析儀 (DSC) 對該非晶合金的結構及熱力學參數(shù)進行表征。利用萬能試驗機在過冷液相區(qū)內對該非晶合金進行壓縮變形，研究變形量 (20%，60%和80%) 對非晶合金顯微結構和熱穩(wěn)定性的影響。結果表明，塑性變形使得該非晶合金的熱穩(wěn)定性降低，并導致其部分晶化，其晶化程度取決于合金的變形量的大小，當變形量為80%時，該合金的XRD圖譜中出現(xiàn)了明顯的晶化峰。晶化相的析出使得變形后的非晶合金的顯微硬度有明顯提高

    Abstract:

    The rod of the (Cu50Zr50)92Al8 (at%) bulk metallic glass(BMG) with a diameter of 2 mm was prepared by water-cooled copper mould sucking method, and its amorphous feature of the as-cast alloy was characterized by X-ray diffraction (XRD). The thermodynamic parameters of the bulk metallic glass were determined by differential scanning calorimeter (DSC). The alloy was compressed to different strains(20%, 60% and 80%) in the super-cooled liquid region, and the effects of the plastic strains on the microstructure and the thermal stability of the alloy were investigated. It is found that the deformation reduces the thermal stability of the alloy, and a partial crystallization occurs during the deformation in the alloy. The extent of the crystallization is strongly dependent on the deformation strain, and as the strain increases to 80%, the peaks of the crystallites can be clearly observed on the XRD pattern of the alloy. The present of the crystallites increase the mico-hardness of the alloy

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田延豹,馬 驀,羅致春,萬小軍,林建國.(Cu50Zr50)92Al8塊體非晶合金高溫塑性變形過程中的晶化行為[J].稀有金屬材料與工程,2012,41(4):658~662.[Tian Yanbao, Ma Mo, Luo Zhichun, Wan Xiaojun, Lin Jianguo. Crystallization Behavior of (Cu50Zr50)92Al8 Bulk Metallic Glass During the High Temperature Plastic Deformation[J]. Rare Metal Materials and Engineering,2012,41(4):658~662.]
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  • 收稿日期:2011-04-08
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